2013-02-04 Sergio Durigan Junior <sergiodj@redhat.com>

	    Denys Vlasenko  <dvlasenk@redhat.com>
	    Pedro Alves  <palves@redhat.com>

	* gdbarch.sh (elfcore_write_linux_prpsinfo): New F hook.
	(struct elf_internal_linux_prpsinfo): Forward declare.
	* gdbarch.h, gdbarch.c: Regenerate.
	* linux-tdep.c: Include `cli/cli-utils.h'.
	(linux_fill_prpsinfo): New function.
	(linux_make_corefile_notes): Use linux_fill_prpsinfo.  If there's
	an elfcore_write_linux_prpsinfo hook, use it, otherwise, use
	elfcore_write_linux_prpsinfo32 or elfcore_write_linux_prpsinfo64
	depending on gdbarch pointer bitness.
	* ppc-linux-tdep.c: Include elf-bfd.h.
	(ppc_linux_init_abi): Hook in elfcore_write_ppc_linux_prpsinfo32
	on 32-bit.

1 files changed, 220 insertions, 15 deletions

diff --git a/gdb/linux-tdep.c b/gdb/linux-tdep.c
index 836da62..04afbb1 100644
--- a/gdb/linux-tdep.c
+++ b/gdb/linux-tdep.c
@@ -32,6 +32,7 @@
 #include "cli/cli-utils.h"
 #include "arch-utils.h"
 #include "gdb_obstack.h"
+#include "cli/cli-utils.h"
 
 #include <ctype.h>
 
@@ -1153,6 +1154,206 @@ linux_corefile_thread_callback (struct thread_info *info, void *data)
   return !args->note_data;
 }
 
