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/* Machine independent support for SVR4 /proc (process file system) for GDB.

   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2006, 2007, 2008, 2009
   Free Software Foundation, Inc.

   Written by Michael Snyder at Cygnus Solutions.
   Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "elf-bfd.h"		/* for elfcore_write_* */
#include "gdbcmd.h"
#include "gdbthread.h"
#include "regcache.h"
#include "inf-child.h"

#if defined (NEW_PROC_API)
#define _STRUCTURED_PROC 1	/* Should be done by configure script. */
#endif

#include <sys/procfs.h>
#ifdef HAVE_SYS_FAULT_H
#include <sys/fault.h>
#endif
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#include <sys/errno.h>
#include "gdb_wait.h"
#include <signal.h>
#include <ctype.h>
#include "gdb_string.h"
#include "gdb_assert.h"
#include "inflow.h"
#include "auxv.h"

/*
 * PROCFS.C
 *
 * This module provides the interface between GDB and the
 * /proc file system, which is used on many versions of Unix
 * as a means for debuggers to control other processes.
 * Examples of the systems that use this interface are:
 *   Irix
 *   Solaris
 *   OSF
 *   Unixware
 *   AIX5
 *
 * /proc works by imitating a file system: you open a simulated file
 * that represents the process you wish to interact with, and
 * perform operations on that "file" in order to examine or change
 * the state of the other process.
 *
 * The most important thing to know about /proc and this module
 * is that there are two very different interfaces to /proc:
 *   One that uses the ioctl system call, and
 *   another that uses read and write system calls.
 * This module has to support both /proc interfaces.  This means
 * that there are two different ways of doing every basic operation.
 *
 * In order to keep most of the code simple and clean, I have
 * defined an interface "layer" which hides all these system calls.
 * An ifdef (NEW_PROC_API) determines which interface we are using,
 * and most or all occurrances of this ifdef should be confined to
 * this interface layer.
 */


/* Determine which /proc API we are using:
   The ioctl API defines PIOCSTATUS, while
   the read/write (multiple fd) API never does.  */

#ifdef NEW_PROC_API
#include <sys/types.h>
#include "gdb_dirent.h"	/* opendir/readdir, for listing the LWP's */
#endif

#include <fcntl.h>	/* for O_RDONLY */
#include <unistd.h>	/* for "X_OK" */
#include "gdb_stat.h"	/* for struct stat */

/* Note: procfs-utils.h must be included after the above system header
   files, because it redefines various system calls using macros.
   This may be incompatible with the prototype declarations.  */

#include "proc-utils.h"

/* Prototypes for supply_gregset etc. */
#include "gregset.h"

/* =================== TARGET_OPS "MODULE" =================== */

/*
 * This module defines the GDB target vector and its methods.
 */

static void procfs_attach (struct target_ops *, char *, int);
static void procfs_detach (struct target_ops *, char *, int);
static void procfs_resume (struct target_ops *,
			   ptid_t, int, enum target_signal);
static void procfs_stop (ptid_t);
static void procfs_files_info (struct target_ops *);
static void procfs_fetch_registers (struct target_ops *,
				    struct regcache *, int);
static void procfs_store_registers (struct target_ops *,
				    struct regcache *, int);
static void procfs_notice_signals (ptid_t);
static void procfs_kill_inferior (void);
static void procfs_mourn_inferior (struct target_ops *ops);
static void procfs_create_inferior (struct target_ops *, char *, 
				    char *, char **, int);
static ptid_t procfs_wait (struct target_ops *,
			   ptid_t, struct target_waitstatus *);
static int procfs_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
			       struct mem_attrib *attrib,
			       struct target_ops *);
static LONGEST procfs_xfer_partial (struct target_ops *ops,
				    enum target_object object,
				    const char *annex,
				    gdb_byte *readbuf, const gdb_byte *writebuf,
				    ULONGEST offset, LONGEST len);

static int procfs_thread_alive (struct target_ops *ops, ptid_t);

void procfs_find_new_threads (struct target_ops *ops);
char *procfs_pid_to_str (struct target_ops *, ptid_t);

static int proc_find_memory_regions (int (*) (CORE_ADDR,
					      unsigned long,
					      int, int, int,
					      void *),
				     void *);

static char * procfs_make_note_section (bfd *, int *);

static int procfs_can_use_hw_breakpoint (int, int, int);

#if defined (PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
/* When GDB is built as 64-bit application on Solaris, the auxv data is
   presented in 64-bit format.  We need to provide a custom parser to handle 
   that.  */
static int
procfs_auxv_parse (struct target_ops *ops, gdb_byte **readptr,
                  gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
{
  gdb_byte *ptr = *readptr;

  if (endptr == ptr)
    return 0;
  
  if (endptr - ptr < 8 * 2)
    return -1;

  *typep = extract_unsigned_integer (ptr, 4);
  ptr += 8;
  /* The size of data is always 64-bit.  If the application is 32-bit,
     it will be zero extended, as expected.  */
  *valp = extract_unsigned_integer (ptr, 8);
  ptr += 8;

  *readptr = ptr;
  return 1;
}
#endif

static struct target_ops *
procfs_target (void)
{
  struct target_ops *t = inf_child_target ();

  t->to_shortname           = "procfs";
  t->to_longname            = "Unix /proc child process";
  t->to_doc                 =
    "Unix /proc child process (started by the \"run\" command).";
  t->to_create_inferior     = procfs_create_inferior;
  t->to_kill                = procfs_kill_inferior;
  t->to_mourn_inferior      = procfs_mourn_inferior;
  t->to_attach              = procfs_attach;
  t->to_detach              = procfs_detach;
  t->to_wait                = procfs_wait;
  t->to_resume              = procfs_resume;
  t->to_fetch_registers     = procfs_fetch_registers;
  t->to_store_registers     = procfs_store_registers;
  t->to_xfer_partial        = procfs_xfer_partial;
  t->deprecated_xfer_memory = procfs_xfer_memory;
  t->to_notice_signals      = procfs_notice_signals;
  t->to_files_info          = procfs_files_info;
  t->to_stop                = procfs_stop;

  t->to_find_new_threads    = procfs_find_new_threads;
  t->to_thread_alive        = procfs_thread_alive;
  t->to_pid_to_str          = procfs_pid_to_str;

  t->to_has_thread_control  = tc_schedlock;
  t->to_find_memory_regions = proc_find_memory_regions;
  t->to_make_corefile_notes = procfs_make_note_section;
  t->to_can_use_hw_breakpoint = procfs_can_use_hw_breakpoint;

#if defined(PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)
  t->to_auxv_parse = procfs_auxv_parse;
#endif

  t->to_magic               = OPS_MAGIC;

  return t;
}

/* =================== END, TARGET_OPS "MODULE" =================== */

/*
 * World Unification:
 *
 * Put any typedefs, defines etc. here that are required for
 * the unification of code that handles different versions of /proc.
 */

#ifdef NEW_PROC_API		/* Solaris 7 && 8 method for watchpoints */
#ifdef WA_READ
     enum { READ_WATCHFLAG  = WA_READ,
	    WRITE_WATCHFLAG = WA_WRITE,
	    EXEC_WATCHFLAG  = WA_EXEC,
	    AFTER_WATCHFLAG = WA_TRAPAFTER
     };
#endif
#else				/* Irix method for watchpoints */
     enum { READ_WATCHFLAG  = MA_READ,
	    WRITE_WATCHFLAG = MA_WRITE,
	    EXEC_WATCHFLAG  = MA_EXEC,
	    AFTER_WATCHFLAG = 0		/* trapafter not implemented */
     };
#endif

