#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 = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, infd, 0, main_q);
test_ptr_notnull("dispatch_source_create", reader);
assert(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; static char buffer[1024*500]; 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;
test_long("EOF", actual, 0);
dispatch_source_cancel(reader);
}
});
dispatch_source_set_cancel_handler(reader, ^{
test_long("Bytes read", bytes_read, bytes_total);
test_stop();
});
dispatch_resume(reader);
dispatch_main();
}