LXR linux/tools/testing/selftests/pid_namespace/regression

   1#define _GNU_SOURCE
   2#include <assert.h>
   3#include <errno.h>
   4#include <fcntl.h>
   5#include <linux/types.h>
   6#include <sched.h>
   7#include <signal.h>
   8#include <stdio.h>
   9#include <stdlib.h>
  10#include <string.h>
  11#include <syscall.h>
  12#include <sys/wait.h>
  13
  14#include "../kselftest_harness.h"
  15#include "../pidfd/pidfd.h"
  16
  17/*
  18 * Regression test for:
  19 * 35f71bc0a09a ("fork: report pid reservation failure properly")
  20 * b26ebfe12f34 ("pid: Fix error return value in some cases")
  21 */
  22TEST(regression_enomem)
  23{
  24        pid_t pid;
  25
  26        if (geteuid())
  27                EXPECT_EQ(0, unshare(CLONE_NEWUSER));
  28
  29        EXPECT_EQ(0, unshare(CLONE_NEWPID));
  30
  31        pid = fork();
  32        ASSERT_GE(pid, 0);
  33
  34        if (pid == 0)
  35                exit(EXIT_SUCCESS);
  36
  37        EXPECT_EQ(0, wait_for_pid(pid));
  38
  39        pid = fork();
  40        ASSERT_LT(pid, 0);
  41        ASSERT_EQ(errno, ENOMEM);
  42}
  43
  44TEST_HARNESS_MAIN
  45