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staging: usbip: userspace: utils.c: rewrite modify_match_busid 

Rewrite the function to use libsysfs.

Signed-off-by: matt mooney <mfm@muteddisk.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
matt mooney 2011-06-19 22:44:41 -07:00 committed by Greg Kroah-Hartman
parent 42685d577f
commit 30f0554659
1 changed files with 41 additions and 29 deletions
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70
drivers/staging/usbip/userspace/src/utils.c
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@ -1,64 +1,76 @@
/*
* Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
* 2005-2007 Takahiro Hirofuchi
*
* Copyright (C) 2005-2007 Takahiro Hirofuchi
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <sysfs/libsysfs.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <libgen.h>
#include <unistd.h>
#include "usbip_common.h"
#include "utils.h"
int modify_match_busid(char *busid, int add)
{
int fd;
int ret;
char bus_type[] = "usb";
char attr_name[] = "match_busid";
char buff[SYSFS_BUS_ID_SIZE + 4];
char sysfs_mntpath[SYSFS_PATH_MAX];
char match_busid_path[SYSFS_PATH_MAX];
char match_busid_attr_path[SYSFS_PATH_MAX];
struct sysfs_attribute *match_busid_attr;
int rc, ret = 0;
ret = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX);
if (ret < 0) {
err("sysfs must be mounted");
return -1;
}
snprintf(match_busid_path, sizeof(match_busid_path),
"%s/%s/usb/%s/%s/match_busid", sysfs_mntpath, SYSFS_BUS_NAME,
SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME);
/* BUS_IS_SIZE includes NULL termination? */
if (strnlen(busid, SYSFS_BUS_ID_SIZE) > SYSFS_BUS_ID_SIZE - 1) {
dbg("busid is too long");
return -1;
}
fd = open(match_busid_path, O_WRONLY);
if (fd < 0)
rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX);
if (rc < 0) {
err("sysfs must be mounted: %s", strerror(errno));
return -1;
}
snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
"%s/%s/%s/%s/%s/%s", sysfs_mntpath, SYSFS_BUS_NAME, bus_type,
SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
match_busid_attr = sysfs_open_attribute(match_busid_attr_path);
if (!match_busid_attr) {
dbg("problem getting match_busid attribute: %s",
strerror(errno));
return -1;
}
if (add)
snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "add %s", busid);
else
snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "del %s", busid);
dbg("write \"%s\" to %s", buff, match_busid_path);
dbg("write \"%s\" to %s", buff, match_busid_attr->path);
ret = write(fd, buff, sizeof(buff));
if (ret < 0) {
close(fd);
return -1;
rc = sysfs_write_attribute(match_busid_attr, buff, sizeof(buff));
if (rc < 0) {
dbg("failed to write match_busid: %s", strerror(errno));
ret = -1;
}
close(fd);
sysfs_close_attribute(match_busid_attr);
return 0;
return ret;
}