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/*
* sb_write.c
*
* IO functions.
*
* Copyright 1999-2006 Gentoo Foundation
*
*
* 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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Header$
*/
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "sbutil.h"
/* General purpose function to _reliably_ read from a file.
*
* Returns total read bytes or -1 on error.
*/
size_t sb_read(int fd, void *buf, size_t count)
{
ssize_t n;
size_t accum = 0;
do {
n = read(fd, buf + accum, count - accum);
if (n > 0) {
accum += n;
continue;
}
if (n < 0) {
if (EINTR == errno) {
/* Reset errno to not trigger DBG_MSG */
errno = 0;
continue;
}
DBG_MSG("Failed to read from fd=%i!\n", fd);
return -1;
}
/* Found EOF */
break;
} while (accum < count);
return accum;
}
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