/* gdb_sigset_t */
#ifdef HAVE_PR_SIGSET_T
typedef pr_sigset_t gdb_sigset_t;
#else
typedef sigset_t gdb_sigset_t;
#endif

/* sigaction */
#ifdef HAVE_PR_SIGACTION64_T
typedef pr_sigaction64_t gdb_sigaction_t;
#else
typedef struct sigaction gdb_sigaction_t;
#endif

/* siginfo */
#ifdef HAVE_PR_SIGINFO64_T
typedef pr_siginfo64_t gdb_siginfo_t;
#else
typedef struct siginfo gdb_siginfo_t;
#endif

/* gdb_premptysysset */
#ifdef premptysysset
#define gdb_premptysysset premptysysset
#else
#define gdb_premptysysset premptyset
#endif

/* praddsysset */
#ifdef praddsysset
#define gdb_praddsysset praddsysset
#else
#define gdb_praddsysset praddset
#endif

/* prdelsysset */
#ifdef prdelsysset
#define gdb_prdelsysset prdelsysset
#else
#define gdb_prdelsysset prdelset
#endif

/* prissyssetmember */
#ifdef prissyssetmember
#define gdb_pr_issyssetmember prissyssetmember
#else
#define gdb_pr_issyssetmember prismember
#endif

/* As a feature test, saying ``#if HAVE_PRSYSENT_T'' everywhere isn't
   as intuitively descriptive as it could be, so we'll define
   DYNAMIC_SYSCALLS to mean the same thing.  Anyway, at the time of
   this writing, this feature is only found on AIX5 systems and
   basically means that the set of syscalls is not fixed.  I.e,
   there's no nice table that one can #include to get all of the
   syscall numbers.  Instead, they're stored in /proc/PID/sysent
   for each process.  We are at least guaranteed that they won't
   change over the lifetime of the process.  But each process could
   (in theory) have different syscall numbers.
*/
#ifdef HAVE_PRSYSENT_T
#define DYNAMIC_SYSCALLS
#endif



/* =================== STRUCT PROCINFO "MODULE" =================== */

     /* FIXME: this comment will soon be out of date W.R.T. threads.  */

/* The procinfo struct is a wrapper to hold all the state information
   concerning a /proc process.  There should be exactly one procinfo
   for each process, and since GDB currently can debug only one
   process at a time, that means there should be only one procinfo.
   All of the LWP's of a process can be accessed indirectly thru the
   single process procinfo.

   However, against the day when GDB may debug more than one process,
   this data structure is kept in a list (which for now will hold no
   more than one member), and many functions will have a pointer to a
   procinfo as an argument.

   There will be a separate procinfo structure for use by the (not yet
   implemented) "info proc" command, so that we can print useful
   information about any random process without interfering with the
   inferior's procinfo information. */

#ifdef NEW_PROC_API
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
#  define MAIN_PROC_NAME_FMT   "/proc/%d"
#  define CTL_PROC_NAME_FMT    "/proc/%d/ctl"
#  define AS_PROC_NAME_FMT     "/proc/%d/as"
#  define MAP_PROC_NAME_FMT    "/proc/%d/map"
#  define STATUS_PROC_NAME_FMT "/proc/%d/status"
#  define MAX_PROC_NAME_SIZE sizeof("/proc/99999/lwp/8096/lstatus")
# endif
/* the name of the proc status struct depends on the implementation */
typedef pstatus_t   gdb_prstatus_t;
typedef lwpstatus_t gdb_lwpstatus_t;
#else /* ! NEW_PROC_API */
/* format strings for /proc paths */
# ifndef CTL_PROC_NAME_FMT
#  define MAIN_PROC_NAME_FMT   "/proc/%05d"
#  define CTL_PROC_NAME_FMT    "/proc/%05d"
#  define AS_PROC_NAME_FMT     "/proc/%05d"
#  define MAP_PROC_NAME_FMT    "/proc/%05d"
#  define STATUS_PROC_NAME_FMT "/proc/%05d"
#  define MAX_PROC_NAME_SIZE sizeof("/proc/ttttppppp")
# endif
/* the name of the proc status struct depends on the implementation */
typedef prstatus_t gdb_prstatus_t;
typedef prstatus_t gdb_lwpstatus_t;
#endif /* NEW_PROC_API */

typedef struct procinfo {
  struct procinfo *next;
  int pid;			/* Process ID    */
  int tid;			/* Thread/LWP id */

  /* process state */
  int was_stopped;
  int ignore_next_sigstop;

  /* The following four fd fields may be identical, or may contain
     several different fd's, depending on the version of /proc
     (old ioctl or new read/write).  */

  int ctl_fd;			/* File descriptor for /proc control file */
  /*
   * The next three file descriptors are actually only needed in the
   * read/write, multiple-file-descriptor implemenation (NEW_PROC_API).
   * However, to avoid a bunch of #ifdefs in the code, we will use
   * them uniformly by (in the case of the ioctl single-file-descriptor
   * implementation) filling them with copies of the control fd.
   */
  int status_fd;		/* File descriptor for /proc status file */
  int as_fd;			/* File descriptor for /proc as file */

  char pathname[MAX_PROC_NAME_SIZE];	/* Pathname to /proc entry */

  fltset_t saved_fltset;	/* Saved traced hardware fault set */
  gdb_sigset_t saved_sigset;	/* Saved traced signal set */
  gdb_sigset_t saved_sighold;	/* Saved held signal set */
  sysset_t *saved_exitset;	/* Saved traced system call exit set */
  sysset_t *saved_entryset;	/* Saved traced system call entry set */

  gdb_prstatus_t prstatus;	/* Current process status info */

#ifndef NEW_PROC_API
  gdb_fpregset_t fpregset;	/* Current floating point registers */
#endif

#ifdef DYNAMIC_SYSCALLS
  int num_syscalls;		/* Total number of syscalls */
  char **syscall_names;		/* Syscall number to name map */
#endif

  struct procinfo *thread_list;

  int status_valid : 1;
  int gregs_valid  : 1;
  int fpregs_valid : 1;
  int threads_valid: 1;
} procinfo;

static char errmsg[128];	/* shared error msg buffer */

/* Function prototypes for procinfo module: */

static procinfo *find_procinfo_or_die (int pid, int tid);
static procinfo *find_procinfo (int pid, int tid);
static procinfo *create_procinfo (int pid, int tid);
static void destroy_procinfo (procinfo * p);
static void do_destroy_procinfo_cleanup (void *);
static void dead_procinfo (procinfo * p, char *msg, int killp);
static int open_procinfo_files (procinfo * p, int which);
static void close_procinfo_files (procinfo * p);
static int sysset_t_size (procinfo *p);
static sysset_t *sysset_t_alloc (procinfo * pi);
#ifdef DYNAMIC_SYSCALLS
static void load_syscalls (procinfo *pi);
static void free_syscalls (procinfo *pi);
static int find_syscall (procinfo *pi, char *name);
#endif /* DYNAMIC_SYSCALLS */

/* The head of the procinfo list: */
static procinfo * procinfo_list;

/*
 * Function: find_procinfo
 *
 * Search the procinfo list.
 *
 * Returns: pointer to procinfo, or NULL if not found.
 */

static procinfo *
find_procinfo (int pid, int tid)
{
  procinfo *pi;

  for (pi = procinfo_list; pi; pi = pi->next)
    if (pi->pid == pid)
      break;

  if (pi)
    if (tid)
      {
	/* Don't check threads_valid.  If we're updating the
	   thread_list, we want to find whatever threads are already
	   here.  This means that in general it is the caller's
	   responsibility to check threads_valid and update before
	   calling find_procinfo, if the caller wants to find a new
	   thread. */

	for (pi = pi->thread_list; pi; pi = pi->next)
	  if (pi->tid == tid)
	    break;
      }

  return pi;
}

/*
 * Function: find_procinfo_or_die
 *
 * Calls find_procinfo, but errors on failure.
 */

static procinfo *
find_procinfo_or_die (int pid, int tid)
{
  procinfo *pi = find_procinfo (pid, tid);

  if (pi == NULL)
    {
      if (tid)
	error (_("procfs: couldn't find pid %d (kernel thread %d) in procinfo list."),
	       pid, tid);
      else
	error (_("procfs: couldn't find pid %d in procinfo list."), pid);
    }
  return pi;
}

/* open_with_retry() is a wrapper for open().  The appropriate
   open() call is attempted; if unsuccessful, it will be retried as
   many times as needed for the EAGAIN and EINTR conditions.

