mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 18:21:39 +01:00
Olaf Hering
f67baf4ff5
Catch lseek() errors. Use -1 as return value and let caller read errno. Remove const casts from buffer pointers, the page is writeable. Use wrapper for write() which matches the read() prototype. Remove unused stdarg.h inclusion. Remove unused macro. Signed-off-by: Olaf Hering <olaf@aepfle.de> Committed-by: Ian Jackson <ian.jackson.citrix.com>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/******************************************************************************
|
|
*
|
|
* Common file operations.
|
|
*
|
|
* Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp)
|
|
*
|
|
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
|
|
#include <unistd.h>
|
|
#include <xc_private.h>
|
|
|
|
static int file_op(int fd, void *page, int i,
|
|
ssize_t (*fn)(int, void *, size_t))
|
|
{
|
|
off_t seek_ret;
|
|
int total = 0;
|
|
int bytes;
|
|
|
|
seek_ret = lseek(fd, i << PAGE_SHIFT, SEEK_SET);
|
|
if ( seek_ret == (off_t)-1 )
|
|
return -1;
|
|
|
|
while ( total < PAGE_SIZE )
|
|
{
|
|
bytes = fn(fd, page + total, PAGE_SIZE - total);
|
|
if ( bytes <= 0 )
|
|
return -1;
|
|
|
|
total += bytes;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t my_write(int fd, void *buf, size_t count)
|
|
{
|
|
return write(fd, buf, count);
|
|
}
|
|
|
|
int read_page(int fd, void *page, int i)
|
|
{
|
|
return file_op(fd, page, i, &read);
|
|
}
|
|
|
|
int write_page(int fd, void *page, int i)
|
|
{
|
|
return file_op(fd, page, i, &my_write);
|
|
}
|
|
|
|
|
|
/*
|
|
* Local variables:
|
|
* mode: C
|
|
* c-set-style: "BSD"
|
|
* c-basic-offset: 4
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*/
|