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/*
* Copyright (c) 2008-2009 Apple Inc. All rights reserved.
*
* @APPLE_APACHE_LICENSE_HEADER_START@
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @APPLE_APACHE_LICENSE_HEADER_END@
*/
#include "config/config.h"
#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <dispatch/dispatch.h>
#include "dispatch_test.h"
static size_t bytes_total;
static size_t bytes_read;
int main(void)
{
const char *path = "/usr/share/dict/words";
struct stat sb;
test_start("Dispatch Source Read");
int infd = open(path, O_RDONLY);
if (infd == -1) {
perror(path);
exit(EXIT_FAILURE);
}
if (fstat(infd, &sb) == -1) {
perror(path);
exit(EXIT_FAILURE);
}
bytes_total = sb.st_size;
if (fcntl(infd, F_SETFL, O_NONBLOCK) != 0) {
perror(path);
exit(EXIT_FAILURE);
}
dispatch_queue_t main_q = dispatch_get_main_queue();
test_ptr_notnull("dispatch_get_main_queue", main_q);
dispatch_source_t reader;
reader = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, infd, 0, main_q);
test_ptr_notnull("DISPATCH_SOURCE_TYPE_READ", reader);
dispatch_source_set_event_handler(reader, ^{
size_t estimated = dispatch_source_get_data(reader);
printf("bytes available: %zu\n", estimated);
const ssize_t bufsiz = 1024*500; // 500 KB buffer
static char buffer[1024*500]; // 500 KB buffer
ssize_t actual = read(infd, buffer, sizeof(buffer));
bytes_read += actual;
printf("bytes read: %zd\n", actual);
if (actual < bufsiz) {
actual = read(infd, buffer, sizeof(buffer));
bytes_read += actual;
// confirm EOF condition
test_long("EOF", actual, 0);
dispatch_source_cancel(reader);
dispatch_release(reader);
}
});
dispatch_source_set_cancel_handler(reader, ^{
test_long("Bytes read", bytes_read, bytes_total);
int res = close(infd);
test_errno("close", res == -1 ? errno : 0, 0);
test_stop();
});
dispatch_resume(reader);
dispatch_main();
}
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