   For other conditions, open_with_retry() will retry the open() a
   limited number of times.  In addition, a short sleep is imposed
   prior to retrying the open().  The reason for this sleep is to give
   the kernel a chance to catch up and create the file in question in
   the event that GDB "wins" the race to open a file before the kernel
   has created it.  */

static int
open_with_retry (const char *pathname, int flags)
{
  int retries_remaining, status;

  retries_remaining = 2;

  while (1)
    {
      status = open (pathname, flags);

      if (status >= 0 || retries_remaining == 0)
	break;
      else if (errno != EINTR && errno != EAGAIN)
	{
	  retries_remaining--;
	  sleep (1);
	}
    }

  return status;
}

/*
 * Function: open_procinfo_files
 *
 * Open the file descriptor for the process or LWP.
 * ifdef NEW_PROC_API, we only open the control file descriptor;
 * the others are opened lazily as needed.
 * else (if not NEW_PROC_API), there is only one real
 * file descriptor, but we keep multiple copies of it so that
 * the code that uses them does not have to be #ifdef'd.
 *
 * Return: file descriptor, or zero for failure.
 */

enum { FD_CTL, FD_STATUS, FD_AS };

static int
open_procinfo_files (procinfo *pi, int which)
{
#ifdef NEW_PROC_API
  char tmp[MAX_PROC_NAME_SIZE];
#endif
  int  fd;

  /*
   * This function is getting ALMOST long enough to break up into several.
   * Here is some rationale:
   *
   * NEW_PROC_API (Solaris 2.6, Solaris 2.7, Unixware):
   *   There are several file descriptors that may need to be open
   *   for any given process or LWP.  The ones we're intereted in are:
   *     - control	 (ctl)	  write-only	change the state
   *     - status	 (status) read-only	query the state
   *     - address space (as)     read/write	access memory
   *     - map           (map)    read-only     virtual addr map
   *   Most of these are opened lazily as they are needed.
   *   The pathnames for the 'files' for an LWP look slightly
   *   different from those of a first-class process:
   *     Pathnames for a process (<proc-id>):
   *       /proc/<proc-id>/ctl
   *       /proc/<proc-id>/status
   *       /proc/<proc-id>/as
   *       /proc/<proc-id>/map
   *     Pathnames for an LWP (lwp-id):
   *       /proc/<proc-id>/lwp/<lwp-id>/lwpctl
   *       /proc/<proc-id>/lwp/<lwp-id>/lwpstatus
   *   An LWP has no map or address space file descriptor, since
   *   the memory map and address space are shared by all LWPs.
   *
   * Everyone else (Solaris 2.5, Irix, OSF)
   *   There is only one file descriptor for each process or LWP.
   *   For convenience, we copy the same file descriptor into all
   *   three fields of the procinfo struct (ctl_fd, status_fd, and
   *   as_fd, see NEW_PROC_API above) so that code that uses them
   *   doesn't need any #ifdef's.
   *     Pathname for all:
   *       /proc/<proc-id>
   *
   *   Solaris 2.5 LWP's:
   *     Each LWP has an independent file descriptor, but these
   *     are not obtained via the 'open' system call like the rest:
   *     instead, they're obtained thru an ioctl call (PIOCOPENLWP)
   *     to the file descriptor of the parent process.
   *
   *   OSF threads:
   *     These do not even have their own independent file descriptor.
   *     All operations are carried out on the file descriptor of the
   *     parent process.  Therefore we just call open again for each
   *     thread, getting a new handle for the same 'file'.
   */

#ifdef NEW_PROC_API
  /*
   * In this case, there are several different file descriptors that
   * we might be asked to open.  The control file descriptor will be
   * opened early, but the others will be opened lazily as they are
   * needed.
   */

  strcpy (tmp, pi->pathname);
  switch (which) {	/* which file descriptor to open? */
  case FD_CTL:
    if (pi->tid)
      strcat (tmp, "/lwpctl");
    else
      strcat (tmp, "/ctl");
    fd = open_with_retry (tmp, O_WRONLY);
    if (fd <= 0)
      return 0;		/* fail */
    pi->ctl_fd = fd;
    break;
  case FD_AS:
    if (pi->tid)
      return 0;		/* there is no 'as' file descriptor for an lwp */
    strcat (tmp, "/as");
    fd = open_with_retry (tmp, O_RDWR);
    if (fd <= 0)
      return 0;		/* fail */
    pi->as_fd = fd;
    break;
  case FD_STATUS:
    if (pi->tid)
      strcat (tmp, "/lwpstatus");
    else
      strcat (tmp, "/status");
    fd = open_with_retry (tmp, O_RDONLY);
    if (fd <= 0)
      return 0;		/* fail */
    pi->status_fd = fd;
    break;
  default:
    return 0;		/* unknown file descriptor */
  }
#else  /* not NEW_PROC_API */
  /*
   * In this case, there is only one file descriptor for each procinfo
   * (ie. each process or LWP).  In fact, only the file descriptor for
   * the process can actually be opened by an 'open' system call.
   * The ones for the LWPs have to be obtained thru an IOCTL call
   * on the process's file descriptor.
   *
   * For convenience, we copy each procinfo's single file descriptor
   * into all of the fields occupied by the several file descriptors
   * of the NEW_PROC_API implementation.  That way, the code that uses
   * them can be written without ifdefs.
   */


#ifdef PIOCTSTATUS	/* OSF */
  /* Only one FD; just open it. */
  if ((fd = open_with_retry (pi->pathname, O_RDWR)) == 0)
    return 0;
#else			/* Sol 2.5, Irix, other? */
  if (pi->tid == 0)	/* Master procinfo for the process */
    {
      fd = open_with_retry (pi->pathname, O_RDWR);
      if (fd <= 0)
	return 0;	/* fail */
    }
  else			/* LWP thread procinfo */
    {
#ifdef PIOCOPENLWP	/* Sol 2.5, thread/LWP */
      procinfo *process;
      int lwpid = pi->tid;

      /* Find the procinfo for the entire process. */
      if ((process = find_procinfo (pi->pid, 0)) == NULL)
	return 0;	/* fail */

