GDB 7.6.50

gdb/nat/linux-waitpid.c

Index: gdb/nat/linux-waitpid.c
diff --git a/gdb/nat/linux-waitpid.c b/gdb/nat/linux-waitpid.c
new file mode 100644
index 0000000000000000000000000000000000000000..2debea488758d7722fbe148b873c883d38672d78
--- /dev/null
+++ b/gdb/nat/linux-waitpid.c
@@ -0,0 +1,120 @@
+/* Wrapper implementation for waitpid for GNU/Linux (LWP layer).
+
+   Copyright (C) 2001-2013 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 "signal.h"
+#endif
+
+#include "nat/linux-nat.h"
+#include "nat/linux-waitpid.h"
+#include "gdb_wait.h"
+
+/* Print debugging output based on the format string FORMAT and
+   its parameters.  */
+
+static inline void
+linux_debug (const char *format, ...)
+{
+#ifdef GDBSERVER
+  if (debug_threads)
+    {
+      va_list args;
+      va_start (args, format);
+      vfprintf (stderr, format, args);
+      fprintf (stderr, "\n");
+      va_end (args);
+    }
+#else
+  /* GDB-specific debugging output.  */
+#endif
+}
+
+/* Wrapper function for waitpid which handles EINTR, and emulates
+   __WALL for systems where that is not available.  */
+
+int
+my_waitpid (int pid, int *status, int flags)
+{
+  int ret, out_errno;
+
+  linux_debug ("my_waitpid (%d, 0x%x)\n", pid, flags);
+
+  if (flags & __WALL)
+    {
+      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);
+    }
+  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);
+
+  errno = out_errno;
+  return ret;
+}