minix/tests/test61.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include <sys/wait.h>
   4 #include <sys/syslimits.h>
   5 #include <fcntl.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8
   9 int max_error = 5;
  10 #include "common.h"
  11
  12
  13 void dangling_slink(int sub_test, char const slink_to[PATH_MAX]);
  14
  15 void dangling_slink(int sub_test, char const slink_to[PATH_MAX])
  16 {
  17   pid_t child;
  18
  19   subtest = sub_test;
  20
  21   child = fork();
  22   if (child == (pid_t) -1) {
  23         e(1);
  24         return;
  25   } else if (child == (pid_t) 0) {
  26         /* I'm the child. Create a dangling symlink with an absolute path */
  27         int fd;
  28         char buf[4];
  29
  30
  31         /* We don't want to actually write to '/', so instead we pretend */
  32         if (chroot(".") != 0) e(2);
  33
  34         /* Create file 'slink_to' with contents "bar" */
  35         if ((fd = open(slink_to, O_CREAT|O_WRONLY)) == -1) e(3);
  36         if (write(fd, "bar", strlen("bar")) != strlen("bar")) e(4);
  37         close(fd);
  38
  39         if (symlink(slink_to, "a") == -1) e(5); /* Create the symlink */
  40         if (rename(slink_to, "c") == -1) e(6); /* Make it a dangling symlink */
  41
  42         /* Write "foo" to symlink; this should recreate file 'slink_to' with
  43          * contents "foo" */
  44         if ((fd = open("a", O_CREAT|O_WRONLY)) == -1) e(7);
  45         if (write(fd, "foo", strlen("foo")) != strlen("foo")) e(8);
  46         close(fd);
  47
  48         /* Verify 'a' and 'slink_to' contain "foo" */
  49         memset(buf, '\0', sizeof(buf));
  50         if ((fd = open("a", O_RDONLY)) == -1) e(9);
  51         if (read(fd, buf, 3) != 3) e(10);
  52         if (strncmp(buf, "foo", strlen("foo"))) e(11);
  53         close(fd);
  54         memset(buf, '\0', sizeof(buf));
  55         if ((fd = open(slink_to, O_RDONLY)) == -1) e(12);
  56         if (read(fd, buf, 3) != 3) e(13);
  57         if (strncmp(buf, "foo", strlen("foo"))) e(14);
  58         close(fd);
  59
  60         /* Verify 'c' contains 'bar' */
  61         memset(buf, '\0', sizeof(buf));
  62         if ((fd = open("c", O_RDONLY)) == -1) e(15);
  63         if (read(fd, buf, 3) != 3) e(16);
  64         if (strncmp(buf, "bar", strlen("bar"))) e(17);
  65         close(fd);
  66
  67         /* Cleanup created files */
  68         if (unlink(slink_to) == -1) e(18);
  69         if (unlink("c") == -1) e(19);
  70
  71         /* Use the dangling symlink to test mknod(2) following symlinks */
  72         if (mknod("a", S_IFCHR | 0777, makedev(1, 1)) != -1) e(20);
  73         if (errno != EEXIST) e(21);
  74         if (unlink("a") == -1) e(22);
  75
  76         exit(EXIT_SUCCESS);
  77   } else {
  78         int status;
  79         if (wait(&status) == -1) e(7);
  80   }
  81
  82
  83 }
  84
  85 int main(int argc, char *argv[])
  86 {
  87   start(61);
  88   dangling_slink(1, "/abs"); /* Create dangling symlink with absolute path */
  89   dangling_slink(2, "rel"); /* Create dangling symlink with relative path */
  90   quit();
  91   return(-1);   /* Unreachable */
  92 }
  93