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https://git.proxmox.com/git/qemu-server
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136 lines
2.4 KiB
C
136 lines
2.4 KiB
C
/*
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Copyright (C) 2007-2009 Proxmox Server Solutions GmbH
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Copyright: vzdump is under GNU GPL, the GNU General Public License.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 dated June, 1991.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301, USA.
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Author: Dietmar Maurer <dietmar@proxmox.com>
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*/
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <signal.h>
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/* Set a signal handler */
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static void
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setsig (struct sigaction *sa, int sig, void (*fun)(int), int flags)
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{
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sa->sa_handler = fun;
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sa->sa_flags = flags;
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sigemptyset(&sa->sa_mask);
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sigaction(sig, sa, NULL);
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}
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int
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block_is_zero (char const *buffer, size_t size)
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{
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while (size--)
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if (*buffer++)
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return 0;
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return 1;
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}
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ssize_t
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safe_read(int fd, char *buf, size_t count)
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{
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ssize_t n;
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do {
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n = read(fd, buf, count);
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} while (n < 0 && errno == EINTR);
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return n;
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}
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int
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full_read(int fd, char *buf, size_t len)
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{
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size_t n;
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size_t total;
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total = 0;
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while (len > 0) {
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n = safe_read(fd, buf, len);
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if (n == 0)
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return total;
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if (n < 0)
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break;
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buf += n;
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total += n;
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len -= n;
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}
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if (len) {
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fprintf (stderr, "ERROR: incomplete read detected\n");
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exit (-1);
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}
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return total;
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}
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ssize_t
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safe_write(int fd, char *buf, size_t count)
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{
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ssize_t n;
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do {
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n = write(fd, buf, count);
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} while (n < 0 && errno == EINTR);
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return n;
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}
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int
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full_write(int fd, char *buf, size_t len)
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{
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size_t n;
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size_t total;
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total = 0;
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while (len > 0) {
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n = safe_write(fd, buf, len);
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if (n < 0)
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break;
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buf += n;
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total += n;
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len -= n;
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}
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if (len) {
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fprintf (stderr, "ERROR: incomplete write detected\n");
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exit (-1);
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}
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return total;
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}
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