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/*
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* sbio.c
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*
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* IO functions.
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*
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* Copyright 1999-2006 Gentoo Foundation
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Header$
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "sbutil.h"
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static int (*sbio_open)(const char *, int, mode_t) = (void *)open;
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void sb_set_open(void *new_open)
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{
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if (!check_ptr(new_open))
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return;
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sbio_open = new_open;
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}
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/* General purpose function to _reliably_ open a file
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*
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* Returns the file descriptor or -1 on error (and errno set)
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*/
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int sb_open(const char *path, int flags, mode_t mode)
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{
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int fd;
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fd = sbio_open(path, flags, mode);
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if (-1 == fd)
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DBG_MSG("Failed to open file '%s'!\n", path);
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return fd;
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}
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/* General purpose function to _reliably_ read from a file.
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*
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* Returns total read bytes or -1 on error.
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*/
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size_t sb_read(int fd, void *buf, size_t count)
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{
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ssize_t n;
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size_t accum = 0;
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do {
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n = read(fd, buf + accum, count - accum);
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if (n > 0) {
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accum += n;
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continue;
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}
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if (n < 0) {
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if (EINTR == errno) {
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/* Reset errno to not trigger DBG_MSG */
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errno = 0;
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continue;
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}
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DBG_MSG("Failed to read from fd=%i!\n", fd);
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return -1;
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}
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/* Found EOF */
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break;
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} while (accum < count);
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return accum;
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}
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/* General purpose function to _reliably_ write to a file
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*
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* If returned value is less than count, there was a fatal
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* error and value tells how many bytes were actually written
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*/
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size_t sb_write(int fd, const void *buf, size_t count)
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{
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ssize_t n;
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size_t accum = 0;
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do {
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n = write(fd, buf + accum, count - accum);
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if (n < 0) {
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if (EINTR == errno) {
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/* Reset errno to not trigger DBG_MSG */
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errno = 0;
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continue;
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}
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DBG_MSG("Failed to write to fd=%i!\n", fd);
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break;
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}
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accum += n;
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} while (accum < count);
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return accum;
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}
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/* General purpose function to _reliably_ close a file
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*
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* Returns 0 if successful or negative number on error (and errno set)
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*/
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int sb_close(int fd)
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{
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int res;
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do {
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res = close(fd);
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} while ((res < 0) && (EINTR == errno));
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/* Do not care about errors here */
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errno = 0;
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return res;
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}
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