sync-samples.h

/*
 * Copyright 2011, Red Hat, Inc.
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef SYNC_SAMPLES_H
#define SYNC_SAMPLES_H

#define USER_ERR 1
#define LIB_ERR  2
#define SYS_ERR  3
#define INTERNAL_ERR 4

static inline ssize_t
full_write(int fd, const char *buf, size_t len)
{
	ssize_t written = 0;
	size_t to_write = len;
	ssize_t ret;
	int got_zero = 0;

	while (to_write) {
		ret = write(fd, buf, to_write);
		switch (ret) {
		case 0:
			/* shouldn't happen, try again and see if
			 * an error is reported */
			if (got_zero)
				return written;
			got_zero = 1;
			continue;
		case -1:
			if (errno == EINTR)
				continue;
			return written ? written : -1;

		default:
			written += ret;
			to_write -= ret;
			buf += ret;
			break;
		}
	}

	return written;
}

#endif /* SYNC_SAMPLES_H */