87b0bb13cb
* common/linux-procfs.c (linux_proc_get_int): New, from linux_proc_get_tgid, change its LWPID type to pid_t, add parameter field. (linux_proc_get_tgid): Only call linux_proc_get_int. (linux_proc_get_tracerpid): New. (linux_proc_pid_has_state): New, from linux_proc_pid_is_zombie. (linux_proc_pid_is_stopped, linux_proc_pid_is_zombie): Only call linux_proc_pid_has_state. * common/linux-procfs.h (linux_proc_get_tracerpid): New declaration. * common/linux-ptrace.c: Include linux-procfs.h and buffer.h. (linux_ptrace_attach_warnings): New. * common/linux-ptrace.h (struct buffer, linux_ptrace_attach_warnings): New declaration. * linux-nat.c: Include exceptions.h, linux-ptrace.h and buffer.h. (linux_nat_attach): New variables ex, buffer, message and message_s. Wrap to_attach by TRY_CATCH and call linux_ptrace_attach_warnings. gdb/gdbserver/ * linux-low.c (linux_attach_lwp_1): New variable buffer. Call linux_ptrace_attach_warnings. gdb/testsuite/ * gdb.base/attach-twice.c: New files. * gdb.base/attach-twice.exp: New files.
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/* Linux-specific PROCFS manipulation routines.
|
|
Copyright (C) 2009-2012 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/>. */
|
|
|
|
#ifdef GDBSERVER
|
|
#include "server.h"
|
|
#else
|
|
#include "defs.h"
|
|
#include "gdb_string.h"
|
|
#endif
|
|
|
|
#include "linux-procfs.h"
|
|
|
|
/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
|
|
found. */
|
|
|
|
static int
|
|
linux_proc_get_int (pid_t lwpid, const char *field)
|
|
{
|
|
size_t field_len = strlen (field);
|
|
FILE *status_file;
|
|
char buf[100];
|
|
int retval = -1;
|
|
|
|
snprintf (buf, sizeof (buf), "/proc/%d/status", (int) lwpid);
|
|
status_file = fopen (buf, "r");
|
|
if (status_file == NULL)
|
|
{
|
|
warning (_("unable to open /proc file '%s'"), buf);
|
|
return -1;
|
|
}
|
|
|
|
while (fgets (buf, sizeof (buf), status_file))
|
|
if (strncmp (buf, field, field_len) == 0 && buf[field_len] == ':')
|
|
{
|
|
retval = strtol (&buf[field_len + 1], NULL, 10);
|
|
break;
|
|
}
|
|
|
|
fclose (status_file);
|
|
return retval;
|
|
}
|
|
|
|
/* Return the TGID of LWPID from /proc/pid/status. Returns -1 if not
|
|
found. */
|
|
|
|
int
|
|
linux_proc_get_tgid (pid_t lwpid)
|
|
{
|
|
return linux_proc_get_int (lwpid, "Tgid");
|
|
}
|
|
|
|
/* See linux-procfs.h. */
|
|
|
|
pid_t
|
|
linux_proc_get_tracerpid (pid_t lwpid)
|
|
{
|
|
return linux_proc_get_int (lwpid, "TracerPid");
|
|
}
|
|
|
|
/* Return non-zero if 'State' of /proc/PID/status contains STATE. */
|
|
|
|
static int
|
|
linux_proc_pid_has_state (pid_t pid, const char *state)
|
|
{
|
|
char buffer[100];
|
|
FILE *procfile;
|
|
int retval;
|
|
int have_state;
|
|
|
|
xsnprintf (buffer, sizeof (buffer), "/proc/%d/status", (int) pid);
|
|
procfile = fopen (buffer, "r");
|
|
if (procfile == NULL)
|
|
{
|
|
warning (_("unable to open /proc file '%s'"), buffer);
|
|
return 0;
|
|
}
|
|
|
|
have_state = 0;
|
|
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
|
|
if (strncmp (buffer, "State:", 6) == 0)
|
|
{
|
|
have_state = 1;
|
|
break;
|
|
}
|
|
retval = (have_state && strstr (buffer, state) != NULL);
|
|
fclose (procfile);
|
|
return retval;
|
|
}
|
|
|
|
/* Detect `T (stopped)' in `/proc/PID/status'.
|
|
Other states including `T (tracing stop)' are reported as false. */
|
|
|
|
int
|
|
linux_proc_pid_is_stopped (pid_t pid)
|
|
{
|
|
return linux_proc_pid_has_state (pid, "T (stopped)");
|
|
}
|
|
|
|
/* See linux-procfs.h declaration. */
|
|
|
|
int
|
|
linux_proc_pid_is_zombie (pid_t pid)
|
|
{
|
|
return linux_proc_pid_has_state (pid, "Z (zombie)");
|
|
}
|