      /* Now obtain the file descriptor for the LWP. */
      if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) <= 0)
	return 0;	/* fail */
#else			/* Irix, other? */
      return 0;		/* Don't know how to open threads */
#endif	/* Sol 2.5 PIOCOPENLWP */
    }
#endif	/* OSF     PIOCTSTATUS */
  pi->ctl_fd = pi->as_fd = pi->status_fd = fd;
#endif	/* NEW_PROC_API */

  return 1;		/* success */
}

/*
 * Function: create_procinfo
 *
 * Allocate a data structure and link it into the procinfo list.
 * (First tries to find a pre-existing one (FIXME: why?)
 *
 * Return: pointer to new procinfo struct.
 */

static procinfo *
create_procinfo (int pid, int tid)
{
  procinfo *pi, *parent = NULL;

  if ((pi = find_procinfo (pid, tid)))
    return pi;			/* Already exists, nothing to do. */

  /* find parent before doing malloc, to save having to cleanup */
  if (tid != 0)
    parent = find_procinfo_or_die (pid, 0);	/* FIXME: should I
						   create it if it
						   doesn't exist yet? */

  pi = (procinfo *) xmalloc (sizeof (procinfo));
  memset (pi, 0, sizeof (procinfo));
  pi->pid = pid;
  pi->tid = tid;

#ifdef DYNAMIC_SYSCALLS
  load_syscalls (pi);
#endif

  pi->saved_entryset = sysset_t_alloc (pi);
  pi->saved_exitset = sysset_t_alloc (pi);

  /* Chain into list.  */
  if (tid == 0)
    {
      sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
      pi->next = procinfo_list;
      procinfo_list = pi;
    }
  else
    {
#ifdef NEW_PROC_API
      sprintf (pi->pathname, "/proc/%05d/lwp/%d", pid, tid);
#else
      sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);
#endif
      pi->next = parent->thread_list;
      parent->thread_list = pi;
    }
  return pi;
}

/*
 * Function: close_procinfo_files
 *
 * Close all file descriptors associated with the procinfo
 */

static void
close_procinfo_files (procinfo *pi)
{
  if (pi->ctl_fd > 0)
    close (pi->ctl_fd);
#ifdef NEW_PROC_API
  if (pi->as_fd > 0)
    close (pi->as_fd);
  if (pi->status_fd > 0)
    close (pi->status_fd);
#endif
  pi->ctl_fd = pi->as_fd = pi->status_fd = 0;
}

/*
 * Function: destroy_procinfo
 *
 * Destructor function.  Close, unlink and deallocate the object.
 */

static void
destroy_one_procinfo (procinfo **list, procinfo *pi)
{
  procinfo *ptr;

  /* Step one: unlink the procinfo from its list */
  if (pi == *list)
    *list = pi->next;
  else
    for (ptr = *list; ptr; ptr = ptr->next)
      if (ptr->next == pi)
	{
	  ptr->next =  pi->next;
	  break;
	}

  /* Step two: close any open file descriptors */
  close_procinfo_files (pi);

  /* Step three: free the memory. */
#ifdef DYNAMIC_SYSCALLS
  free_syscalls (pi);
#endif
  xfree (pi->saved_entryset);
  xfree (pi->saved_exitset);
  xfree (pi);
}

static void
destroy_procinfo (procinfo *pi)
{
  procinfo *tmp;

  if (pi->tid != 0)	/* destroy a thread procinfo */
    {
      tmp = find_procinfo (pi->pid, 0);	/* find the parent process */
      destroy_one_procinfo (&tmp->thread_list, pi);
    }
  else			/* destroy a process procinfo and all its threads */
    {
      /* First destroy the children, if any; */
      while (pi->thread_list != NULL)
	destroy_one_procinfo (&pi->thread_list, pi->thread_list);
      /* Then destroy the parent.  Genocide!!!  */
      destroy_one_procinfo (&procinfo_list, pi);
    }
}

static void
do_destroy_procinfo_cleanup (void *pi)
{
  destroy_procinfo (pi);
}

enum { NOKILL, KILL };

/*
 * Function: dead_procinfo
 *
 * To be called on a non_recoverable error for a procinfo.
 * Prints error messages, optionally sends a SIGKILL to the process,
 * then destroys the data structure.
 */

static void
dead_procinfo (procinfo *pi, char *msg, int kill_p)
{
  char procfile[80];

  if (pi->pathname)
    {
      print_sys_errmsg (pi->pathname, errno);
    }
  else
    {
      sprintf (procfile, "process %d", pi->pid);
      print_sys_errmsg (procfile, errno);
    }
  if (kill_p == KILL)
    kill (pi->pid, SIGKILL);

  destroy_procinfo (pi);
  error ("%s", msg);
}

/*
 * Function: sysset_t_size
 *
 * Returns the (complete) size of a sysset_t struct.  Normally, this
 * is just sizeof (syset_t), but in the case of Monterey/64, the actual
 * size of sysset_t isn't known until runtime.
 */

static int
sysset_t_size (procinfo * pi)
{
#ifndef DYNAMIC_SYSCALLS
  return sizeof (sysset_t);
#else
  return sizeof (sysset_t) - sizeof (uint64_t)
    + sizeof (uint64_t) * ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
			   / (8 * sizeof (uint64_t)));
#endif
}

/* Function: sysset_t_alloc

   Allocate and (partially) initialize a sysset_t struct.  */

static sysset_t *
sysset_t_alloc (procinfo * pi)
{
  sysset_t *ret;
  int size = sysset_t_size (pi);
  ret = xmalloc (size);
#ifdef DYNAMIC_SYSCALLS
  ret->pr_size = (pi->num_syscalls + (8 * sizeof (uint64_t) - 1))
                 / (8 * sizeof (uint64_t));
#endif
  return ret;
}

#ifdef DYNAMIC_SYSCALLS

/* Function: load_syscalls

   Extract syscall numbers and names from /proc/<pid>/sysent.  Initialize
   pi->num_syscalls with the number of syscalls and pi->syscall_names
   with the names.  (Certain numbers may be skipped in which case the
   names for these numbers will be left as NULL.) */

#define MAX_SYSCALL_NAME_LENGTH 256
#define MAX_SYSCALLS 65536

static void
load_syscalls (procinfo *pi)
{
  char pathname[MAX_PROC_NAME_SIZE];
  int sysent_fd;
  prsysent_t header;
  prsyscall_t *syscalls;
  int i, size, maxcall;

  pi->num_syscalls = 0;
  pi->syscall_names = 0;

  /* Open the file descriptor for the sysent file */
  sprintf (pathname, "/proc/%d/sysent", pi->pid);
  sysent_fd = open_with_retry (pathname, O_RDONLY);
  if (sysent_fd < 0)
    {
      error (_("load_syscalls: Can't open /proc/%d/sysent"), pi->pid);
    }

  size = sizeof header - sizeof (prsyscall_t);
  if (read (sysent_fd, &header, size) != size)
    {
      error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
    }

  if (header.pr_nsyscalls == 0)
    {
      error (_("load_syscalls: /proc/%d/sysent contains no syscalls!"), pi->pid);
    }

  size = header.pr_nsyscalls * sizeof (prsyscall_t);
  syscalls = xmalloc (size);

  if (read (sysent_fd, syscalls, size) != size)
    {
      xfree (syscalls);
      error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);
    }

  /* Find maximum syscall number.  This may not be the same as
     pr_nsyscalls since that value refers to the number of entries
     in the table.  (Also, the docs indicate that some system
     call numbers may be skipped.) */

  maxcall = syscalls[0].pr_number;

  for (i = 1; i <  header.pr_nsyscalls; i++)
    if (syscalls[i].pr_number > maxcall
        && syscalls[i].pr_nameoff > 0
	&& syscalls[i].pr_number < MAX_SYSCALLS)
      maxcall = syscalls[i].pr_number;

  pi->num_syscalls = maxcall+1;
  pi->syscall_names = xmalloc (pi->num_syscalls * sizeof (char *));

  for (i = 0; i < pi->num_syscalls; i++)
    pi->syscall_names[i] = NULL;

