| /* 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; |
| } |