标签:class blog code color com 文件
一个简单点的阻塞式tcp服务器如下所示:
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#include <stdio.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> int main( int
argc, char **argv) { int
listenfd,connfd,n, ret; struct
sockaddr_in servaddr, cliaddr; socklen_t clilen; pid_t childpid; char
mesg[1000], *peeraddr; listenfd = socket(AF_INET, SOCK_STREAM, 0); if
(listenfd < 0) { printf ( "create socket error\n" ); return
-1; } printf ( "create socket success\n" ); memset (&servaddr, 0, sizeof (servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(6789); ret = bind(listenfd, ( struct
sockaddr *)&servaddr, sizeof (servaddr)); if
(ret == -1) { printf ( "bind error\n" ); return
-1; } printf ( "bind success\n" ); ret = listen(listenfd, 1024); if
(ret == -1) { printf ( "listen error\n" ); return
-1; } printf ( "listening...\n" ); for
(;;) { clilen = sizeof (cliaddr); connfd = accept(listenfd, ( struct
sockaddr *)&cliaddr, &clilen); printf ( "Accept request from %s\n" , inet_ntoa(cliaddr.sin_addr)); n = read(connfd, mesg, 1000); if
(n < 0) { printf ( "read error!\n" ); } printf ( "Received:%s\n" , mesg); close(connfd); } } |
编译期间没有遇到问题。运行的时候程序在47行收到了segment fault错误。用man手册查看inet_ntoa,调用方式如下:
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char
*inet_ntoa( struct
in_addr in); |
cliaddr的类型定义是:
struct sockaddr_in { /* in netinet/in.h */
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<em id= "__mceDel" > sa_family_t sin_family; in_port_t sin_port; struct
in_addr sin_addr; unsigned char
sin_zero[ sizeof ( struct
sockaddr) - sizeof (sa_family_t) - sizeof (in_port_t), sizeof ( struct
in_addr)]; }; </em> |
乍一看,没什么问题啊,怎么会出现段错误呢?
捣腾了半天,才发现是缺少了inet_ntoa所在的头文件 arpa/inet.h,包含该头文件即可。好坑。
inet_ntoa 的一个小问题,布布扣,bubuko.com
标签:class blog code color com 文件
原文地址:http://www.cnblogs.com/cobbliu/p/3781558.html