  /* Read the syscall names in */
  for (i = 0; i < header.pr_nsyscalls; i++)
    {
      char namebuf[MAX_SYSCALL_NAME_LENGTH];
      int nread;
      int callnum;

      if (syscalls[i].pr_number >= MAX_SYSCALLS
          || syscalls[i].pr_number < 0
	  || syscalls[i].pr_nameoff <= 0
	  || (lseek (sysent_fd, (off_t) syscalls[i].pr_nameoff, SEEK_SET)
                                       != (off_t) syscalls[i].pr_nameoff))
	continue;

      nread = read (sysent_fd, namebuf, sizeof namebuf);
      if (nread <= 0)
	continue;

      callnum = syscalls[i].pr_number;

      if (pi->syscall_names[callnum] != NULL)
	{
	  /* FIXME: Generate warning */
	  continue;
	}

      namebuf[nread-1] = '\0';
      size = strlen (namebuf) + 1;
      pi->syscall_names[callnum] = xmalloc (size);
      strncpy (pi->syscall_names[callnum], namebuf, size-1);
      pi->syscall_names[callnum][size-1] = '\0';
    }

  close (sysent_fd);
  xfree (syscalls);
}

/* Function: free_syscalls

   Free the space allocated for the syscall names from the procinfo
   structure.  */

static void
free_syscalls (procinfo *pi)
{
  if (pi->syscall_names)
    {
      int i;

      for (i = 0; i < pi->num_syscalls; i++)
	if (pi->syscall_names[i] != NULL)
	  xfree (pi->syscall_names[i]);

      xfree (pi->syscall_names);
      pi->syscall_names = 0;
    }
}

/* Function: find_syscall

   Given a name, look up (and return) the corresponding syscall number.
   If no match is found, return -1.  */

static int
find_syscall (procinfo *pi, char *name)
{
  int i;
  for (i = 0; i < pi->num_syscalls; i++)
    {
      if (pi->syscall_names[i] && strcmp (name, pi->syscall_names[i]) == 0)
	return i;
    }
  return -1;
}
#endif

/* =================== END, STRUCT PROCINFO "MODULE" =================== */

/* ===================  /proc  "MODULE" =================== */

/*
 * This "module" is the interface layer between the /proc system API
 * and the gdb target vector functions.  This layer consists of
 * access functions that encapsulate each of the basic operations
 * that we need to use from the /proc API.
 *
 * The main motivation for this layer is to hide the fact that
 * there are two very different implementations of the /proc API.
 * Rather than have a bunch of #ifdefs all thru the gdb target vector
 * functions, we do our best to hide them all in here.
 */

int proc_get_status (procinfo * pi);
long proc_flags (procinfo * pi);
int proc_why (procinfo * pi);
int proc_what (procinfo * pi);
int proc_set_run_on_last_close (procinfo * pi);
int proc_unset_run_on_last_close (procinfo * pi);
int proc_set_inherit_on_fork (procinfo * pi);
int proc_unset_inherit_on_fork (procinfo * pi);
int proc_set_async (procinfo * pi);
int proc_unset_async (procinfo * pi);
int proc_stop_process (procinfo * pi);
int proc_trace_signal (procinfo * pi, int signo);
int proc_ignore_signal (procinfo * pi, int signo);
int proc_clear_current_fault (procinfo * pi);
int proc_set_current_signal (procinfo * pi, int signo);
int proc_clear_current_signal (procinfo * pi);
int proc_set_gregs (procinfo * pi);
int proc_set_fpregs (procinfo * pi);
int proc_wait_for_stop (procinfo * pi);
int proc_run_process (procinfo * pi, int step, int signo);
int proc_kill (procinfo * pi, int signo);
int proc_parent_pid (procinfo * pi);
int proc_get_nthreads (procinfo * pi);
int proc_get_current_thread (procinfo * pi);
int proc_set_held_signals (procinfo * pi, gdb_sigset_t * sighold);
int proc_set_traced_sysexit (procinfo * pi, sysset_t * sysset);
int proc_set_traced_sysentry (procinfo * pi, sysset_t * sysset);
int proc_set_traced_faults (procinfo * pi, fltset_t * fltset);
int proc_set_traced_signals (procinfo * pi, gdb_sigset_t * sigset);

int proc_update_threads (procinfo * pi);
int proc_iterate_over_threads (procinfo * pi,
			       int (*func) (procinfo *, procinfo *, void *),
			       void *ptr);

gdb_gregset_t *proc_get_gregs (procinfo * pi);
gdb_fpregset_t *proc_get_fpregs (procinfo * pi);
sysset_t *proc_get_traced_sysexit (procinfo * pi, sysset_t * save);
sysset_t *proc_get_traced_sysentry (procinfo * pi, sysset_t * save);
fltset_t *proc_get_traced_faults (procinfo * pi, fltset_t * save);
gdb_sigset_t *proc_get_traced_signals (procinfo * pi, gdb_sigset_t * save);
gdb_sigset_t *proc_get_held_signals (procinfo * pi, gdb_sigset_t * save);
gdb_sigset_t *proc_get_pending_signals (procinfo * pi, gdb_sigset_t * save);
gdb_sigaction_t *proc_get_signal_actions (procinfo * pi, gdb_sigaction_t *save);

void proc_warn (procinfo * pi, char *func, int line);
void proc_error (procinfo * pi, char *func, int line);

void
proc_warn (procinfo *pi, char *func, int line)
{
  sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);
  print_sys_errmsg (errmsg, errno);
}

void
proc_error (procinfo *pi, char *func, int line)
{
  sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);
  perror_with_name (errmsg);
}

/*
 * Function: proc_get_status
 *
 * Updates the status struct in the procinfo.
 * There is a 'valid' flag, to let other functions know when
 * this function needs to be called (so the status is only
 * read when it is needed).  The status file descriptor is
 * also only opened when it is needed.
 *
 * Return: non-zero for success, zero for failure.
 */

int
proc_get_status (procinfo *pi)
{
  /* Status file descriptor is opened "lazily" */
  if (pi->status_fd == 0 &&
      open_procinfo_files (pi, FD_STATUS) == 0)
    {
      pi->status_valid = 0;
      return 0;
    }

#ifdef NEW_PROC_API
  if (lseek (pi->status_fd, 0, SEEK_SET) < 0)
    pi->status_valid = 0;			/* fail */
  else
    {
      /* Sigh... I have to read a different data structure,
	 depending on whether this is a main process or an LWP. */
      if (pi->tid)
	pi->status_valid = (read (pi->status_fd,
				  (char *) &pi->prstatus.pr_lwp,
				  sizeof (lwpstatus_t))
			    == sizeof (lwpstatus_t));
      else
	{
	  pi->status_valid = (read (pi->status_fd,
				    (char *) &pi->prstatus,
				    sizeof (gdb_prstatus_t))
			      == sizeof (gdb_prstatus_t));
#if 0 /*def UNIXWARE*/
	  if (pi->status_valid &&
	      (pi->prstatus.pr_lwp.pr_flags & PR_ISTOP) &&
	      pi->prstatus.pr_lwp.pr_why == PR_REQUESTED)
	    /* Unixware peculiarity -- read the damn thing again! */
	    pi->status_valid = (read (pi->status_fd,
				      (char *) &pi->prstatus,
				      sizeof (gdb_prstatus_t))
				== sizeof (gdb_prstatus_t));
#endif /* UNIXWARE */
	}
    }
#else	/* ioctl method */
#ifdef PIOCTSTATUS	/* osf */
  if (pi->tid == 0)	/* main process */
    {
      /* Just read the danged status.  Now isn't that simple? */
      pi->status_valid =
	(ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);
    }
  else
    {
      int win;
      struct {
	long pr_count;
	tid_t pr_error_thread;
	struct prstatus status;
      } thread_status;

      thread_status.pr_count = 1;
      thread_status.status.pr_tid = pi->tid;
      win = (ioctl (pi->status_fd, PIOCTSTATUS, &thread_status) >= 0);
      if (win)
	{
	  memcpy (&pi->prstatus, &thread_status.status,
		  sizeof (pi->prstatus));
	  pi->status_valid = 1;
	}
    }
#else
  /* Just read the danged status.  Now isn't that simple? */
  pi->status_valid = (ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);
#endif
#endif

  if (pi->status_valid)
    {
      PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
				proc_why (pi),
				proc_what (pi),
				proc_get_current_thread (pi));
    }

