dispatch-1.0/testing/dispatch_read.c

   1 /*
   2  * Copyright (c) 2008-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <assert.h>
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <errno.h>
  29
  30 #include <dispatch/dispatch.h>
  31
  32 #include <bsdtests.h>
  33 #include "dispatch_test.h"
  34
  35 static size_t bytes_total;
  36 static size_t bytes_read;
  37
  38 void
  39 test_fin(void *cxt)
  40 {
  41         test_ptr("test_fin run", cxt, cxt);
  42         test_stop();
  43 }
  44
  45 int
  46 main(void)
  47 {
  48         const char *path = "/usr/share/dict/words";
  49         struct stat sb;
  50
  51         dispatch_test_start("Dispatch Source Read");
  52
  53         int infd = open(path, O_RDONLY);
  54         if (infd == -1) {
  55                 perror(path);
  56                 exit(EXIT_FAILURE);
  57         }
  58         if (fstat(infd, &sb) == -1) {
  59                 perror(path);
  60                 exit(EXIT_FAILURE);
  61         }
  62         bytes_total = sb.st_size;
  63
  64         if (fcntl(infd, F_SETFL, O_NONBLOCK) != 0) {
  65                 perror(path);
  66                 exit(EXIT_FAILURE);
  67         }
  68
  69         if (!dispatch_test_check_evfilt_read_for_fd(infd)) {
  70                 test_skip("EVFILT_READ kevent not firing for test file");
  71                 test_fin(NULL);
  72         }
  73
  74         dispatch_queue_t main_q = dispatch_get_main_queue();
  75         test_ptr_notnull("dispatch_get_main_queue", main_q);
  76
  77         dispatch_source_t reader = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, infd, 0, main_q);
  78         test_ptr_notnull("dispatch_source_create", reader);
  79         assert(reader);
  80
  81         dispatch_source_set_event_handler(reader, ^{
  82                 size_t estimated = dispatch_source_get_data(reader);
  83                 fprintf(stderr, "bytes available: %zu\n", estimated);
  84                 test_double_less_than_or_equal("estimated", estimated, bytes_total - bytes_read);
  85                 const ssize_t bufsiz = 1024*500; // 500 KB buffer
  86                 static char buffer[1024*500];   // 500 KB buffer
  87                 ssize_t actual = read(infd, buffer, sizeof(buffer));
  88                 bytes_read += actual;
  89                 printf("bytes read: %zd\n", actual);
  90                 if (actual < bufsiz) {
  91                         actual = read(infd, buffer, sizeof(buffer));
  92                         bytes_read += actual;
  93                         // confirm EOF condition
  94                         test_long("EOF", actual, 0);
  95                         dispatch_source_cancel(reader);
  96                 }
  97         });
  98
  99         dispatch_source_set_cancel_handler(reader, ^{
 100                 test_long("Bytes read", bytes_read, bytes_total);
 101                 int res = close(infd);
 102                 test_errno("close", res == -1 ? errno : 0, 0);
 103                 dispatch_release(reader);
 104         });
 105
 106         dispatch_set_context(reader, reader);
 107         dispatch_set_finalizer_f(reader, test_fin);
 108
 109         dispatch_resume(reader);
 110
 111         dispatch_main();
 112 }