Linux Kernel  3.7.1
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utils.c
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1 /*
2  * Copyright (C) 2011 matt mooney <[email protected]>
3  * 2005-2007 Takahiro Hirofuchi
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <sysfs/libsysfs.h>
20 
21 #include <errno.h>
22 #include <stdio.h>
23 #include <string.h>
24 
25 #include "usbip_common.h"
26 #include "utils.h"
27 
28 int modify_match_busid(char *busid, int add)
29 {
30  char bus_type[] = "usb";
31  char attr_name[] = "match_busid";
32  char buff[SYSFS_BUS_ID_SIZE + 4];
33  char sysfs_mntpath[SYSFS_PATH_MAX];
34  char match_busid_attr_path[SYSFS_PATH_MAX];
35  struct sysfs_attribute *match_busid_attr;
36  int rc, ret = 0;
37 
38  if (strnlen(busid, SYSFS_BUS_ID_SIZE) > SYSFS_BUS_ID_SIZE - 1) {
39  dbg("busid is too long");
40  return -1;
41  }
42 
43  rc = sysfs_get_mnt_path(sysfs_mntpath, SYSFS_PATH_MAX);
44  if (rc < 0) {
45  err("sysfs must be mounted: %s", strerror(errno));
46  return -1;
47  }
48 
49  snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
50  "%s/%s/%s/%s/%s/%s", sysfs_mntpath, SYSFS_BUS_NAME, bus_type,
51  SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME, attr_name);
52 
53  match_busid_attr = sysfs_open_attribute(match_busid_attr_path);
54  if (!match_busid_attr) {
55  dbg("problem getting match_busid attribute: %s",
56  strerror(errno));
57  return -1;
58  }
59 
60  if (add)
61  snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "add %s", busid);
62  else
63  snprintf(buff, SYSFS_BUS_ID_SIZE + 4, "del %s", busid);
64 
65  dbg("write \"%s\" to %s", buff, match_busid_attr->path);
66 
67  rc = sysfs_write_attribute(match_busid_attr, buff, sizeof(buff));
68  if (rc < 0) {
69  dbg("failed to write match_busid: %s", strerror(errno));
70  ret = -1;
71  }
72 
73  sysfs_close_attribute(match_busid_attr);
74 
75  return ret;
76 }