mirror of git://gcc.gnu.org/git/gcc.git
133 lines
3.4 KiB
C
133 lines
3.4 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. Cygwin 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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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <process.h>
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#include <io.h>
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#include <fcntl.h>
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#include <signal.h>
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extern int _spawnv ();
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extern int _spawnvp ();
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/* Win32 supports pipes, and Cygwin provides waitpid. */
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int
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pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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const char *program;
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char * const *argv;
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const char *this_pname;
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const char *temp_base;
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char **errmsg_fmt, **errmsg_arg;
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int flags;
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{
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int pid;
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int pdes[2], org_stdin, org_stdout;
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int input_desc, output_desc;
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int retries, sleep_interval;
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/* Pipe waiting from last process, to be used as input for the next one.
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Value is STDIN_FILE_NO if no pipe is waiting
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(i.e. the next command is the first of a group). */
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static int last_pipe_input;
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/* If this is the first process, initialize. */
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if (flags & PEXECUTE_FIRST)
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last_pipe_input = STDIN_FILE_NO;
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input_desc = last_pipe_input;
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/* If this isn't the last process, make a pipe for its output,
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and record it as waiting to be the input to the next process. */
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if (! (flags & PEXECUTE_LAST))
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{
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if (_pipe (pdes, 256, O_BINARY) < 0)
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{
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*errmsg_fmt = "pipe";
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*errmsg_arg = NULL;
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return -1;
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}
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output_desc = pdes[WRITE_PORT];
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last_pipe_input = pdes[READ_PORT];
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}
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else
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{
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/* Last process. */
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output_desc = STDOUT_FILE_NO;
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last_pipe_input = STDIN_FILE_NO;
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}
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if (input_desc != STDIN_FILE_NO)
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{
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org_stdin = dup (STDIN_FILE_NO);
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dup2 (input_desc, STDIN_FILE_NO);
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close (input_desc);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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org_stdout = dup (STDOUT_FILE_NO);
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dup2 (output_desc, STDOUT_FILE_NO);
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close (output_desc);
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}
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pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
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(_P_NOWAIT, program, argv);
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if (input_desc != STDIN_FILE_NO)
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{
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dup2 (org_stdin, STDIN_FILE_NO);
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close (org_stdin);
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}
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if (output_desc != STDOUT_FILE_NO)
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{
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dup2 (org_stdout, STDOUT_FILE_NO);
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close (org_stdout);
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}
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if (pid == -1)
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{
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*errmsg_fmt = install_error_msg;
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*errmsg_arg = program;
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return -1;
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}
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return pid;
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}
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int
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pwait (pid, status, flags)
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int pid;
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int *status;
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int flags ATTRIBUTE_UNUSED;
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{
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return waitpid (pid, status, 0);
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}
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