mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* 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;
|
|
}
|