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child-process.c
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child-process.c
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/**
* JCUnit - a very simple unit testing framework for C
*
* Copyright (C) 2021-2022 Denis Korchagin <denis.korchagin.1995@gmail.com>
*
* This file is part of JCUnit
*
* For the full license information, please view the LICENSE
* file that was distributed with this source code.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation of version 2
* of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "headers/child-process.h"
#include "headers/errors.h"
#define PIPE_COUNT (2)
#define PIPE_STDOUT (0)
#define PIPE_STDERR (1)
#define PIPE_INPUT_FD (0)
#define PIPE_OUTPUT_FD (1)
static int pipes[PIPE_COUNT][2] = {0};
void child_process_run(const char * path, char * argv[], struct process_output * output, unsigned int mode)
{
pipe(pipes[PIPE_STDOUT]);
pipe(pipes[PIPE_STDERR]);
pid_t pid = fork();
if(pid < 0) {
jcunit_fatal_error("Cannot fork the child process: \"%s\"!", strerror(errno));
}
int pipe_index;
switch (mode) {
case RUN_MODE_CAPTURE_STDOUT:
pipe_index = PIPE_STDOUT;
break;
case RUN_MODE_CAPTURE_STDERR:
pipe_index = PIPE_STDERR;
break;
default:
jcunit_fatal_error("The unknown mode: %u", mode);
}
if (pid == 0) {
dup2(pipes[PIPE_STDOUT][PIPE_OUTPUT_FD], STDOUT_FILENO);
dup2(pipes[PIPE_STDERR][PIPE_OUTPUT_FD], STDERR_FILENO);
close(pipes[PIPE_STDOUT][PIPE_OUTPUT_FD]);
close(pipes[PIPE_STDOUT][PIPE_INPUT_FD]);
close(pipes[PIPE_STDERR][PIPE_OUTPUT_FD]);
close(pipes[PIPE_STDERR][PIPE_INPUT_FD]);
execv(path, argv);
exit(0);
}
wait(NULL);
close(pipes[PIPE_STDOUT][PIPE_OUTPUT_FD]);
close(pipes[PIPE_STDERR][PIPE_OUTPUT_FD]);
ssize_t nbytes = read(pipes[pipe_index][PIPE_INPUT_FD], output->buffer, output->size);
close(pipes[PIPE_STDOUT][PIPE_INPUT_FD]);
close(pipes[PIPE_STDERR][PIPE_INPUT_FD]);
if (nbytes < 0) {
output->error_code = ERROR_CODE_READ_CHILD_DATA;
return;
}
output->len = (unsigned int)nbytes;
}