/* 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; }