  /* The status struct includes general regs, so mark them valid too */
  pi->gregs_valid  = pi->status_valid;
#ifdef NEW_PROC_API
  /* In the read/write multiple-fd model,
     the status struct includes the fp regs too, so mark them valid too */
  pi->fpregs_valid = pi->status_valid;
#endif
  return pi->status_valid;	/* True if success, false if failure. */
}

/*
 * Function: proc_flags
 *
 * returns the process flags (pr_flags field).
 */

long
proc_flags (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;	/* FIXME: not a good failure value (but what is?) */

#ifdef NEW_PROC_API
# ifdef UNIXWARE
  /* UnixWare 7.1 puts process status flags, e.g. PR_ASYNC, in
     pstatus_t and LWP status flags, e.g. PR_STOPPED, in lwpstatus_t.
     The two sets of flags don't overlap. */
  return pi->prstatus.pr_flags | pi->prstatus.pr_lwp.pr_flags;
# else
  return pi->prstatus.pr_lwp.pr_flags;
# endif
#else
  return pi->prstatus.pr_flags;
#endif
}

/*
 * Function: proc_why
 *
 * returns the pr_why field (why the process stopped).
 */

int
proc_why (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;	/* FIXME: not a good failure value (but what is?) */

#ifdef NEW_PROC_API
  return pi->prstatus.pr_lwp.pr_why;
#else
  return pi->prstatus.pr_why;
#endif
}

/*
 * Function: proc_what
 *
 * returns the pr_what field (details of why the process stopped).
 */

int
proc_what (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;	/* FIXME: not a good failure value (but what is?) */

#ifdef NEW_PROC_API
  return pi->prstatus.pr_lwp.pr_what;
#else
  return pi->prstatus.pr_what;
#endif
}

#ifndef PIOCSSPCACT	/* The following is not supported on OSF.  */
/*
 * Function: proc_nsysarg
 *
 * returns the pr_nsysarg field (number of args to the current syscall).
 */

int
proc_nsysarg (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;

#ifdef NEW_PROC_API
  return pi->prstatus.pr_lwp.pr_nsysarg;
#else
  return pi->prstatus.pr_nsysarg;
#endif
}

/*
 * Function: proc_sysargs
 *
 * returns the pr_sysarg field (pointer to the arguments of current syscall).
 */

long *
proc_sysargs (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return NULL;

#ifdef NEW_PROC_API
  return (long *) &pi->prstatus.pr_lwp.pr_sysarg;
#else
  return (long *) &pi->prstatus.pr_sysarg;
#endif
}

/*
 * Function: proc_syscall
 *
 * returns the pr_syscall field (id of current syscall if we are in one).
 */

int
proc_syscall (procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;

#ifdef NEW_PROC_API
  return pi->prstatus.pr_lwp.pr_syscall;
#else
  return pi->prstatus.pr_syscall;
#endif
}
#endif /* PIOCSSPCACT */

/*
 * Function: proc_cursig:
 *
 * returns the pr_cursig field (current signal).
 */

long
proc_cursig (struct procinfo *pi)
{
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return 0;	/* FIXME: not a good failure value (but what is?) */

#ifdef NEW_PROC_API
  return pi->prstatus.pr_lwp.pr_cursig;
#else
  return pi->prstatus.pr_cursig;
#endif
}

/*
 * Function: proc_modify_flag
 *
 *  === I appologize for the messiness of this function.
 *  === This is an area where the different versions of
 *  === /proc are more inconsistent than usual.     MVS
 *
 * Set or reset any of the following process flags:
 *    PR_FORK	-- forked child will inherit trace flags
 *    PR_RLC	-- traced process runs when last /proc file closed.
 *    PR_KLC    -- traced process is killed when last /proc file closed.
 *    PR_ASYNC	-- LWP's get to run/stop independently.
 *
 * There are three methods for doing this function:
 * 1) Newest: read/write [PCSET/PCRESET/PCUNSET]
 *    [Sol6, Sol7, UW]
 * 2) Middle: PIOCSET/PIOCRESET
 *    [Irix, Sol5]
 * 3) Oldest: PIOCSFORK/PIOCRFORK/PIOCSRLC/PIOCRRLC
 *    [OSF, Sol5]
 *
 * Note: Irix does not define PR_ASYNC.
 * Note: OSF  does not define PR_KLC.
 * Note: OSF  is the only one that can ONLY use the oldest method.
 *
 * Arguments:
 *    pi   -- the procinfo
 *    flag -- one of PR_FORK, PR_RLC, or PR_ASYNC
 *    mode -- 1 for set, 0 for reset.
 *
 * Returns non-zero for success, zero for failure.
 */

enum { FLAG_RESET, FLAG_SET };

static int
proc_modify_flag (procinfo *pi, long flag, long mode)
{
  long win = 0;		/* default to fail */

  /*
   * These operations affect the process as a whole, and applying
   * them to an individual LWP has the same meaning as applying them
   * to the main process.  Therefore, if we're ever called with a
   * pointer to an LWP's procinfo, let's substitute the process's
   * procinfo and avoid opening the LWP's file descriptor
   * unnecessarily.
   */

  if (pi->pid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API	/* Newest method: UnixWare and newer Solarii */
  /* First normalize the PCUNSET/PCRESET command opcode
     (which for no obvious reason has a different definition
     from one operating system to the next...)  */
#ifdef  PCUNSET
#define GDBRESET PCUNSET
#else
#ifdef  PCRESET
#define GDBRESET PCRESET
#endif
#endif
  {
    procfs_ctl_t arg[2];

    if (mode == FLAG_SET)	/* Set the flag (RLC, FORK, or ASYNC) */
      arg[0] = PCSET;
    else			/* Reset the flag */
      arg[0] = GDBRESET;

    arg[1] = flag;
    win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
  }
#else
#ifdef PIOCSET		/* Irix/Sol5 method */
  if (mode == FLAG_SET)	/* Set the flag (hopefully RLC, FORK, or ASYNC) */
    {
      win = (ioctl (pi->ctl_fd, PIOCSET, &flag)   >= 0);
    }
  else			/* Reset the flag */
    {
      win = (ioctl (pi->ctl_fd, PIOCRESET, &flag) >= 0);
    }

