asynctest.c
上传用户:wudi5211
上传日期:2010-01-21
资源大小:607k
文件大小:1k
- /*
- * asynctest.c: use async notification to read stdin
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <signal.h>
- #include <fcntl.h>
- int gotdata=0;
- void sighandler(int signo)
- {
- if (signo==SIGIO)
- gotdata++;
- return;
- }
- char buffer[4096];
- int main(int argc, char **argv)
- {
- int count;
- struct sigaction action;
- memset(&action, 0, sizeof(action));
- action.sa_handler = sighandler;
- action.sa_flags = 0;
- sigaction(SIGIO, &action, NULL);
- fcntl(STDIN_FILENO, F_SETOWN, getpid());
- fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL) | FASYNC);
- while(1) {
- /* this only returns if a signal arrives */
- sleep(86400); /* one day */
- if (!gotdata)
- continue;
- count=read(0, buffer, 4096);
- /* buggy: if avail data is more than 4kbytes... */
- write(1,buffer,count);
- gotdata=0;
- }
- }