socket例子及高階用法

使用sigalrm訊號為阻塞操作設定超時

可以處理connect和read等超時

#include#include#include#include#include#include#include#include #include #include #define maxline 4096

typedef void (*sighandler_t)(int);
#define timeout_set
static void connect_alarm(int sig_num)
static void now_alarm(int sig_num)
int main(int argc, char** argv)
; sighandler_t p;
unsigned int remain_sec;
struct sigaction sa_alarm;
if( argc != 2) else 
if( (sockfd = socket(af_inet, sock_stream, 0)) < 0)
memset(&servaddr, 0, sizeof(servaddr));
//結構體清零
servaddr.sin_family = af_inet;
servaddr.sin_port = htons(6666);//埠號
if( inet_pton(af_inet, server_ip, &servaddr.sin_addr) <= 0)
printf("connect to server here~~~maybe wait here\n");
#ifdef timeout_set
#if 0
p = signal(sigalrm, connect_alarm);
if(p == sig_err) 
printf("p:%p connect_alarm:%p\n", p, connect_alarm);
#else
sa_alarm.sa_flags = sa_resethand;
sa_alarm.sa_handler = connect_alarm;
sigaction(sigalrm, &sa_alarm, null);
#endif
remain_sec = alarm(5);
printf("remain sec:%d\n", remain_sec);
if(remain_sec != 0) 
//while(1);
#if 0
//set to null
p = signal(sigalrm, p);
if(p == sig_err) 
printf("p:%p connect_alarm:%p\n", p, connect_alarm); 
#endif
#endif
if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
printf("send msg to server: \n");
fgets(sendline, 4096, stdin);
if( send(sockfd, sendline, strlen(sendline), 0) < 0) 
close(sockfd);
exit(0);
}

server.c

#include#include#include#include#include#include#include#define maxline 4096

int main(int argc, char** argv)
memset(&servaddr, 0, sizeof(servaddr));
//協議位址
servaddr.sin_family = af_inet;
servaddr.sin_addr.s_addr = htonl(inaddr_any);
servaddr.sin_port = htons(6666);//
//bind把乙個位址族中的特定位址賦給socket
if( bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1)
if( listen(listenfd, 10) == -1)
printf("*****=waiting for client's request*****=\n");
while(1)
n = recv(connfd, buff, maxline, 0);
buff[n] = '\0';
printf("recv msg from client: %s\n", buff);
close(connfd);
} close(listenfd);
}

#include#include#include#include#include#include#include#define maxline 4096

int main(int argc, char** argv)
if( (sockfd = socket(af_inet, sock_stream, 0)) < 0)
memset(&servaddr, 0, sizeof(servaddr));
//結構體清零
servaddr.sin_family = af_inet;
servaddr.sin_port = htons(6666);//埠號
if( inet_pton(af_inet, argv[1], &servaddr.sin_addr) <= 0)
if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
printf("send msg to server: \n");
fgets(sendline, 4096, stdin);
if( send(sockfd, sendline, strlen(sendline), 0) < 0) 
close(sockfd);
exit(0);
}

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