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/* Native-dependent code for NetBSD.
Copyright (C) 2006-2020 Free Software Foundation, Inc.
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 "nbsd-nat.h"
#include "gdbthread.h"
#include "inferior.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
/* Return the name of a file that can be opened to get the symbols for
the child process identified by PID. */
char *
nbsd_nat_target::pid_to_exec_file (int pid)
{
static char buf[PATH_MAX];
size_t buflen;
int mib[4] = {CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_PATHNAME};
buflen = sizeof (buf);
if (sysctl (mib, ARRAY_SIZE (mib), buf, &buflen, NULL, 0))
return NULL;
return buf;
}
/* Generic thread (LWP) lister within a specified process. The callback
parameters is a C++ function that is called for each detected thread. */
static bool
nbsd_thread_lister (const pid_t pid,
gdb::function_view<bool (const struct kinfo_lwp *)>
callback)
{
int mib[5] = {CTL_KERN, KERN_LWP, pid, sizeof (struct kinfo_lwp), 0};
size_t size;
if (sysctl (mib, ARRAY_SIZE (mib), NULL, &size, NULL, 0) == -1 || size == 0)
perror_with_name (("sysctl"));
mib[4] = size / sizeof (size_t);
gdb::unique_xmalloc_ptr<struct kinfo_lwp[]> kl
((struct kinfo_lwp *) xcalloc (size, 1));
if (sysctl (mib, ARRAY_SIZE (mib), kl.get (), &size, NULL, 0) == -1
|| size == 0)
perror_with_name (("sysctl"));
for (size_t i = 0; i < size / sizeof (struct kinfo_lwp); i++)
{
struct kinfo_lwp *l = &kl[i];
/* Return true if the specified thread is alive. */
auto lwp_alive
= [] (struct kinfo_lwp *lwp)
{
switch (lwp->l_stat)
{
case LSSLEEP:
case LSRUN:
case LSONPROC:
case LSSTOP:
case LSSUSPENDED:
return true;
default:
return false;
}
};
/* Ignore embryonic or demised threads. */
if (!lwp_alive (l))
continue;
if (callback (l))
return true;
}
return false;
}
/* Return true if PTID is still active in the inferior. */
bool
nbsd_nat_target::thread_alive (ptid_t ptid)
{
pid_t pid = ptid.pid ();
int lwp = ptid.lwp ();
auto fn
= [&lwp] (const struct kinfo_lwp *kl)
{
return kl->l_lid == lwp;
};
return nbsd_thread_lister (pid, fn);
}
/* Return the name assigned to a thread by an application. Returns
the string in a static buffer. */
const char *
nbsd_nat_target::thread_name (struct thread_info *thr)
{
ptid_t ptid = thr->ptid;
pid_t pid = ptid.pid ();
int lwp = ptid.lwp ();
static char buf[KI_LNAMELEN] = {};
auto fn
= [&lwp] (const struct kinfo_lwp *kl)
{
if (kl->l_lid == lwp)
{
xsnprintf (buf, sizeof buf, "%s", kl->l_name);
return true;
}
return false;
};
if (nbsd_thread_lister (pid, fn))
return buf;
else
return NULL;
}
/* Implement the "post_attach" target_ops method. */
static void
nbsd_add_threads (nbsd_nat_target *target, pid_t pid)
{
auto fn
= [&target, &pid] (const struct kinfo_lwp *kl)
{
ptid_t ptid = ptid_t (pid, kl->l_lid, 0);
if (!in_thread_list (target, ptid))
{
if (inferior_ptid.lwp () == 0)
thread_change_ptid (target, inferior_ptid, ptid);
else
add_thread (target, ptid);
}
return false;
};
nbsd_thread_lister (pid, fn);
}
/* Implement the "post_attach" target_ops method. */
void
nbsd_nat_target::post_attach (int pid)
{
nbsd_add_threads (this, pid);
}
/* Implement the "update_thread_list" target_ops method. */
void
nbsd_nat_target::update_thread_list ()
{
prune_threads ();
nbsd_add_threads (this, inferior_ptid.pid ());
}
/* Convert PTID to a string. */
std::string
nbsd_nat_target::pid_to_str (ptid_t ptid)
{
int lwp = ptid.lwp ();
if (lwp != 0)
{
pid_t pid = ptid.pid ();
return string_printf ("LWP %d of process %d", lwp, pid);
}
return normal_pid_to_str (ptid);
}
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