1 files changed, 121 insertions, 0 deletions
diff --git a/libiberty/pexecute.c b/libiberty/pexecute.c
new file mode 100644
index 00000000000..df061107cf3
--- /dev/null
+++ b/libiberty/pexecute.c
@@ -0,0 +1,121 @@
+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+   with other subprocesses), and wait for it.
+   Copyright (C) 2004 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.  */
+
+/* pexecute is an old routine.  This implementation uses the newer
+   pex_init/pex_run/pex_get_status/pex_free routines.  Don't use
+   pexecute in new code.  Use the newer routines instead.  */
+
+#include "config.h"
+#include "libiberty.h"
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+/* We only permit a single pexecute chain to execute at a time.  This
+   was always true anyhow, though it wasn't documented.  */
+
+static struct pex_obj *pex;
+static int idx;
+
+int
+pexecute (const char *program, char * const *argv, const char *pname,
+	  const char *temp_base, char **errmsg_fmt, char **errmsg_arg,
+	  int flags)
+{
+  const char *errmsg;
+  int err;
+
+  if ((flags & PEXECUTE_FIRST) != 0)
+    {
+      if (pex != NULL)
+	{
+	  *errmsg_fmt = "pexecute already in progress";
+	  *errmsg_arg = NULL;
+	  return -1;
+	}
+      pex = pex_init (PEX_USE_PIPES, pname, temp_base);
+      idx = 0;
+    }
+  else
+    {
+      if (pex == NULL)
+	{
+	  *errmsg_fmt = "pexecute not in progress";
+	  *errmsg_arg = NULL;
+	  return -1;
+	}
+    }
+
+  errmsg = pex_run (pex,
+		    (((flags & PEXECUTE_LAST) != 0 ? PEX_LAST : 0)
+		     | ((flags & PEXECUTE_SEARCH) != 0 ? PEX_SEARCH : 0)),
+		    program, argv, NULL, NULL, &err);
+  if (errmsg != NULL)
+    {
+      *errmsg_fmt = (char *) errmsg;
+      *errmsg_arg = NULL;
+      return -1;
+    }
+
+  /* Instead of a PID, we just return a one-based index into the
+     status values.  We avoid zero just because the old pexecute would
+     never return it.  */
+  return ++idx;
+}
+
+int
+pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
+{
+  /* The PID returned by pexecute is one-based.  */
+  --pid;
+
+  if (pex == NULL || pid < 0 || pid >= idx)
+    return -1;
+
+  if (pid == 0 && idx == 1)
+    {
+      if (!pex_get_status (pex, 1, status))
+	return -1;
+    }
+  else
+    {
+      int *vector;
+
+      vector = xmalloc (idx * sizeof (int));
+      if (!pex_get_status (pex, idx, vector))
+	return -1;
+      *status = vector[pid];
+      free (vector);
+    }
+
+  /* Assume that we are done after the caller has retrieved the last
+     exit status.  The original implementation did not require that
+     the exit statuses be retrieved in order, but this implementation
+     does.  */
+  if (pid + 1 == idx)
+    {
+      pex_free (pex);
+      pex = NULL;
+      idx = 0;
+    }
+
+  return pid + 1;
+}