tests/pipe_kevent.c

   1 /*
   2  * Copyright (c) 2019 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <darwintest.h>
  30 #include <darwintest_multiprocess.h>
  31 #include <stdio.h>
  32 #include <unistd.h>
  33 #include <sys/wait.h>
  34 #include <pthread.h>
  35 #include <stdlib.h>
  36 #include <signal.h>
  37 #include <dispatch/dispatch.h>
  38 #include <fcntl.h>
  39 #include <string.h>
  40 #include <errno.h>
  41
  42 T_DECL(pipe_noblock_kevent,
  43     "Set a pipe and no block and setup EVFLT_WRITE kevent on it and make sure it does not fire when the pipe is full")
  44 {
  45         int fd[2], write_fd;
  46         dispatch_queue_t dq1 = dispatch_queue_create("com.apple.test.pipe_noblock_kevent.queue", DISPATCH_QUEUE_SERIAL);
  47
  48         pipe(fd);
  49         write_fd = fd[1];
  50         __block int iter = 1;
  51
  52         /* Make sure the pipe is No block */
  53         fcntl(write_fd, F_SETFL, (O_NONBLOCK));
  54
  55         dispatch_source_t write_source = dispatch_source_create(DISPATCH_SOURCE_TYPE_WRITE, (uintptr_t)write_fd, 0, dq1);
  56         dispatch_source_set_event_handler(write_source, ^{
  57                 unsigned long length = dispatch_source_get_data(write_source);
  58
  59                 T_LOG("Iteration: %d, Length available: %lu\n", iter++, length);
  60
  61                 char buf[512] = "deadbeef";
  62                 ssize_t rv = write(write_fd, buf, 512);
  63                 T_EXPECT_POSIX_SUCCESS(rv, "write success");
  64                 if (rv < 0) {
  65                         T_FAIL("Write should have succeeded but failed with error %ld", rv);
  66                         T_END;
  67                 }
  68         });
  69
  70         dispatch_resume(write_source);
  71
  72         T_LOG("Arming a timer for 15 seconds to exit, assuming kevent will block before that");
  73         dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 15 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
  74                 T_LOG("PASS: Kevent blocked as expected in the EVFLT_WRITE");
  75                 T_END;
  76         });
  77
  78         dispatch_main();
  79 }