141 lines
3.6 KiB
C
141 lines
3.6 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. Generic MSDOS specialization.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
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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., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "pex-common.h"
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#include <stdio.h>
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#include <errno.h>
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#ifdef NEED_DECLARATION_ERRNO
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extern int errno;
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#include "safe-ctype.h"
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#include <process.h>
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/* MSDOS doesn't multitask, but for the sake of a consistent interface
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the code behaves like it does. pexecute runs the program, tucks the
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exit code away, and returns a "pid". pwait must be called to fetch the
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exit code. */
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/* For communicating information from pexecute to pwait. */
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static int last_pid = 0;
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static int last_status = 0;
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static int last_reaped = 0;
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int
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pexecute (const char *program, char * const *argv, const char *this_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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int rc;
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char *scmd, *rf;
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FILE *argfile;
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int i, el = flags & PEXECUTE_SEARCH ? 4 : 0;
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last_pid++;
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if (last_pid < 0)
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last_pid = 1;
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if ((flags & PEXECUTE_ONE) != PEXECUTE_ONE)
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abort ();
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if (temp_base == 0)
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temp_base = choose_temp_base ();
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scmd = (char *) xmalloc (strlen (program) + strlen (temp_base) + 6 + el);
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rf = scmd + strlen(program) + 2 + el;
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sprintf (scmd, "%s%s @%s.gp", program,
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(flags & PEXECUTE_SEARCH ? ".exe" : ""), temp_base);
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argfile = fopen (rf, "w");
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if (argfile == 0)
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{
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int errno_save = errno;
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free (scmd);
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errno = errno_save;
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*errmsg_fmt = "cannot open `%s.gp'";
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*errmsg_arg = temp_base;
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return -1;
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}
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for (i=1; argv[i]; i++)
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{
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char *cp;
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for (cp = argv[i]; *cp; cp++)
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{
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if (*cp == '"' || *cp == '\'' || *cp == '\\' || ISSPACE (*cp))
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fputc ('\\', argfile);
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fputc (*cp, argfile);
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}
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fputc ('\n', argfile);
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}
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fclose (argfile);
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rc = system (scmd);
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{
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int errno_save = errno;
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remove (rf);
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free (scmd);
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errno = errno_save;
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}
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if (rc == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = (char *)program;
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return -1;
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}
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/* Tuck the status away for pwait, and return a "pid". */
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last_status = rc << 8;
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return last_pid;
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}
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/* Use ECHILD if available, otherwise use EINVAL. */
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#ifdef ECHILD
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#define PWAIT_ERROR ECHILD
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#else
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#define PWAIT_ERROR EINVAL
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#endif
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int
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pwait (int pid, int *status, int flags)
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{
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/* On MSDOS each pexecute must be followed by its associated pwait. */
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if (pid != last_pid
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/* Called twice for the same child? */
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|| pid == last_reaped)
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{
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errno = PWAIT_ERROR;
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return -1;
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}
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/* ??? Here's an opportunity to canonicalize the values in STATUS.
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Needed? */
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*status = last_status;
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last_reaped = last_pid;
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return last_pid;
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}
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