mirror of
https://github.com/FeralInteractive/gamemode.git
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135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/*
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Copyright (c) 2017-2018, Feral Interactive
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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 are met:
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* Redistributions of source code must retain the above copyright notice,
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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 Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN 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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*/
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#define _GNU_SOURCE
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#include "external-helper.h"
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#include "logging.h"
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#include <linux/limits.h>
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#include <stdio.h>
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#include <sys/wait.h>
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#include <unistd.h>
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/**
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* Call an external process
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*/
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int run_external_process(const char *const *exec_args)
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{
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pid_t p;
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int status = 0;
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if ((p = fork()) < 0) {
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LOG_ERROR("Failed to fork(): %s\n", strerror(errno));
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return false;
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} else if (p == 0) {
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/* Execute the command */
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/* Note about cast:
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* The statement about argv[] and envp[] being constants is
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* included to make explicit to future writers of language
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* bindings that these objects are completely constant.
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* http://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html
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*/
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if (execv(exec_args[0], (char *const *)exec_args) != 0) {
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LOG_ERROR("Failed to execute external process: %s %s\n", exec_args[0], strerror(errno));
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exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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}
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if (waitpid(p, &status, 0) < 0) {
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LOG_ERROR("Failed to waitpid(%d): %s\n", (int)p, strerror(errno));
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return -1;
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}
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/* i.e. sigsev */
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if (!WIFEXITED(status)) {
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LOG_ERROR("Child process '%s' exited abnormally\n", exec_args[0]);
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} else if (WEXITSTATUS(status) != 0) {
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LOG_ERROR("External process failed\n");
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return -1;
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}
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return 0;
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}
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/**
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* Call an external process and get output
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*/
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int run_external_process_get_output(const char *const *exec_args, char buffer[EXTERNAL_BUFFER_MAX])
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{
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pid_t p;
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int status = 0;
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int pipes[2];
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if (pipe(pipes) == -1) {
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LOG_ERROR("Could not create pipe: %s!\n", strerror(errno));
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return -1;
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}
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if ((p = fork()) < 0) {
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LOG_ERROR("Failed to fork(): %s\n", strerror(errno));
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return false;
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} else if (p == 0) {
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/* Send STDOUT to the pipe */
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dup2(pipes[1], STDOUT_FILENO);
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close(pipes[0]);
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close(pipes[1]);
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/* Launch the process */
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if (execv(exec_args[0], (char *const *)exec_args) != 0) {
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LOG_ERROR("Failed to execute external process %s: %s\n", exec_args[0], strerror(errno));
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exit(EXIT_FAILURE);
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}
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_exit(EXIT_SUCCESS);
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}
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close(pipes[1]);
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if (read(pipes[0], buffer, EXTERNAL_BUFFER_MAX) < 0) {
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LOG_ERROR("Failed to read from process %s: %s\n", exec_args[0], strerror(errno));
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return -1;
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}
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if (waitpid(p, &status, 0) < 0) {
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LOG_ERROR("Failed to waitpid(%d): %s\n", (int)p, strerror(errno));
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return -1;
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}
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/* i.e. sigsev */
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if (!WIFEXITED(status)) {
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LOG_ERROR("Child process '%s' exited abnormally\n", exec_args[0]);
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} else if (WEXITSTATUS(status) != 0) {
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LOG_ERROR("External process failed\n");
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return -1;
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}
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return 0;
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}
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