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