sysdeps/unix/sysv/linux/tst-process_mrelease.c

   1 /* Basic tests for Linux process_mrelease.
   2    Copyright (C) 2022-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <support/check.h>
  22 #include <support/support.h>
  23 #include <support/xsocket.h>
  24 #include <support/xunistd.h>
  25 #include <sys/mman.h>
  26 #include <sys/pidfd.h>
  27 #include <sys/wait.h>
  28
  29 static void
  30 exit_subprocess (int dummy)
  31 {
  32   exit (EXIT_FAILURE);
  33 }
  34
  35 static void
  36 subprocess (void)
  37 {
  38   /* In case something goes wrong with parent before pidfd_send_signal.  */
  39   support_create_timer (5, 0, false, exit_subprocess);
  40
  41   pause ();
  42   _exit (0);
  43 }
  44
  45 static int
  46 do_test (void)
  47 {
  48   {
  49     int r = process_mrelease (-1, 0);
  50     TEST_COMPARE (r, -1);
  51     if (errno == ENOSYS)
  52       FAIL_UNSUPPORTED ("kernel does not support process_mrelease, "
  53                         "skipping test");
  54     TEST_COMPARE (errno, EBADF);
  55   }
  56
  57   pid_t pid = xfork ();
  58   if (pid == 0)
  59     subprocess ();
  60
  61   int pidfd = pidfd_open (pid, 0);
  62   TEST_VERIFY (pidfd != -1);
  63
  64   /* The syscall only succeeds if the target process is exiting and there
  65      is no guarantee that calling if after pidfd_send_signal will not error
  66      (ince the process might have already been reaped by the OS).  So just
  67      check if it does fail when the process is stll running.  */
  68   TEST_COMPARE (process_mrelease (pidfd, 0), -1);
  69   TEST_COMPARE (errno, EINVAL);
  70
  71   TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
  72   {
  73     siginfo_t info;
  74     int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
  75     TEST_COMPARE (r, 0);
  76     TEST_COMPARE (info.si_status, SIGKILL);
  77     TEST_COMPARE (info.si_code, CLD_KILLED);
  78   }
  79
  80   TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), -1);
  81   TEST_COMPARE (errno, ESRCH);
  82
  83   return 0;
  84 }
  85
  86 #include <support/test-driver.c>