forked from Imagelibrary/binutils-gdb
* Makefile.in (linux-nat.o): Add rule.
* linux-nat.c: New file. * config/nm-linux.h (CHILD_INSERT_FORK_CATCHPOINT): Define. (CHILD_INSERT_VFORK_CATCHPOINT): Define. (CHILD_INSERT_EXEC_CATCHPOINT): Define. * config/alpha/alpha-linux.mh (NATDEPFILES): Add linux-nat.o. * config/arm/linux.mh (NATDEPFILES): Likewise. * config/i386/linux.mh (NATDEPFILES): Likewise. * config/i386/x86-64linux.mh (NATDEPFILES): Likewise. * config/ia64/linux.mh (NATDEPFILES): Likewise. * config/m68k/linux.mh (NATDEPFILES): Likewise. * config/mips/linux.mh (NATDEPFILES): Likewise. * config/powerpc/linux.mh (NATDEPFILES): Likewise. * config/s390/s390.mh (NATDEPFILES): Likewise. * config/sparc/linux.mh (NATDEPFILES): Likewise.
This commit is contained in:
Daniel Jacobowitz
176
gdb/linux-nat.c
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176
gdb/linux-nat.c
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/* GNU/Linux native-dependent code common to multiple platforms.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdb_wait.h"
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#include <sys/ptrace.h>
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/* If the system headers did not provide the constants, hard-code the normal
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values. */
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#ifndef PTRACE_EVENT_FORK
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_GETEVENTMSG 0x4201
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/* options set using PTRACE_SETOPTIONS */
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#define PTRACE_O_TRACESYSGOOD 0x00000001
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#define PTRACE_O_TRACEFORK 0x00000002
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#define PTRACE_O_TRACEVFORK 0x00000004
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#define PTRACE_O_TRACECLONE 0x00000008
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#define PTRACE_O_TRACEEXEC 0x00000010
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/* Wait extended result codes for the above trace options. */
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_EXEC 4
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#endif /* PTRACE_EVENT_FORK */
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/* We can't always assume that this flag is available, but all systems
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with the ptrace event handlers also have __WALL, so it's safe to use
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here. */
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#ifndef __WALL
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#define __WALL 0x40000000 /* Wait for any child. */
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#endif
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/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
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can not be used, 1 if it can. */
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static int linux_supports_tracefork_flag = -1;
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/* A helper function for linux_test_for_tracefork, called after fork (). */
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static void
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linux_tracefork_child (void)
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{
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int ret;
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ptrace (PTRACE_TRACEME, 0, 0, 0);
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kill (getpid (), SIGSTOP);
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fork ();
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exit (0);
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}
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/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. We
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create a child process, attach to it, use PTRACE_SETOPTIONS to enable
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fork tracing, and let it fork. If the process exits, we assume that
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we can't use TRACEFORK; if we get the fork notification, and we can
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extract the new child's PID, then we assume that we can. */
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static void
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linux_test_for_tracefork (void)
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{
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int child_pid, ret, status;
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long second_pid;
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child_pid = fork ();
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if (child_pid == -1)
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perror_with_name ("linux_test_for_tracefork: fork");
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if (child_pid == 0)
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linux_tracefork_child ();
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ret = waitpid (child_pid, &status, 0);
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if (ret == -1)
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perror_with_name ("linux_test_for_tracefork: waitpid");
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else if (ret != child_pid)
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error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
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if (! WIFSTOPPED (status))
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error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
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linux_supports_tracefork_flag = 0;
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
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if (ret != 0)
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{
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ptrace (PTRACE_KILL, child_pid, 0, 0);
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waitpid (child_pid, &status, 0);
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return;
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}
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ptrace (PTRACE_CONT, child_pid, 0, 0);
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ret = waitpid (child_pid, &status, 0);
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if (ret == child_pid && WIFSTOPPED (status)
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&& status >> 16 == PTRACE_EVENT_FORK)
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{
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second_pid = 0;
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ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
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if (ret == 0 && second_pid != 0)
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{
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int second_status;
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linux_supports_tracefork_flag = 1;
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waitpid (second_pid, &second_status, 0);
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ptrace (PTRACE_DETACH, second_pid, 0, 0);
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}
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}
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if (WIFSTOPPED (status))
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{
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ptrace (PTRACE_DETACH, child_pid, 0, 0);
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waitpid (child_pid, &status, 0);
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}
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}
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/* Return non-zero iff we have tracefork functionality available.
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This function also sets linux_supports_tracefork_flag. */
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static int
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linux_supports_tracefork (void)
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{
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if (linux_supports_tracefork_flag == -1)
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linux_test_for_tracefork ();
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return linux_supports_tracefork_flag;
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}
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int
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child_insert_fork_catchpoint (int pid)
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{
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if (linux_supports_tracefork ())
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error ("Fork catchpoints have not been implemented yet.");
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else
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error ("Your system does not support fork catchpoints.");
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}
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int
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child_insert_vfork_catchpoint (int pid)
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{
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if (linux_supports_tracefork ())
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error ("Vfork catchpoints have not been implemented yet.");
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else
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error ("Your system does not support vfork catchpoints.");
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}
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int
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child_insert_exec_catchpoint (int pid)
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{
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if (linux_supports_tracefork ())
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error ("Exec catchpoints have not been implemented yet.");
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else
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error ("Your system does not support exec catchpoints.");
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}
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