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113 lines
3.3 KiB
C
113 lines
3.3 KiB
C
/* Common definition for tst-cancel4_* tests.
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Copyright (C) 2016-2023 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 <pthread.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <support/xunistd.h>
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/* Pipe descriptors. */
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static int fds[2];
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/* Temporary file descriptor, to be closed after each round. */
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static int tempfd = -1;
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static int tempfd2 = -1;
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/* Name of temporary file to be removed after each round. */
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static char *tempfname;
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/* Temporary message queue. */
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static int tempmsg = -1;
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/* Often used barrier for two threads. */
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static pthread_barrier_t b2;
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/* The WRITE_BUFFER_SIZE value needs to be chosen such that if we set
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the socket send buffer size to '1', a write of this size on that
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socket will block.
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The Linux kernel imposes a minimum send socket buffer size which
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has changed over the years. As of Linux 3.10 the value is:
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2 * (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
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which is attempting to make sure that with standard MTUs,
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TCP can always queue up at least 2 full sized packets.
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Furthermore, there is logic in the socket send paths that
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will allow one more packet (of any size) to be queued up as
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long as some socket buffer space remains. Blocking only
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occurs when we try to queue up a new packet and the send
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buffer space has already been fully consumed.
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Therefore we must set this value to the largest possible value of
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the formula above (and since it depends upon the size of "struct
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sk_buff", it is dependent upon machine word size etc.) plus some
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slack space. */
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#define WRITE_BUFFER_SIZE 16384
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/* Set the send buffer of socket S to 1 byte so any send operation
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done with WRITE_BUFFER_SIZE bytes will force syscall blocking. */
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static void
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set_socket_buffer (int s)
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{
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int val = 1;
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socklen_t len = sizeof (val);
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TEST_VERIFY_EXIT (setsockopt (s, SOL_SOCKET, SO_SNDBUF, &val,
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sizeof (val)) == 0);
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TEST_VERIFY_EXIT (getsockopt (s, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0);
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TEST_VERIFY_EXIT (val < WRITE_BUFFER_SIZE);
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printf("got size %d\n", val);
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}
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/* Cleanup handling test. */
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static int cl_called;
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static void
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cl (void *arg)
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{
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++cl_called;
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}
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/* Named pipe used to check for blocking open. It should be closed
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after the cancellation handling. */
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static char fifoname[] = "/tmp/tst-cancel4-fifo-XXXXXX";
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static int fifofd;
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static void
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__attribute__ ((used))
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cl_fifo (void *arg)
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{
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++cl_called;
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unlink (fifoname);
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close (fifofd);
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fifofd = -1;
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}
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struct cancel_tests
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{
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const char *name;
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void *(*tf) (void *);
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int nb;
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int only_early;
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};
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#define ADD_TEST(name, nbar, early) { #name, tf_##name, nbar, early }
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