#else
#ifdef PIOCSRLC		/* Oldest method: OSF */
  switch (flag) {
  case PR_RLC:
    if (mode == FLAG_SET)	/* Set run-on-last-close */
      {
	win = (ioctl (pi->ctl_fd, PIOCSRLC, NULL) >= 0);
      }
    else			/* Clear run-on-last-close */
      {
	win = (ioctl (pi->ctl_fd, PIOCRRLC, NULL) >= 0);
      }
    break;
  case PR_FORK:
    if (mode == FLAG_SET)	/* Set inherit-on-fork */
      {
	win = (ioctl (pi->ctl_fd, PIOCSFORK, NULL) >= 0);
      }
    else			/* Clear inherit-on-fork */
      {
	win = (ioctl (pi->ctl_fd, PIOCRFORK, NULL) >= 0);
      }
    break;
  default:
    win = 0;		/* fail -- unknown flag (can't do PR_ASYNC) */
    break;
  }
#endif
#endif
#endif
#undef GDBRESET
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  if (!win)
    warning (_("procfs: modify_flag failed to turn %s %s"),
	     flag == PR_FORK  ? "PR_FORK"  :
	     flag == PR_RLC   ? "PR_RLC"   :
#ifdef PR_ASYNC
	     flag == PR_ASYNC ? "PR_ASYNC" :
#endif
#ifdef PR_KLC
	     flag == PR_KLC   ? "PR_KLC"   :
#endif
	     "<unknown flag>",
	     mode == FLAG_RESET ? "off" : "on");

  return win;
}

/*
 * Function: proc_set_run_on_last_close
 *
 * Set the run_on_last_close flag.
 * Process with all threads will become runnable
 * when debugger closes all /proc fds.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_run_on_last_close (procinfo *pi)
{
  return proc_modify_flag (pi, PR_RLC, FLAG_SET);
}

/*
 * Function: proc_unset_run_on_last_close
 *
 * Reset the run_on_last_close flag.
 * Process will NOT become runnable
 * when debugger closes its file handles.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_unset_run_on_last_close (procinfo *pi)
{
  return proc_modify_flag (pi, PR_RLC, FLAG_RESET);
}

#ifdef PR_KLC
/*
 * Function: proc_set_kill_on_last_close
 *
 * Set the kill_on_last_close flag.
 * Process with all threads will be killed when debugger
 * closes all /proc fds (or debugger exits or dies).
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_kill_on_last_close (procinfo *pi)
{
  return proc_modify_flag (pi, PR_KLC, FLAG_SET);
}

/*
 * Function: proc_unset_kill_on_last_close
 *
 * Reset the kill_on_last_close flag.
 * Process will NOT be killed when debugger
 * closes its file handles (or exits or dies).
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_unset_kill_on_last_close (procinfo *pi)
{
  return proc_modify_flag (pi, PR_KLC, FLAG_RESET);
}
#endif /* PR_KLC */

/*
 * Function: proc_set_inherit_on_fork
 *
 * Set inherit_on_fork flag.
 * If the process forks a child while we are registered for events
 * in the parent, then we will also recieve events from the child.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_inherit_on_fork (procinfo *pi)
{
  return proc_modify_flag (pi, PR_FORK, FLAG_SET);
}

/*
 * Function: proc_unset_inherit_on_fork
 *
 * Reset inherit_on_fork flag.
 * If the process forks a child while we are registered for events
 * in the parent, then we will NOT recieve events from the child.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_unset_inherit_on_fork (procinfo *pi)
{
  return proc_modify_flag (pi, PR_FORK, FLAG_RESET);
}

#ifdef PR_ASYNC
/*
 * Function: proc_set_async
 *
 * Set PR_ASYNC flag.
 * If one LWP stops because of a debug event (signal etc.),
 * the remaining LWPs will continue to run.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_async (procinfo *pi)
{
  return proc_modify_flag (pi, PR_ASYNC, FLAG_SET);
}

/*
 * Function: proc_unset_async
 *
 * Reset PR_ASYNC flag.
 * If one LWP stops because of a debug event (signal etc.),
 * then all other LWPs will stop as well.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_unset_async (procinfo *pi)
{
  return proc_modify_flag (pi, PR_ASYNC, FLAG_RESET);
}
#endif /* PR_ASYNC */

/*
 * Function: proc_stop_process
 *
 * Request the process/LWP to stop.  Does not wait.
 * Returns non-zero for success, zero for failure.
 */

int
proc_stop_process (procinfo *pi)
{
  int win;

  /*
   * We might conceivably apply this operation to an LWP, and
   * the LWP's ctl file descriptor might not be open.
   */

  if (pi->ctl_fd == 0 &&
      open_procinfo_files (pi, FD_CTL) == 0)
    return 0;
  else
    {
#ifdef NEW_PROC_API
      procfs_ctl_t cmd = PCSTOP;
      win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
#else	/* ioctl method */
      win = (ioctl (pi->ctl_fd, PIOCSTOP, &pi->prstatus) >= 0);
      /* Note: the call also reads the prstatus.  */
      if (win)
	{
	  pi->status_valid = 1;
	  PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
				    proc_why (pi),
				    proc_what (pi),
				    proc_get_current_thread (pi));
	}
#endif
    }

  return win;
}

/*
 * Function: proc_wait_for_stop
 *
 * Wait for the process or LWP to stop (block until it does).
 * Returns non-zero for success, zero for failure.
 */

int
proc_wait_for_stop (procinfo *pi)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    procfs_ctl_t cmd = PCWSTOP;
    win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
    /* We been runnin' and we stopped -- need to update status.  */
    pi->status_valid = 0;
  }
#else	/* ioctl method */
  win = (ioctl (pi->ctl_fd, PIOCWSTOP, &pi->prstatus) >= 0);
  /* Above call also refreshes the prstatus.  */
  if (win)
    {
      pi->status_valid = 1;
      PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
				proc_why (pi),
				proc_what (pi),
				proc_get_current_thread (pi));
    }
#endif

  return win;
}

/*
 * Function: proc_run_process
 *
 * Make the process or LWP runnable.
 * Options (not all are implemented):
 *   - single-step
 *   - clear current fault
 *   - clear current signal
 *   - abort the current system call
 *   - stop as soon as finished with system call
 *   - (ioctl): set traced signal set
 *   - (ioctl): set held   signal set
 *   - (ioctl): set traced fault  set
 *   - (ioctl): set start pc (vaddr)
 * Always clear the current fault.
 * Clear the current signal if 'signo' is zero.
 *
 * Arguments:
 *   pi		the process or LWP to operate on.
 *   step	if true, set the process or LWP to trap after one instr.
 *   signo	if zero, clear the current signal if any.
 *		if non-zero, set the current signal to this one.
 *
 * Returns non-zero for success, zero for failure.
 */

int
proc_run_process (procinfo *pi, int step, int signo)
{
  int win;
  int runflags;

  /*
   * We will probably have to apply this operation to individual threads,
   * so make sure the control file descriptor is open.
   */

  if (pi->ctl_fd == 0 &&
      open_procinfo_files (pi, FD_CTL) == 0)
    {
      return 0;
    }

  runflags    = PRCFAULT;	/* always clear current fault  */
  if (step)
    runflags |= PRSTEP;
  if (signo == 0)
    runflags |= PRCSIG;
  else if (signo != -1)		/* -1 means do nothing W.R.T. signals */
    proc_set_current_signal (pi, signo);

