A fast, lightweight and minimalistic Wayland terminal emulator
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#include "spawn.h"
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define LOG_MODULE "spawn"
#define LOG_ENABLE_DBG 0
#include "log.h"
bool
spawn(struct reaper *reaper, const char *cwd, char *const argv[],
int stdin_fd, int stdout_fd, int stderr_fd)
{
int pipe_fds[2] = {-1, -1};
if (pipe2(pipe_fds, O_CLOEXEC) < 0) {
LOG_ERRNO("failed to create pipe");
goto err;
}
pid_t pid = fork();
if (pid < 0) {
LOG_ERRNO("failed to fork");
goto err;
}
if (pid == 0) {
/* Child */
close(pipe_fds[0]);
if ((stdin_fd >= 0 && (dup2(stdin_fd, STDIN_FILENO) < 0 || close(stdin_fd) < 0)) ||
(stdout_fd >= 0 && (dup2(stdout_fd, STDOUT_FILENO) < 0 || close(stdout_fd) < 0)) ||
(stderr_fd >= 0 && (dup2(stderr_fd, STDERR_FILENO) < 0 || close(stderr_fd) < 0)) ||
(cwd != NULL && chdir(cwd) < 0) ||
execvp(argv[0], argv) < 0)
{
(void)!write(pipe_fds[1], &errno, sizeof(errno));
_exit(errno);
}
assert(false);
_exit(errno);
}
/* Parent */
close(pipe_fds[1]);
int _errno;
static_assert(sizeof(_errno) == sizeof(errno), "errno size mismatch");
ssize_t ret = read(pipe_fds[0], &_errno, sizeof(_errno));
close(pipe_fds[0]);
if (ret == 0) {
reaper_add(reaper, pid);
return true;
} else if (ret < 0) {
LOG_ERRNO("failed to read from pipe");
return false;
} else {
LOG_ERRNO_P(_errno, "%s: failed to spawn", argv[0]);
errno = _errno;
waitpid(pid, NULL, 0);
return false;
}
err:
if (pipe_fds[0] != -1)
close(pipe_fds[0]);
if (pipe_fds[1] != -1)
close(pipe_fds[1]);
return false;
}