libbb/safe_write.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

#include "libbb.h"

ssize_t FAST_FUNC safe_write(int fd, const void *buf, size_t count)
{
	ssize_t n;

	for (;;) {
		n = write(fd, buf, count);
		if (n >= 0 || errno != EINTR)
			break;
		/* Some callers set errno=0, are upset when they see EINTR.
		 * Returning EINTR is wrong since we retry write(),
		 * the "error" was transient.
		 */
		errno = 0;
		/* repeat the write() */
	}

	return n;
}