1 #include"apue.h"
2 typedef void Sigfunc(int);
3 //void (*signal(int signo,void (*func)(int)))(int);
4 static void connect_alarm(int);
5 int connect_timeout(int sockfd,(SA*)pserveraddr,socklen_t len,int sec)
6 {
7 signal(SIGALRM,connect_alarm);
8 int res;
9 Sigfunc * sigfunc=alarm(sec); //sigfunc restore old sig function
10 if((res=connect(sockfd,pserveraddr,len))<0)
11 {
12 if(errno==EINTR)
13 {
14 fprintf(stderr,"time out!\n");
15 errno=ETIMEOUT;
16 close(fd);
17 return n; //-1 connection error;
18 }
19 }
20 else
21 {
22 alarm(0);
23 signal(SIGALRM,sigfunc); //restore old sigfunction
24 return n; // 0 connection success!
25 }
26
27 }
static void connect_alarm(int)
{
return ;
}
