151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
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Copyright (C) 2001-2015 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#ifdef GDBSERVER
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/* FIXME: server.h is required for the definition of debug_threads
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which is used in the gdbserver-specific debug printing in
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linux_debug. This code should be made available to GDB also,
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but the lack of a suitable flag to enable it prevents this. */
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#include "server.h"
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#endif
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#include "linux-nat.h"
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#include "linux-waitpid.h"
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#include "gdb_wait.h"
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/* Print debugging output based on the format string FORMAT and
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its parameters. */
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static inline void
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linux_debug (const char *format, ...)
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{
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#ifdef GDBSERVER
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if (debug_threads)
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{
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va_list args;
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va_start (args, format);
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vfprintf (stderr, format, args);
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va_end (args);
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}
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#endif
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}
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/* Convert wait status STATUS to a string. Used for printing debug
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messages only. */
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char *
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status_to_str (int status)
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{
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static char buf[64];
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if (WIFSTOPPED (status))
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{
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if (WSTOPSIG (status) == SYSCALL_SIGTRAP)
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snprintf (buf, sizeof (buf), "%s (stopped at syscall)",
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strsignal (SIGTRAP));
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else
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snprintf (buf, sizeof (buf), "%s (stopped)",
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strsignal (WSTOPSIG (status)));
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}
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else if (WIFSIGNALED (status))
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snprintf (buf, sizeof (buf), "%s (terminated)",
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strsignal (WTERMSIG (status)));
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else
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snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
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return buf;
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}
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/* Wrapper function for waitpid which handles EINTR, and emulates
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__WALL for systems where that is not available. */
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int
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my_waitpid (int pid, int *status, int flags)
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{
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int ret, out_errno;
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linux_debug ("my_waitpid (%d, 0x%x)\n", pid, flags);
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if (flags & __WALL)
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{
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sigset_t block_mask, org_mask, wake_mask;
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int wnohang;
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wnohang = (flags & WNOHANG) != 0;
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flags &= ~(__WALL | __WCLONE);
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if (!wnohang)
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{
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flags |= WNOHANG;
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/* Block all signals while here. This avoids knowing about
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LinuxThread's signals. */
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sigfillset (&block_mask);
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sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
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/* ... except during the sigsuspend below. */
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sigemptyset (&wake_mask);
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}
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while (1)
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{
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/* Since all signals are blocked, there's no need to check
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for EINTR here. */
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ret = waitpid (pid, status, flags);
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out_errno = errno;
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if (ret == -1 && out_errno != ECHILD)
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break;
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else if (ret > 0)
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break;
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if (flags & __WCLONE)
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{
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/* We've tried both flavors now. If WNOHANG is set,
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there's nothing else to do, just bail out. */
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if (wnohang)
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break;
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linux_debug ("blocking\n");
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/* Block waiting for signals. */
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sigsuspend (&wake_mask);
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}
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flags ^= __WCLONE;
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}
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if (!wnohang)
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sigprocmask (SIG_SETMASK, &org_mask, NULL);
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}
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else
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{
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do
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ret = waitpid (pid, status, flags);
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while (ret == -1 && errno == EINTR);
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out_errno = errno;
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}
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linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
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pid, flags, status ? *status : -1, ret);
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errno = out_errno;
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return ret;
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}
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