| /* Utilities to execute a program in a subprocess (possibly linked by pipes |
| with other subprocesses), and wait for it. |
| Copyright (C) 2004-2017 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., 51 Franklin Street - Fifth Floor, |
| Boston, MA 02110-1301, 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 = (char *) "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 = (char *) "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 = XNEWVEC (int, idx); |
| if (!pex_get_status (pex, idx, vector)) |
| { |
| free (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; |
| } |