none/tests/execve.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 int main(int argc, char **argv)
   6 {
   7    if (argc == 1)
   8    {
   9       // This tests the case where argv and envp are NULL, which is easy to
  10       // get wrong because it's an unusual case. It is also bad and only
  11       // "worked" by accident with the linux kernel.
  12
  13       char *const argv_exe[] = {"true", NULL};
  14       char *const v_null[] = { NULL };
  15       char *const v_minus_one[] = { (char *const) -1, NULL };
  16
  17 #if defined(VGO_solaris)
  18       const char *exe = "/bin/true";
  19 #elif defined(VGO_darwin)
  20       const char *exe = "/usr/bin/true";
  21 #elif defined(VGO_freebsd)
  22       const char *exe = "/usr/bin/true";
  23 #else
  24       const char *exe = "/bin/true";
  25 #endif
  26
  27       /* Try some bad argv and envp arguments, make sure the executable
  28          doesn't actually exists, so execve doesn't accidentally succeeds.  */
  29       if (execve("/%/", NULL, NULL) >= 0)
  30         printf ("WHAT?");
  31       if (execve("/%/", (void *)-1, NULL) >= 0)
  32         printf ("WHAT?");
  33       if (execve("/%/", v_null, NULL) >= 0)
  34         printf ("WHAT?");
  35       if (execve("/%/", v_null, v_null) >= 0)
  36         printf ("WHAT?");
  37       if (execve("/%/", v_minus_one, NULL) >= 0)
  38         printf ("WHAT?");
  39       if (execve("/%/", v_minus_one, v_null) >= 0)
  40         printf ("WHAT?");
  41       if (execve("/%/", v_minus_one, v_minus_one) >= 0)
  42         printf ("WHAT?");
  43
  44       /* Finally a correct execve.  */
  45       if (execve(exe, argv_exe, NULL) < 0)
  46       {
  47          perror("execve");
  48          exit(1);
  49       }
  50    }
  51
  52    exit(0);
  53 }