/*
 * Execute and wait for external command
 */
int exec_cmd(struct cmd_context *cmd, const char *const argv[], int *rstatus)
{
	pid_t pid;
	int status;
	char buf[PATH_MAX * 2];

	log_verbose("Executing: %s", _verbose_args(argv, buf, sizeof(buf)));

	if ((pid = fork()) == -1) {
		log_error("fork failed: %s", strerror(errno));
		return 0;
	}

	if (!pid) {
		/* Child */
		reset_locking();
		dev_close_all();
		/* FIXME Fix effect of reset_locking on cache then include this */
		/* destroy_toolcontext(cmd); */
		/* FIXME Use execve directly */
		execvp(argv[0], (char **const) argv);
		log_sys_error("execvp", argv[0]);
		_exit(errno);
	}

	if (rstatus)
		*rstatus = -1;

	/* Parent */
	if (wait4(pid, &status, 0, NULL) != pid) {
		log_error("wait4 child process %u failed: %s", pid,
			  strerror(errno));
		return 0;
	}

	if (!WIFEXITED(status)) {
		log_error("Child %u exited abnormally", pid);
		return 0;
	}

	if (WEXITSTATUS(status)) {
		if (rstatus) {
			*rstatus = WEXITSTATUS(status);
			log_verbose("%s failed: %u", argv[0], *rstatus);
		} else
			log_error("%s failed: %u", argv[0], WEXITSTATUS(status));
		return 0;
	}

	if (rstatus)
		*rstatus = 0;

	return 1;
}
Example #2
0
static struct volume_group *_get_vg(struct cmd_context *cmd, const char *vgname)
{
	dev_close_all();

	return vg_read_for_update(cmd, vgname, NULL, 0);
}