merge from gcc

1 files changed, 103 insertions, 0 deletions

diff --git a/libiberty/pex-djgpp.c b/libiberty/pex-djgpp.c
new file mode 100644
index 00000000000..968e7841215
--- /dev/null
+++ b/libiberty/pex-djgpp.c
@@ -0,0 +1,103 @@
+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+   with other subprocesses), and wait for it.  DJGPP specialization.
+   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
+   Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#include "pex-common.h"
+
+#include <stdio.h>
+#include <errno.h>
+#ifdef NEED_DECLARATION_ERRNO
+extern int errno;
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#include <process.h>
+
+/* Use ECHILD if available, otherwise use EINVAL.  */
+#ifdef ECHILD
+#define PWAIT_ERROR ECHILD
+#else
+#define PWAIT_ERROR EINVAL
+#endif
+
+/* MSDOS doesn't multitask, but for the sake of a consistent interface
+   the code behaves like it does.  pexecute runs the program, tucks the
+   exit code away, and returns a "pid".  pwait must be called to fetch the
+   exit code.  */
+
+/* For communicating information from pexecute to pwait.  */
+static int last_pid = 0;
+static int last_status = 0;
+static int last_reaped = 0;
+
+int
+pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
+     const char *program;
+     char * const *argv;
+     const char *this_pname;
+     const char *temp_base;
+     char **errmsg_fmt, **errmsg_arg;
+     int flags;
+{
+  int rc;
+
+  last_pid++;
+  if (last_pid < 0)
+    last_pid = 1;
+
+  if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
+    abort ();
+
+  /* ??? What are the possible return values from spawnv?  */
+  rc = (flags & PEXECUTE_SEARCH ? spawnvp : spawnv) (P_WAIT, program, argv);
+
+  if (rc == -1)
+    {
+      *errmsg_fmt = install_error_msg;
+      *errmsg_arg = (char *)program;
+      return -1;
+    }
+
+  /* Tuck the status away for pwait, and return a "pid".  */
+  last_status = rc << 8;
+  return last_pid;
+}
+
+int
+pwait (pid, status, flags)
+     int pid;
+     int *status;
+     int flags;
+{
+  /* On MSDOS each pexecute must be followed by its associated pwait.  */
+  if (pid != last_pid
+      /* Called twice for the same child?  */
+      || pid == last_reaped)
+    {
+      errno = PWAIT_ERROR;
+      return -1;
+    }
+  /* ??? Here's an opportunity to canonicalize the values in STATUS.
+     Needed?  */
+  *status = (last_status >> 8);
+  last_reaped = last_pid;
+  return last_pid;
+}