阅读TCP某物，知道server并关闭sockfd当写两次，会产生SIGPIPE信号，假如不治疗，默认将挂起server
弄个小样本试验：
#include#include #include #include #include #include #include #include #include #include #include #include #include #define ERR_EXIT(m) \ do { \ perror(m);\ exit(EXIT_FAILURE);\ }while(0)void handle(int arg){ printf("sigpipe\n");}int main(int argc, const char *argv[]){ signal(SIGPIPE, handle);//SIGPIPE信号的处理 int sockfd = socket(AF_INET, SOCK_STREAM, 0); if(sockfd == -1) ERR_EXIT("socket"); struct sockaddr_in seraddr; seraddr.sin_family = AF_INET; seraddr.sin_port = htons(8888); seraddr.sin_addr.s_addr = inet_addr("127.0.0.1") ; socklen_t len = sizeof(seraddr); if(-1 == (bind(sockfd, (struct sockaddr*)&seraddr, len))) ERR_EXIT("bind"); if(listen(sockfd, 3) == -1) ERR_EXIT("listen"); int clientfd = accept(sockfd, NULL, NULL); printf("client\n"); while(1) { sleep(3); printf("hello\n"); write(clientfd, "hello", sizeof("hello")); } return 0;}
client使用telnet连接
发现：
当client关闭后，server端还会写两次后。就会收到SIGPIPE信号，兴许继续会收到此信号
telnet localhost 8888
--》client：
syswj@host ~]$ telnet localhost 8888Trying ::1...telnet: connect to address ::1: Connection refusedTrying 127.0.0.1...Connected to localhost.Escape character is '^]'.hellohellohello^]telnet> Connection closed.
server信息：
➜ mianshi git:(master) ✗ ./a.out clienthellohellohellohello //-》对方会发送一个RST复位报文hellosigpipe hellosigpipe //-->是因为write导致的hellosigpipehellosigpipe^C
能够看到是在client关闭后，再发送 第2个信息后才收到的SIFPIPE信号
兴许发送仍然会收到SIGPIPE信号
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