tools/tests/darwintests/xnu_quick_test.c

   1 #define T_NAMESPACE xnu.quicktest
   2
   3 #include <darwintest.h>
   4
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <sys/stat.h>
   8 #include <sys/wait.h>
   9
  10 /*  **************************************************************************************************************
  11  *      Test fork wait4, and exit system calls.
  12  *  **************************************************************************************************************
  13  */
  14 T_DECL(fork_wait4_exit_test,
  15         "Tests forking off a process and waiting for the child to exit", T_META_CHECK_LEAKS(false))
  16 {
  17         int                             my_err, my_status;
  18     pid_t                       my_pid, my_wait_pid;
  19         struct rusage   my_usage;
  20         char *                  g_target_path="/";
  21
  22         /* spin off another process */
  23         T_ASSERT_NE(my_pid = fork(), -1, "Fork off a process");
  24
  25         if ( my_pid == 0 ) {
  26                 struct stat             my_sb;
  27
  28                 /* child process does very little then exits */
  29                 my_err = stat( &g_target_path[0], &my_sb );
  30                 T_WITH_ERRNO;
  31         T_ASSERT_TRUE(my_err == 0, "stat call with path: \"%s\" returned \"%d\"", &g_target_path[0], errno);
  32                 exit( 44 );
  33         }
  34
  35         /* parent process waits for child to exit */
  36         T_ASSERT_NE(my_wait_pid = wait4( my_pid, &my_status, 0, &my_usage ), -1,
  37                 "Wait for child to exit\n");
  38
  39         /* wait4 should return our child's pid when it exits */
  40         T_ASSERT_EQ(my_wait_pid, my_pid,
  41                 "wait4 should return our child's pid when it exits");
  42
  43         /* kind of just guessing on these values so if this fails we should take a closer
  44          * look at the returned rusage structure.
  45          */
  46          T_ASSERT_FALSE(( my_usage.ru_utime.tv_sec > 1 ||
  47                 my_usage.ru_stime.tv_sec > 1 || my_usage.ru_majflt > 1000 ||
  48                 my_usage.ru_msgsnd > 100 ), "wait4 returned rusage structure");
  49
  50         T_ASSERT_TRUE(( WIFEXITED( my_status ) && WEXITSTATUS( my_status ) == 44 ),
  51                 "check if wait4 returns right exit status");
  52 }