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/*
* (c) 2005 Andrew Warfield and Julian Chesterfield
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "tapdisk-dispatch.h"
int
strsep_len(const char *str, char c, unsigned int len)
{
unsigned int i;
for (i = 0; str[i]; i++)
if (str[i] == c) {
if (len == 0)
return i;
len--;
}
return (len == 0) ? i : -ERANGE;
}
int
make_blktap_device(char *devname, int major, int minor, int perm)
{
int err;
err = unlink(devname);
if (err && errno != ENOENT) {
EPRINTF("unlink %s failed: %d\n", devname, errno);
return -errno;
}
/* Need to create device */
err = mkdir(BLKTAP_DEV_DIR, 0755);
if (err && errno != EEXIST) {
EPRINTF("Failed to create %s directory\n", BLKTAP_DEV_DIR);
return -errno;
}
err = mknod(devname, perm, makedev(major, minor));
if (err) {
int ret = -errno;
struct stat st;
EPRINTF("mknod %s failed: %d\n", devname, -errno);
err = lstat(devname, &st);
if (err) {
DPRINTF("lstat %s failed: %d\n", devname, -errno);
err = access(devname, F_OK);
if (err)
DPRINTF("access %s failed: %d\n", devname, -errno);
else
DPRINTF("access %s succeeded\n", devname);
} else
DPRINTF("lstat %s: %u:%u\n", devname,
(unsigned int)st.st_rdev >> 8,
(unsigned int)st.st_rdev & 0xff);
return ret;
}
DPRINTF("Created %s device\n", devname);
return 0;
}
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