#ifdef NEW_PROC_API
  {
    procfs_ctl_t cmd[2];

    cmd[0]  = PCRUN;
    cmd[1]  = runflags;
    win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
  }
#else	/* ioctl method */
  {
    prrun_t prrun;

    memset (&prrun, 0, sizeof (prrun));
    prrun.pr_flags  = runflags;
    win = (ioctl (pi->ctl_fd, PIOCRUN, &prrun) >= 0);
  }
#endif

  return win;
}

/*
 * Function: proc_set_traced_signals
 *
 * Register to trace signals in the process or LWP.
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_traced_signals (procinfo *pi, gdb_sigset_t *sigset)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    struct {
      procfs_ctl_t cmd;
      /* Use char array to avoid alignment issues.  */
      char sigset[sizeof (gdb_sigset_t)];
    } arg;

    arg.cmd = PCSTRACE;
    memcpy (&arg.sigset, sigset, sizeof (gdb_sigset_t));

    win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
  }
#else	/* ioctl method */
  win = (ioctl (pi->ctl_fd, PIOCSTRACE, sigset) >= 0);
#endif
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  if (!win)
    warning (_("procfs: set_traced_signals failed"));
  return win;
}

/*
 * Function: proc_set_traced_faults
 *
 * Register to trace hardware faults in the process or LWP.
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_traced_faults (procinfo *pi, fltset_t *fltset)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    struct {
      procfs_ctl_t cmd;
      /* Use char array to avoid alignment issues.  */
      char fltset[sizeof (fltset_t)];
    } arg;

    arg.cmd = PCSFAULT;
    memcpy (&arg.fltset, fltset, sizeof (fltset_t));

    win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
  }
#else	/* ioctl method */
  win = (ioctl (pi->ctl_fd, PIOCSFAULT, fltset) >= 0);
#endif
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  return win;
}

/*
 * Function: proc_set_traced_sysentry
 *
 * Register to trace entry to system calls in the process or LWP.
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    struct gdb_proc_ctl_pcsentry {
      procfs_ctl_t cmd;
      /* Use char array to avoid alignment issues.  */
      char sysset[sizeof (sysset_t)];
    } *argp;
    int argp_size = sizeof (struct gdb_proc_ctl_pcsentry)
                  - sizeof (sysset_t)
		  + sysset_t_size (pi);

    argp = xmalloc (argp_size);

    argp->cmd = PCSENTRY;
    memcpy (&argp->sysset, sysset, sysset_t_size (pi));

    win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);
    xfree (argp);
  }
#else	/* ioctl method */
  win = (ioctl (pi->ctl_fd, PIOCSENTRY, sysset) >= 0);
#endif
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  return win;
}

/*
 * Function: proc_set_traced_sysexit
 *
 * Register to trace exit from system calls in the process or LWP.
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    struct gdb_proc_ctl_pcsexit {
      procfs_ctl_t cmd;
      /* Use char array to avoid alignment issues.  */
      char sysset[sizeof (sysset_t)];
    } *argp;
    int argp_size = sizeof (struct gdb_proc_ctl_pcsexit)
                  - sizeof (sysset_t)
		  + sysset_t_size (pi);

    argp = xmalloc (argp_size);

    argp->cmd = PCSEXIT;
    memcpy (&argp->sysset, sysset, sysset_t_size (pi));

    win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);
    xfree (argp);
  }
#else	/* ioctl method */
  win = (ioctl (pi->ctl_fd, PIOCSEXIT, sysset) >= 0);
#endif
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  return win;
}

/*
 * Function: proc_set_held_signals
 *
 * Specify the set of blocked / held signals in the process or LWP.
 * Returns non-zero for success, zero for failure.
 */

int
proc_set_held_signals (procinfo *pi, gdb_sigset_t *sighold)
{
  int win;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  {
    struct {
      procfs_ctl_t cmd;
      /* Use char array to avoid alignment issues.  */
      char hold[sizeof (gdb_sigset_t)];
    } arg;

    arg.cmd  = PCSHOLD;
    memcpy (&arg.hold, sighold, sizeof (gdb_sigset_t));
    win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
  }
#else
  win = (ioctl (pi->ctl_fd, PIOCSHOLD, sighold) >= 0);
#endif
  /* The above operation renders the procinfo's cached pstatus obsolete. */
  pi->status_valid = 0;

  return win;
}

/*
 * Function: proc_get_pending_signals
 *
 * returns the set of signals that are pending in the process or LWP.
 * Will also copy the sigset if 'save' is non-zero.
 */

gdb_sigset_t *
proc_get_pending_signals (procinfo *pi, gdb_sigset_t *save)
{
  gdb_sigset_t *ret = NULL;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return NULL;

#ifdef NEW_PROC_API
  ret = &pi->prstatus.pr_lwp.pr_lwppend;
#else
  ret = &pi->prstatus.pr_sigpend;
#endif
  if (save && ret)
    memcpy (save, ret, sizeof (gdb_sigset_t));

  return ret;
}

/*
 * Function: proc_get_signal_actions
 *
 * returns the set of signal actions.
 * Will also copy the sigactionset if 'save' is non-zero.
 */

gdb_sigaction_t *
proc_get_signal_actions (procinfo *pi, gdb_sigaction_t *save)
{
  gdb_sigaction_t *ret = NULL;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return NULL;

#ifdef NEW_PROC_API
  ret = &pi->prstatus.pr_lwp.pr_action;
#else
  ret = &pi->prstatus.pr_action;
#endif
  if (save && ret)
    memcpy (save, ret, sizeof (gdb_sigaction_t));

  return ret;
}

/*
 * Function: proc_get_held_signals
 *
 * returns the set of signals that are held / blocked.
 * Will also copy the sigset if 'save' is non-zero.
 */

gdb_sigset_t *
proc_get_held_signals (procinfo *pi, gdb_sigset_t *save)
{
  gdb_sigset_t *ret = NULL;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return NULL;

#ifdef UNIXWARE
  ret = &pi->prstatus.pr_lwp.pr_context.uc_sigmask;
#else
  ret = &pi->prstatus.pr_lwp.pr_lwphold;
#endif /* UNIXWARE */
#else  /* not NEW_PROC_API */
  {
    static gdb_sigset_t sigheld;

    if (ioctl (pi->ctl_fd, PIOCGHOLD, &sigheld) >= 0)
      ret = &sigheld;
  }
#endif /* NEW_PROC_API */
  if (save && ret)
    memcpy (save, ret, sizeof (gdb_sigset_t));

  return ret;
}

/*
 * Function: proc_get_traced_signals
 *
 * returns the set of signals that are traced / debugged.
 * Will also copy the sigset if 'save' is non-zero.
 */

gdb_sigset_t *
proc_get_traced_signals (procinfo *pi, gdb_sigset_t *save)
{
  gdb_sigset_t *ret = NULL;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes
   * for any reason, then take out the following clause and
   * replace it with one that makes sure the ctl_fd is open.
   */

  if (pi->tid != 0)
    pi = find_procinfo_or_die (pi->pid, 0);

#ifdef NEW_PROC_API
  if (!pi->status_valid)
    if (!proc_get_status (pi))
      return NULL;

  ret = &pi->prstatus.pr_sigtrace;
#else
  {
    static gdb_sigset_t sigtrace;

    if (ioctl (pi->ctl_fd, PIOCGTRACE, &sigtrace) >= 0)
      ret = &sigtrace;
  }
#endif
  if (save && ret)
    memcpy (save, ret, sizeof (gdb_sigset_t));

  return ret;
}

/*
 * Function: proc_trace_signal
 *
 * Add 'signo' to the set of signals that are traced.
 * Returns non-zero for success, zero for failure.
 */

int
proc_trace_signal (procinfo *pi, int signo)
{
  gdb_sigset_t temp;

  /*
   * We should never have to apply this operation to any procinfo
   * except the one for the main process.  If that ever changes


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