125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
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with other subprocesses), and wait for it.
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Copyright (C) 2004-2020 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., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* pexecute is an old routine. This implementation uses the newer
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pex_init/pex_run/pex_get_status/pex_free routines. Don't use
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pexecute in new code. Use the newer routines instead. */
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#include "config.h"
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#include "libiberty.h"
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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/* We only permit a single pexecute chain to execute at a time. This
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was always true anyhow, though it wasn't documented. */
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static struct pex_obj *pex;
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static int idx;
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int
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pexecute (const char *program, char * const *argv, const char *pname,
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const char *temp_base, char **errmsg_fmt, char **errmsg_arg,
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int flags)
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{
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const char *errmsg;
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int err;
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if ((flags & PEXECUTE_FIRST) != 0)
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{
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if (pex != NULL)
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{
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*errmsg_fmt = (char *) "pexecute already in progress";
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*errmsg_arg = NULL;
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return -1;
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}
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pex = pex_init (PEX_USE_PIPES, pname, temp_base);
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idx = 0;
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}
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else
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{
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if (pex == NULL)
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{
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*errmsg_fmt = (char *) "pexecute not in progress";
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*errmsg_arg = NULL;
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return -1;
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}
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}
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errmsg = pex_run (pex,
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(((flags & PEXECUTE_LAST) != 0 ? PEX_LAST : 0)
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| ((flags & PEXECUTE_SEARCH) != 0 ? PEX_SEARCH : 0)),
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program, argv, NULL, NULL, &err);
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if (errmsg != NULL)
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{
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*errmsg_fmt = (char *) errmsg;
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*errmsg_arg = NULL;
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return -1;
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}
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/* Instead of a PID, we just return a one-based index into the
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status values. We avoid zero just because the old pexecute would
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never return it. */
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return ++idx;
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}
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int
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pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
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{
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/* The PID returned by pexecute is one-based. */
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--pid;
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if (pex == NULL || pid < 0 || pid >= idx)
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return -1;
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if (pid == 0 && idx == 1)
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{
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if (!pex_get_status (pex, 1, status))
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return -1;
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}
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else
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{
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int *vector;
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vector = XNEWVEC (int, idx);
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if (!pex_get_status (pex, idx, vector))
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{
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free (vector);
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return -1;
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}
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*status = vector[pid];
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free (vector);
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}
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/* Assume that we are done after the caller has retrieved the last
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exit status. The original implementation did not require that
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the exit statuses be retrieved in order, but this implementation
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does. */
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if (pid + 1 == idx)
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{
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pex_free (pex);
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pex = NULL;
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idx = 0;
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}
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return pid + 1;
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}
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