mkdev.c

  1 /*
  2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
  3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU Lesser General Public License version 2.1
  7  * as published by the Free Software Foundation
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  */
 14 
 15 #define _DEFAULT_SOURCE
 16 
 17 #include <sys/stat.h>
 18 #include <sys/types.h>
 19 #include <sys/sysmacros.h>
 20 
 21 #include <stdio.h>
 22 #include <string.h>
 23 #include <stdlib.h>
 24 #include <unistd.h>
 25 #include <stdbool.h>
 26 #include <dirent.h>
 27 #include <limits.h>
 28 #include <fnmatch.h>
 29 
 30 #include "libblkid-tiny.h"
 31 
 32 #include <syslog.h>
 33 
 34 static char buf[PATH_MAX + 1];
 35 static char buf2[PATH_MAX];
 36 static unsigned int mode = 0600;
 37 
 38 static void make_dev(const char *path, bool block, int major, int minor)
 39 {
 40         unsigned int _mode = mode | (block ? S_IFBLK : S_IFCHR);
 41 
 42         mknod(path, _mode, makedev(major, minor));
 43 }
 44 
 45 static void find_devs(bool block)
 46 {
 47         char *path = block ? "/sys/dev/block" : "/sys/dev/char";
 48         struct dirent *dp;
 49         DIR *dir;
 50 
 51         dir = opendir(path);
 52         if (!dir)
 53                 return;
 54 
 55         path = buf2 + sprintf(buf2, "%s/", path);
 56         while ((dp = readdir(dir)) != NULL) {
 57                 char *c;
 58                 int major = 0, minor = 0;
 59                 int len;
 60 
 61                 if (dp->d_type != DT_LNK)
 62                         continue;
 63 
 64                 if (sscanf(dp->d_name, "%d:%d", &major, &minor) != 2)
 65                         continue;
 66 
 67                 strcpy(path, dp->d_name);
 68                 len = readlink(buf2, buf, sizeof(buf));
 69                 if (len <= 0 || len == sizeof(buf))
 70                         continue;
 71 
 72                 buf[len] = 0;
 73 
 74                 c = strrchr(buf, '/');
 75                 if (!c)
 76                         continue;
 77 
 78 
 79                 c++;
 80                 make_dev(c, block, major, minor);
 81         }
 82         closedir(dir);
 83 }
 84 
 85 int mkblkdev(void)
 86 {
 87         if (chdir("/dev"))
 88                 return 1;
 89 
 90         mode = 0600;
 91         find_devs(true);
 92 
 93         return chdir("/");
 94 }
 95
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Sources/fstools/libblkid-tiny/mkdev.c
