| 1 | /* Utilities to execute a program in a subprocess (possibly linked by pipes
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| 2 | with other subprocesses), and wait for it. Generic Unix version
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| 3 | (also used for UWIN and VMS).
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| 4 | Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
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| 5 | Free Software Foundation, Inc.
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| 6 |
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| 7 | This file is part of the libiberty library.
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| 8 | Libiberty is free software; you can redistribute it and/or
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| 9 | modify it under the terms of the GNU Library General Public
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| 10 | License as published by the Free Software Foundation; either
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| 11 | version 2 of the License, or (at your option) any later version.
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| 12 |
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| 13 | Libiberty is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 16 | Library General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU Library General Public
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| 19 | License along with libiberty; see the file COPYING.LIB. If not,
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| 20 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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| 21 | Boston, MA 02111-1307, USA. */
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| 22 |
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| 23 | #include "pex-common.h"
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| 24 |
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| 25 | #include <stdio.h>
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| 26 | #include <errno.h>
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| 27 | #ifdef NEED_DECLARATION_ERRNO
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| 28 | extern int errno;
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| 29 | #endif
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| 30 | #ifdef HAVE_STRING_H
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| 31 | #include <string.h>
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| 32 | #endif
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| 33 | #ifdef HAVE_UNISTD_H
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| 34 | #include <unistd.h>
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| 35 | #endif
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| 36 | #ifdef HAVE_STDLIB_H
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| 37 | #include <stdlib.h>
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| 38 | #endif
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| 39 | #ifdef HAVE_SYS_WAIT_H
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| 40 | #include <sys/wait.h>
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| 41 | #endif
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| 42 |
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| 43 | #ifndef HAVE_WAITPID
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| 44 | #define waitpid(pid, status, flags) wait(status)
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| 45 | #endif
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| 46 |
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| 47 | extern int execv ();
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| 48 | extern int execvp ();
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| 49 |
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| 50 | int
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| 51 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
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| 52 | const char *program;
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| 53 | char * const *argv;
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| 54 | const char *this_pname;
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| 55 | const char *temp_base ATTRIBUTE_UNUSED;
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| 56 | char **errmsg_fmt, **errmsg_arg;
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| 57 | int flags;
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| 58 | {
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| 59 | int (*func)() = (flags & PEXECUTE_SEARCH ? execvp : execv);
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| 60 | int pid;
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| 61 | int pdes[2];
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| 62 | int input_desc, output_desc;
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| 63 | int retries, sleep_interval;
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| 64 | /* Pipe waiting from last process, to be used as input for the next one.
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| 65 | Value is STDIN_FILE_NO if no pipe is waiting
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| 66 | (i.e. the next command is the first of a group). */
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| 67 | static int last_pipe_input;
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| 68 |
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| 69 | /* If this is the first process, initialize. */
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| 70 | if (flags & PEXECUTE_FIRST)
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| 71 | last_pipe_input = STDIN_FILE_NO;
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| 72 |
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| 73 | input_desc = last_pipe_input;
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| 74 |
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| 75 | /* If this isn't the last process, make a pipe for its output,
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| 76 | and record it as waiting to be the input to the next process. */
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| 77 | if (! (flags & PEXECUTE_LAST))
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| 78 | {
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| 79 | if (pipe (pdes) < 0)
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| 80 | {
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| 81 | *errmsg_fmt = "pipe";
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| 82 | *errmsg_arg = NULL;
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| 83 | return -1;
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| 84 | }
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| 85 | output_desc = pdes[WRITE_PORT];
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| 86 | last_pipe_input = pdes[READ_PORT];
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| 87 | }
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| 88 | else
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| 89 | {
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| 90 | /* Last process. */
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| 91 | output_desc = STDOUT_FILE_NO;
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| 92 | last_pipe_input = STDIN_FILE_NO;
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| 93 | }
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| 94 |
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| 95 | /* Fork a subprocess; wait and retry if it fails. */
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| 96 | sleep_interval = 1;
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| 97 | pid = -1;
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