core-admin/common/ioall.c
Rafal Wojtczuk bd89fa0631 Move copy_all_fd from dvm_file_editor.c to ioall.c
It is useful in e.g. qfile-agent-dvm.
2011-03-11 11:57:16 +01:00

83 lines
1.8 KiB
C

/*
* The Qubes OS Project, http://www.qubes-os.org
*
* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
int write_all(int fd, void *buf, int size)
{
int written = 0;
int ret;
while (written < size) {
ret = write(fd, (char *) buf + written, size - written);
if (ret <= 0) {
perror("write");
return 0;
}
written += ret;
}
// fprintf(stderr, "sent %d bytes\n", size);
return 1;
}
int read_all(int fd, void *buf, int size)
{
int got_read = 0;
int ret;
while (got_read < size) {
ret = read(fd, (char *) buf + got_read, size - got_read);
if (ret == 0) {
fprintf(stderr, "EOF\n");
return 0;
}
if (ret < 0) {
perror("read");
return 0;
}
got_read += ret;
}
// fprintf(stderr, "read %d bytes\n", size);
return 1;
}
int copy_fd_all(int fdout, int fdin)
{
int ret;
char buf[4096];
for (;;) {
ret = read(fdin, buf, sizeof(buf));
if (!ret)
break;
if (ret < 0) {
perror("read");
return 0;
}
if (!write_all(fdout, buf, ret)) {
perror("write");
return 0;
}
}
return 1;
}