/* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
- Copyright (C) 2001-2014 Free Software Foundation, Inc.
+ Copyright (C) 2001-2019 Free Software Foundation, Inc.
This file is part of GDB.
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 "signal.h"
-#endif
+#include "gdbsupport/common-defs.h"
-#include "nat/linux-nat.h"
-#include "nat/linux-waitpid.h"
-#include "gdb_wait.h"
+#include "linux-nat.h"
+#include "linux-waitpid.h"
+#include "gdbsupport/gdb_wait.h"
-/* Print debugging output based on the format string FORMAT and
- its parameters. */
+/* Convert wait status STATUS to a string. Used for printing debug
+ messages only. */
-static inline void
-linux_debug (const char *format, ...)
+char *
+status_to_str (int status)
{
-#ifdef GDBSERVER
- if (debug_threads)
+ static char buf[64];
+
+ if (WIFSTOPPED (status))
{
- va_list args;
- va_start (args, format);
- vfprintf (stderr, format, args);
- fprintf (stderr, "\n");
- va_end (args);
+ if (WSTOPSIG (status) == SYSCALL_SIGTRAP)
+ snprintf (buf, sizeof (buf), "%s (stopped at syscall)",
+ strsignal (SIGTRAP));
+ else
+ snprintf (buf, sizeof (buf), "%s (stopped)",
+ strsignal (WSTOPSIG (status)));
}
-#else
- /* GDB-specific debugging output. */
-#endif
+ else if (WIFSIGNALED (status))
+ snprintf (buf, sizeof (buf), "%s (terminated)",
+ strsignal (WTERMSIG (status)));
+ else
+ snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
+
+ return buf;
}
-/* Wrapper function for waitpid which handles EINTR, and emulates
- __WALL for systems where that is not available. */
+/* See linux-waitpid.h. */
int
my_waitpid (int pid, int *status, int flags)
{
- int ret, out_errno;
+ int ret;
- linux_debug ("my_waitpid (%d, 0x%x)\n", pid, flags);
-
- if (flags & __WALL)
+ do
{
- sigset_t block_mask, org_mask, wake_mask;
- int wnohang;
-
- wnohang = (flags & WNOHANG) != 0;
- flags &= ~(__WALL | __WCLONE);
- flags |= WNOHANG;
-
- /* Block all signals while here. This avoids knowing about
- LinuxThread's signals. */
- sigfillset (&block_mask);
- sigprocmask (SIG_BLOCK, &block_mask, &org_mask);
-
- /* ... except during the sigsuspend below. */
- sigemptyset (&wake_mask);
-
- while (1)
- {
- /* Since all signals are blocked, there's no need to check
- for EINTR here. */
- ret = waitpid (pid, status, flags);
- out_errno = errno;
-
- if (ret == -1 && out_errno != ECHILD)
- break;
- else if (ret > 0)
- break;
-
- if (flags & __WCLONE)
- {
- /* We've tried both flavors now. If WNOHANG is set,
- there's nothing else to do, just bail out. */
- if (wnohang)
- break;
-
- linux_debug ("blocking\n");
-
- /* Block waiting for signals. */
- sigsuspend (&wake_mask);
- }
- flags ^= __WCLONE;
- }
-
- sigprocmask (SIG_SETMASK, &org_mask, NULL);
+ ret = waitpid (pid, status, flags);
}
- else
- {
- do
- ret = waitpid (pid, status, flags);
- while (ret == -1 && errno == EINTR);
- out_errno = errno;
- }
-
- linux_debug ("my_waitpid (%d, 0x%x): status(%x), %d\n",
- pid, flags, status ? *status : -1, ret);
+ while (ret == -1 && errno == EINTR);
- errno = out_errno;
return ret;
}