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145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/* Basic tests for Linux process_madvise.
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Copyright (C) 2022-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/process_state.h>
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#include <support/support.h>
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#include <support/xsocket.h>
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#include <support/xunistd.h>
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#include <sys/mman.h>
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#include <sys/pidfd.h>
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#include <sys/wait.h>
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/* The pair of sockets used for coordination. The subprocess uses
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sockets[1]. */
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static int sockets[2];
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static long int page_size;
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static void
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exit_subprocess (int dummy)
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{
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exit (EXIT_FAILURE);
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}
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static void
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subprocess (void)
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{
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/* In case something goes wrong with parent before pidfd_send_signal. */
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support_create_timer (5, 0, false, exit_subprocess);
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void *p1 = xmmap (NULL, page_size * 2, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1);
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void *p2 = xmmap (NULL, page_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1);
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xmunmap(p2, page_size);
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xsendto (sockets[1], &(struct iovec) { p1, page_size * 2 },
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sizeof (struct iovec), 0, NULL, 0);
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xsendto (sockets[1], &(struct iovec) { p2, page_size },
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sizeof (struct iovec), 0, NULL, 0);
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pause ();
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_exit (0);
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}
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static int
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do_test (void)
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{
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page_size = sysconf (_SC_PAGE_SIZE);
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{
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int r = pidfd_open (-1, 0);
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TEST_COMPARE (r, -1);
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if (errno == ENOSYS)
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FAIL_UNSUPPORTED ("kernel does not support pidfd_open, skipping test");
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TEST_COMPARE (errno, EINVAL);
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}
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TEST_COMPARE (socketpair (AF_UNIX, SOCK_STREAM, 0, sockets), 0);
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pid_t pid = xfork ();
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if (pid == 0)
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{
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xclose (sockets[0]);
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subprocess ();
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}
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xclose (sockets[1]);
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int pidfd = pidfd_open (pid, 0);
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TEST_VERIFY (pidfd != -1);
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/* The target process is going to send us two iovec's. The first one points
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to a valid mapping, the other points to a previously valid mapping which
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has now been unmapped. */
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{
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struct iovec iv;
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xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
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/* We expect this to succeed in the target process because the mapping
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is valid. */
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ssize_t ret = process_madvise (pidfd, &iv, 1, MADV_COLD, 0);
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if (ret == -1 && errno == ENOSYS)
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FAIL_UNSUPPORTED ("kernel does not support process_madvise, skipping"
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"test");
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TEST_COMPARE (ret, 2 * page_size);
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}
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{
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struct iovec iv;
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xrecvfrom (sockets[0], &iv, sizeof (iv), 0, NULL, 0);
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/* We expect this to fail in the target process because the second iovec
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points to an unmapped region. The target process arranges for this to
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be the case. */
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TEST_COMPARE (process_madvise (pidfd, &iv, 1, MADV_COLD, 0), -1);
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TEST_COMPARE (errno, ENOMEM);
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}
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{
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struct iovec iv[IOV_MAX + 1];
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TEST_COMPARE (process_madvise (pidfd, iv, array_length (iv), MADV_COLD,
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0), -1);
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TEST_COMPARE (errno, EINVAL);
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}
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TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), 0);
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{
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siginfo_t info;
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int r = waitid (P_PIDFD, pidfd, &info, WEXITED);
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TEST_COMPARE (r, 0);
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TEST_COMPARE (info.si_status, SIGKILL);
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TEST_COMPARE (info.si_code, CLD_KILLED);
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}
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TEST_COMPARE (pidfd_send_signal (pidfd, SIGKILL, NULL, 0), -1);
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TEST_COMPARE (errno, ESRCH);
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return 0;
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}
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#include <support/test-driver.c>
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