Function cbm_subprocess_spawn_posix

src/foundation/subprocess.c:1154–1258

#endif

static int cbm_subprocess_spawn_posix(cbm_subprocess_t *process) {
    int input_flags = O_RDONLY;
#ifdef O_CLOEXEC
    input_flags |= O_CLOEXEC;
#endif
    int input = cbm_posix_fd_at_least_three(open("/dev/null", input_flags));
    const char *target = process->log_file ? process->log_file : "/dev/null";
    int output_flags = O_WRONLY | O_CREAT | O_TRUNC;
#ifdef O_CLOEXEC
    output_flags |= O_CLOEXEC;
#endif
#ifdef O_NOFOLLOW
    output_flags |= O_NOFOLLOW;
#endif
    int output = cbm_posix_fd_at_least_three(open(target, output_flags, 0600));
    if (input < 0 || output < 0) {
        if (input >= 0) {
            (void)close(input);
        }
        if (output >= 0) {
            (void)close(output);
        }
        return -1;
    }
    struct stat output_status;
    if (fstat(output, &output_status) != 0 ||
        (process->log_file && !S_ISREG(output_status.st_mode))) {
        (void)close(input);
        (void)close(output);
        return -1;
    }
    if (process->log_file && fchmod(output, 0600) != 0) {
        (void)close(input);
        (void)close(output);
        return -1;
    }

    long max_fd = sysconf(_SC_OPEN_MAX);
    if (max_fd < 0 || max_fd > 1048576L) {
        max_fd = 65536L;
    }

    pid_t pid = -1;
#ifdef __APPLE__
    int spawn_rc = cbm_posix_spawn_apple(process, input, output, &pid);
    for (int attempt = 0; spawn_rc == CBM_SPAWN_RETRY && attempt < CBM_SPAWN_RETRY_ATTEMPTS;
         attempt++) {
        cbm_spawn_backoff(attempt);
        spawn_rc = cbm_posix_spawn_apple(process, input, output, &pid);
    }
    if (spawn_rc == CBM_SPAWN_RETRY) {
        spawn_rc = -1; /* still exhausted after backoff: a real failure */
    }
    if (spawn_rc < 0) {
        (void)close(input);
        (void)close(output);
        return -1;
    }