tools/usb/usbip/src/utils.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
   4  *               2005-2007 Takahiro Hirofuchi
   5  */
   6
   7 #include <errno.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10
  11 #include "usbip_common.h"
  12 #include "utils.h"
  13 #include "sysfs_utils.h"
  14
  15 int modify_match_busid(char *busid, int add)
  16 {
  17         char attr_name[] = "match_busid";
  18         char command[SYSFS_BUS_ID_SIZE + 4];
  19         char match_busid_attr_path[SYSFS_PATH_MAX];
  20         int rc;
  21         int cmd_size;
  22
  23         snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
  24                  "%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME,
  25                  SYSFS_BUS_TYPE, SYSFS_DRIVERS_NAME, USBIP_HOST_DRV_NAME,
  26                  attr_name);
  27
  28         if (add)
  29                 cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s",
  30                                     busid);
  31         else
  32                 cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s",
  33                                     busid);
  34
  35         rc = write_sysfs_attribute(match_busid_attr_path, command,
  36                                    cmd_size);
  37         if (rc < 0) {
  38                 dbg("failed to write match_busid: %s", strerror(errno));
  39                 return -1;
  40         }
  41
  42         return 0;
  43 }