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161 lines
5.0 KiB
161 lines
5.0 KiB
/**
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@file
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@ingroup util
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@brief Forks a command and sets up pipes to and from.
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@author Rick L Spickelmier
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@author Richard Rudell
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@copyright@parblock
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Copyright (c) 1994-1998 The Regents of the Univ. of California.
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All rights reserved.
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Permission is hereby granted, without written agreement and without license
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or royalty fees, to use, copy, modify, and distribute this software and its
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documentation for any purpose, provided that the above copyright notice and
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the following two paragraphs appear in all copies of this software.
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IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN
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"AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE
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MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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@endparblock
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@copyright@parblock
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Copyright (c) 1999-2015, Regents of the University of Colorado
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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Neither the name of the University of Colorado nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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@endparblock
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*/
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#include "config.h"
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#if HAVE_UNISTD_H == 1
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#define _POSIX_SOURCE
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#if HAVE_SYS_WAIT_H == 1
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#include <sys/wait.h>
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#endif
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/**
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* @def EXTERN
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* @brief Allows C linkage when compiling as C++.
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*/
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#ifndef EXTERN
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# ifdef __cplusplus
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# define EXTERN extern "C"
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# else
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# define EXTERN extern
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# endif
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#endif
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/**
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* @brief Forks a command and sets up pipes to and from.
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*
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* @return 1 for success, with toCommand and fromCommand pointing to
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* the streams; 0 for failure
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*/
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int
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util_pipefork(
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char * const *argv, /**< normal argv argument list */
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FILE **toCommand, /**< pointer to the sending stream */
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FILE **fromCommand, /**< pointer to the reading stream */
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int *pid /**< process ID */)
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{
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#if HAVE_SYS_WAIT_H == 1
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int forkpid, waitPid;
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int topipe[2], frompipe[2];
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char buffer[1024];
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int status;
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/* create the PIPES...
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* fildes[0] for reading from command
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* fildes[1] for writing to command
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*/
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if (pipe(topipe)) return(0);
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if (pipe(frompipe)) return(0);
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if ((forkpid = fork()) == 0) {
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/* child here, connect the pipes */
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(void) dup2(topipe[0], fileno(stdin));
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(void) dup2(frompipe[1], fileno(stdout));
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(void) close(topipe[0]);
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(void) close(topipe[1]);
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(void) close(frompipe[0]);
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(void) close(frompipe[1]);
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(void) execvp(argv[0], argv);
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(void) sprintf(buffer, "util_pipefork: can not exec %s", argv[0]);
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perror(buffer);
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(void) _exit(1);
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}
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if (pid) {
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*pid = forkpid;
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}
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waitPid = waitpid(-1, &status, WNOHANG);
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/* parent here, use fork() semantics to get return status */
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if (waitPid == forkpid && WIFEXITED(status)) {
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return 0;
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}
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if ((*toCommand = fdopen(topipe[1], "w")) == NULL) {
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return 0;
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}
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if ((*fromCommand = fdopen(frompipe[0], "r")) == NULL) {
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return 0;
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}
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(void) close(topipe[0]);
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(void) close(frompipe[1]);
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return 1;
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#else
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(void) argv; /* to avoid warning */
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(void) toCommand; /* to avoid warning */
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(void) fromCommand; /* to avoid warning */
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(void) pid; /* to avoid warning */
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(void) fprintf(stderr,
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"util_pipefork: not implemented on your operating system\n");
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return 0;
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#endif
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}
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