test/test78.c

   1 /* Test for getdents().
   2  * Just tests whatever FS the test is executed from.
   3  *
   4  * This test creates lots of nodes of various types, verifies that readdir()
   5  * (and so getdents()) returns all of them exactly once, and nothing else
   6  * (except for "." and ".."), and verifies the struct dirents are correct.
   7  */
   8
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <dirent.h>
  16 #include <fcntl.h>
  17 #include <unistd.h>
  18
  19 #include "common.h"
  20
  21 #define FILETYPES       6
  22
  23 #define LOOPS   30
  24
  25 struct filetype {
  26         char *fnbase;   /* type-unique base name */
  27         int dt;         /* dirent type that getdents() should return */
  28         mode_t modebit; /* mode bit unique to this type */
  29 } filetypes[FILETYPES] = {
  30         { "fifo",       DT_FIFO, S_IFIFO },
  31         { "chr",        DT_CHR,  S_IFCHR },
  32         { "dir",        DT_DIR,  S_IFDIR },
  33         { "blk",        DT_BLK,  S_IFBLK },
  34         { "reg",        DT_REG,  S_IFREG },
  35         { "lnk",        DT_LNK,  S_IFLNK },
  36 };
  37
  38 int seen[FILETYPES][LOOPS];
  39
  40 /* create a node named 'f' using code 'call'. check it doesn't exist
  41  * before hand, and does exist afterwards, and has the expected modebit.
  42  */
  43
  44 #define CR(f, call, modebit) do {                       \
  45         struct stat sb;                                 \
  46         if(lstat(f, &sb) >= 0) { e(1); }                \
  47         if((call) < 0) { e(2); }                        \
  48         if(lstat(f, &sb) < 0) { e(3); }                 \
  49         if(!(sb.st_mode & (modebit))) { e(4); }         \
  50 } while(0)
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55         int i, t;
  56         DIR *dir;
  57         struct dirent *de;
  58
  59         start(78);
  60
  61         /* create contents */
  62
  63         for(i = 0; i < LOOPS; i++) {
  64                 for(t = 0; t < FILETYPES; t++) {
  65                         int c;
  66                         char fn[2000];
  67                         mode_t m = filetypes[t].modebit;
  68
  69                         /* think of a filename; do varying lengths to check
  70                          * dirent record length alignment issues
  71                          */
  72
  73                         snprintf(fn, sizeof(fn), "%d.%d.%d.", t, filetypes[t].dt, i);
  74                         for(c = 0; c < i; c++) strcat(fn, "x");
  75
  76                         /* create the right type */
  77
  78                         switch(filetypes[t].dt) {
  79                           case DT_FIFO: CR(fn, mknod(fn, 0600|S_IFIFO, 0), m); break;
  80                           case DT_CHR:  CR(fn, mknod(fn, 0600|S_IFCHR, 0), m); break;
  81                           case DT_BLK:  CR(fn, mknod(fn, 0600|S_IFBLK, 0), m); break;
  82                           case DT_REG:  CR(fn, mknod(fn, 0600|S_IFREG, 0), m); break;
  83                           case DT_DIR:  CR(fn, mkdir(fn, 0600), m); break;
  84                           case DT_LNK:  CR(fn, symlink("dest", fn), m); break;
  85                           default: e(10); break;
  86                         }
  87                 }
  88         }
  89
  90         /* Verify that readdir() returns dirent structs with reasonable contents */
  91
  92         if(!(dir = opendir("."))) { e(20); return 1; }
  93
  94         while((de = readdir(dir))) {
  95                 int dt;
  96                 struct stat sb;
  97
  98                 if(!strcmp(de->d_name, ".")) continue;
  99                 if(!strcmp(de->d_name, "..")) continue;
 100
 101                 if(sscanf(de->d_name, "%d.%d.%d", &t, &dt, &i) != 3) {
 102                         e(30);
 103                         continue;
 104                 }
 105
 106                 /* sanity check on filename numbers */
 107
 108                 if(t < 0 || dt < 0 || i < 0) { e(31); continue; }
 109                 if(t >= FILETYPES || i >= LOOPS) { e(32); continue; }
 110                 if(seen[t][i]) { e(33); continue; }
 111                 seen[t][i] = 1;
 112                 if(filetypes[t].dt != dt) { e(34); continue; }
 113                 if(lstat(de->d_name, &sb) < 0) { e(35); continue; }
 114                 if(!(sb.st_mode & filetypes[t].modebit)) { e(36); continue; }
 115
 116                 /* Now we know this file is ours and has the expected type;
 117                  * now we can verify the contents of the dirent struct. d_name
 118                  * is OK because sscanf and stat worked on it.
 119                  */
 120
 121                 if(de->d_type != dt) { e(37); }
 122                 if(de->d_fileno != sb.st_ino) { e(38); }
 123                 if(de->d_namlen != strlen(de->d_name)) { e(39); }
 124                 if(de->d_reclen != _DIRENT_RECLEN(de, de->d_namlen)) { e(40); }
 125         }
 126
 127         if(closedir(dir) < 0) e(50);
 128
 129         /* Verify that we have seen all files we expected to see. */
 130
 131         for(i = 0; i < LOOPS; i++) {
 132                 for(t = 0; t < FILETYPES; t++) {
 133                         if(!seen[t][i]) { e(60); break; }
 134                 }
 135         }
 136
 137         quit();
 138 }