tests/pipe_read_infloop_55437634.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include <sys/types.h>
   5 #include <sys/uio.h>
   6 #include <unistd.h>
   7
   8 #include <darwintest.h>
   9
  10 static void
  11 too_long(int ignored)
  12 {
  13         T_ASSERT_FAIL("child readv is blocked");
  14 }
  15
  16 T_DECL(pipe_read_infloop_55437634, "Infinite loop in pipe_read")
  17 {
  18         int p[2];
  19         char c = 0;
  20         struct iovec iov = {
  21                 .iov_base = &c,
  22                 .iov_len = 0x100000000UL
  23         };
  24         pid_t child;
  25         int status = 0;
  26
  27         T_SETUPBEGIN;
  28         /* create a pipe with some data in it: */
  29         T_ASSERT_POSIX_SUCCESS(pipe(p), NULL);
  30         T_ASSERT_POSIX_SUCCESS(write(p[1], "A", 1), NULL);
  31         T_SETUPEND;
  32
  33         T_ASSERT_POSIX_SUCCESS(child = fork(), NULL);
  34
  35         if (!child) {
  36                 readv(p[0], &iov, 1);
  37                 exit(0);
  38         }
  39
  40         /*
  41          * if the waitpid takes too long, the child is probably stuck in the
  42          * infinite loop, so fail via too_long.
  43          */
  44         T_ASSERT_NE(signal(SIGALRM, too_long), SIG_ERR, NULL);
  45         T_ASSERT_POSIX_SUCCESS(alarm(10), NULL);
  46
  47         /* this will hang if the bug is there: */
  48         T_ASSERT_POSIX_SUCCESS(waitpid(child, &status, 0), NULL);
  49
  50         /* expecting a clean, zero exit: */
  51         T_ASSERT_TRUE(WIFEXITED(status), NULL);
  52         T_ASSERT_EQ(WEXITSTATUS(status), 0, NULL);
  53 }