+/* Fill the PRPSINFO structure with information about the process being
+   debugged.  Returns 1 in case of success, 0 for failures.  Please note that
+   even if the structure cannot be entirely filled (e.g., GDB was unable to
+   gather information about the process UID/GID), this function will still
+   return 1 since some information was already recorded.  It will only return
+   0 iff nothing can be gathered.  */
+
+static int
+linux_fill_prpsinfo (struct elf_internal_linux_prpsinfo *p)
+{
+  /* The filename which we will use to obtain some info about the process.
+     We will basically use this to store the `/proc/PID/FILENAME' file.  */
+  char filename[100];
+  /* The full name of the program which generated the corefile.  */
+  char *fname;
+  /* The basename of the executable.  */
+  const char *basename;
+  /* The arguments of the program.  */
+  char *psargs;
+  char *infargs;
+  /* The contents of `/proc/PID/stat' and `/proc/PID/status' files.  */
+  char *proc_stat, *proc_status;
+  /* Temporary buffer.  */
+  char *tmpstr;
+  /* The valid states of a process, according to the Linux kernel.  */
+  const char valid_states[] = "RSDTZW";
+  /* The program state.  */
+  const char *prog_state;
+  /* The state of the process.  */
+  char pr_sname;
+  /* The PID of the program which generated the corefile.  */
+  pid_t pid;
+  /* Process flags.  */
+  unsigned int pr_flag;
+  /* Process nice value.  */
+  long pr_nice;
+  /* The number of fields read by `sscanf'.  */
+  int n_fields = 0;
+  /* Cleanups.  */
+  struct cleanup *c;
+  int i;
+
+  gdb_assert (p != NULL);
+
+  /* Obtaining PID and filename.  */
+  pid = ptid_get_pid (inferior_ptid);
+  xsnprintf (filename, sizeof (filename), "/proc/%d/cmdline", (int) pid);
+  fname = target_fileio_read_stralloc (filename);
+
+  if (fname == NULL || *fname == '\0')
+    {
+      /* No program name was read, so we won't be able to retrieve more
+	 information about the process.  */
+      xfree (fname);
+      return 0;
+    }
+
+  c = make_cleanup (xfree, fname);
+  memset (p, 0, sizeof (*p));
+
+  /* Defining the PID.  */
+  p->pr_pid = pid;
+
+  /* Copying the program name.  Only the basename matters.  */
+  basename = lbasename (fname);
+  strncpy (p->pr_fname, basename, sizeof (p->pr_fname));
+  p->pr_fname[sizeof (p->pr_fname) - 1] = '\0';
+
+  infargs = get_inferior_args ();
+
+  psargs = xstrdup (fname);
+  if (infargs != NULL)
+    psargs = reconcat (psargs, psargs, " ", infargs, NULL);
+
+  make_cleanup (xfree, psargs);
+
+  strncpy (p->pr_psargs, psargs, sizeof (p->pr_psargs));
+  p->pr_psargs[sizeof (p->pr_psargs) - 1] = '\0';
+
+  xsnprintf (filename, sizeof (filename), "/proc/%d/stat", (int) pid);
+  proc_stat = target_fileio_read_stralloc (filename);
+  make_cleanup (xfree, proc_stat);
+
+  if (proc_stat == NULL || *proc_stat == '\0')
+    {
+      /* Despite being unable to read more information about the
+	 process, we return 1 here because at least we have its
+	 command line, PID and arguments.  */
+      do_cleanups (c);
+      return 1;
+    }
+
+  /* Ok, we have the stats.  It's time to do a little parsing of the
+     contents of the buffer, so that we end up reading what we want.
+
+     The following parsing mechanism is strongly based on the
+     information generated by the `fs/proc/array.c' file, present in
+     the Linux kernel tree.  More details about how the information is
+     displayed can be obtained by seeing the manpage of proc(5),
+     specifically under the entry of `/proc/[pid]/stat'.  */
+
+  /* Getting rid of the PID, since we already have it.  */
+  while (isdigit (*proc_stat))
+    ++proc_stat;
+
+  proc_stat = skip_spaces (proc_stat);
+
+  /* Getting rid of the executable name, since we already have it.  We
+     know that this name will be in parentheses, so we can safely look
+     for the close-paren.  */
+  while (*proc_stat != ')')
+    ++proc_stat;
+  ++proc_stat;
+
+  proc_stat = skip_spaces (proc_stat);
+
+  n_fields = sscanf (proc_stat,
+		     "%c"		/* Process state.  */
+		     "%d%d%d"		/* Parent PID, group ID, session ID.  */
+		     "%*d%*d"		/* tty_nr, tpgid (not used).  */
+		     "%u"		/* Flags.  */
+		     "%*s%*s%*s%*s"	/* minflt, cminflt, majflt,
+					   cmajflt (not used).  */
+		     "%*s%*s%*s%*s"	/* utime, stime, cutime,
+					   cstime (not used).  */
+		     "%*s"		/* Priority (not used).  */
+		     "%ld",		/* Nice.  */
+		     &pr_sname,
+		     &p->pr_ppid, &p->pr_pgrp, &p->pr_sid,
+		     &pr_flag,
+		     &pr_nice);
+
+  if (n_fields != 6)
+    {
+      /* Again, we couldn't read the complementary information about
+	 the process state.  However, we already have minimal
+	 information, so we just return 1 here.  */
+      do_cleanups (c);
+      return 1;
+    }
+
+  /* Filling the structure fields.  */
+  prog_state = strchr (valid_states, pr_sname);
+  if (prog_state != NULL)
+    p->pr_state = prog_state - valid_states;
+  else
+    {
+      /* Zero means "Running".  */
+      p->pr_state = 0;
+    }
+
+  p->pr_sname = p->pr_state > 5 ? '.' : pr_sname;
+  p->pr_zomb = p->pr_sname == 'Z';
+  p->pr_nice = pr_nice;
+  p->pr_flag = pr_flag;
+
+  /* Finally, obtaining the UID and GID.  For that, we read and parse the
+     contents of the `/proc/PID/status' file.  */
+  xsnprintf (filename, sizeof (filename), "/proc/%d/status", (int) pid);
+  proc_status = target_fileio_read_stralloc (filename);
+  make_cleanup (xfree, proc_status);
+
+  if (proc_status == NULL || *proc_status == '\0')
+    {
+      /* Returning 1 since we already have a bunch of information.  */
+      do_cleanups (c);
+      return 1;
+    }
+
+  /* Extracting the UID.  */
+  tmpstr = strstr (proc_status, "Uid:");
+  if (tmpstr != NULL)
+    {
+      /* Advancing the pointer to the beginning of the UID.  */
+      tmpstr += sizeof ("Uid:");
+      while (*tmpstr != '\0' && !isdigit (*tmpstr))
+	++tmpstr;
+
+      if (isdigit (*tmpstr))
+	p->pr_uid = strtol (tmpstr, &tmpstr, 10);
+    }
+
+  /* Extracting the GID.  */
+  tmpstr = strstr (proc_status, "Gid:");
+  if (tmpstr != NULL)
+    {
+      /* Advancing the pointer to the beginning of the GID.  */
+      tmpstr += sizeof ("Gid:");
+      while (*tmpstr != '\0' && !isdigit (*tmpstr))
+	++tmpstr;
+
+      if (isdigit (*tmpstr))
+	p->pr_gid = strtol (tmpstr, &tmpstr, 10);
+    }
+
+  do_cleanups (c);
+
+  return 1;
+}
+
 /* Fills the "to_make_corefile_note" target vector.  Builds the note
    section for a corefile, and returns it in a malloc buffer.  */
 
@@ -1161,26 +1362,30 @@ linux_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size,
 			   linux_collect_thread_registers_ftype collect)
 {
   struct linux_corefile_thread_data thread_args;
+  struct elf_internal_linux_prpsinfo prpsinfo;
   char *note_data = NULL;
   gdb_byte *auxv;
   int auxv_len;
 
-  /* Process information.  */
-  if (get_exec_file (0))
+  if (linux_fill_prpsinfo (&prpsinfo))
     {
-      const char *fname = lbasename (get_exec_file (0));
-      char *psargs = xstrdup (fname);
-
-      if (get_inferior_args ())
-        psargs = reconcat (psargs, psargs, " ", get_inferior_args (),
-			   (char *) NULL);
-
-      note_data = elfcore_write_prpsinfo (obfd, note_data, note_size,
-                                          fname, psargs);
-      xfree (psargs);
-
-      if (!note_data)
-	return NULL;
+      if (gdbarch_elfcore_write_linux_prpsinfo_p (gdbarch))
+	{
+	  note_data = gdbarch_elfcore_write_linux_prpsinfo (gdbarch, obfd,
+							    note_data, note_size,
+							    &prpsinfo);
+	}
+      else
+	{
+	  if (gdbarch_ptr_bit (gdbarch) == 64)
+	    note_data = elfcore_write_linux_prpsinfo64 (obfd,
+							note_data, note_size,
+							&prpsinfo);
+	  else
+	    note_data = elfcore_write_linux_prpsinfo32 (obfd,
+							note_data, note_size,
+							&prpsinfo);
+	}
     }
 
   /* Thread register information.  */