oslib/linux-dev-lookup.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <sys/sysmacros.h>
   4 #include <dirent.h>
   5 #include <string.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8
   9 #include "linux-dev-lookup.h"
  10
  11 int blktrace_lookup_device(const char *redirect, char *path, unsigned int maj,
  12                            unsigned int min)
  13 {
  14         struct dirent *dir;
  15         struct stat st;
  16         int found = 0;
  17         DIR *D;
  18
  19         /*
  20          * If replay_redirect is set then always return this device
  21          * upon lookup which overrides the device lookup based on
  22          * major minor in the actual blktrace
  23          */
  24         if (redirect) {
  25                 strcpy(path, redirect);
  26                 return 1;
  27         }
  28
  29         D = opendir(path);
  30         if (!D)
  31                 return 0;
  32
  33         while ((dir = readdir(D)) != NULL) {
  34                 char full_path[257];
  35
  36                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
  37                         continue;
  38
  39                 sprintf(full_path, "%s/%s", path, dir->d_name);
  40                 if (lstat(full_path, &st) == -1) {
  41                         perror("lstat");
  42                         break;
  43                 }
  44
  45                 if (S_ISDIR(st.st_mode)) {
  46                         found = blktrace_lookup_device(redirect, full_path,
  47                                                                 maj, min);
  48                         if (found) {
  49                                 strcpy(path, full_path);
  50                                 break;
  51                         }
  52                 }
  53
  54                 if (!S_ISBLK(st.st_mode))
  55                         continue;
  56
  57                 if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) {
  58                         strcpy(path, full_path);
  59                         found = 1;
  60                         break;
  61                 }
  62         }
  63
  64         closedir(D);
  65         return found;
  66 }