oslib/linux-dev-lookup.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <dirent.h>
   4 #include <string.h>
   5 #include <stdio.h>
   6 #include <unistd.h>
   7
   8 #include "../os/os.h"
   9 #include "oslib/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         D = opendir(path);
  20         if (!D)
  21                 return 0;
  22
  23         while ((dir = readdir(D)) != NULL) {
  24                 char full_path[256];
  25
  26                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
  27                         continue;
  28
  29                 sprintf(full_path, "%s/%s", path, dir->d_name);
  30                 if (lstat(full_path, &st) == -1) {
  31                         perror("lstat");
  32                         break;
  33                 }
  34
  35                 if (S_ISDIR(st.st_mode)) {
  36                         found = blktrace_lookup_device(redirect, full_path,
  37                                                                 maj, min);
  38                         if (found) {
  39                                 strcpy(path, full_path);
  40                                 break;
  41                         }
  42                 }
  43
  44                 if (!S_ISBLK(st.st_mode))
  45                         continue;
  46
  47                 /*
  48                  * If replay_redirect is set then always return this device
  49                  * upon lookup which overrides the device lookup based on
  50                  * major minor in the actual blktrace
  51                  */
  52                 if (redirect) {
  53                         strcpy(path, redirect);
  54                         found = 1;
  55                         break;
  56                 }
  57
  58                 if (maj == major(st.st_rdev) && min == minor(st.st_rdev)) {
  59                         strcpy(path, full_path);
  60                         found = 1;
  61                         break;
  62                 }
  63         }
  64
  65         closedir(D);
  66         return found;
  67 }