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2918b0d0ec
This patch adds early cancel test for open syscall through a FIFO (thus makign subsequent call to open block until the other end is also opened). It also cleanup the sigpause tests by using sigpause along with SIGINT instead of __xpg_sigpause and SIGCANCEL. Since the idea is just to test the cancellation handling there is no need to expose internal glibc implementation details to the test through pthreadP.h inclusion. Tested x86_64. * nptl/tst-cancel4-common.c (do_test): Add temporary fifo creation. * nptl/tst-cancel4-common.h (fifoname): New variable. (fifofd): Likewise. (cl_fifo): New function. * nptl/tst-cancel4.c (tf_sigpause): Replace SIGCANCEL usage by SIGINT. (tf_open): Add early cancel test.
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Common definition for tst-cancel4_* tests.
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Copyright (C) 2016 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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<http://www.gnu.org/licenses/>. */
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#include <pthread.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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/* 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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