Function update_scb

plugins/chanbackup.c:405–443

}

static void update_scb(struct plugin *p, struct modern_scb_chan **channels)
{

	/* If the temp file existed before, remove it */
	unlink_noerr("scb.tmp");

	int fd = open("scb.tmp", O_CREAT|O_EXCL|O_WRONLY, 0400);
	if (fd<0)
		plugin_err(p, "Opening: %s", strerror(errno));

	plugin_log(p, LOG_DBG, "Updating the SCB file...");

	write_scb(p, fd, channels);

	/* fsync (mostly!) ensures that the file has reached the disk. */
	if (fsync(fd) != 0) {
		unlink_noerr("scb.tmp");
	}

	/* This should never fail if fsync succeeded.  But paranoia good, and
	 * bugs exist. */
	if (close(fd) != 0) {
		unlink_noerr("scb.tmp");
	}
	/* We actually need to sync the *directory itself* to make sure the
	 * file exists!  You're only allowed to open directories read-only in
	 * modern Unix though. */
	fd = open(".", O_RDONLY);
	if (fd < 0) {
		plugin_log(p, LOG_DBG, "Opening: %s", strerror(errno));
	}
	if (fsync(fd) != 0) {
		unlink_noerr("scb.tmp");
	}
	close(fd);

	/* This will atomically replace the main file */
	rename("scb.tmp", FILENAME);
}


static struct command_result