linux tcp server demo
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#include <sys/types.h> #include <sys/socket.h> #include <string.h> #include <netinet/in.h> #include <stdio.h> #include <stdlib.h> #define MAXLINE 80 #define SERV_PORT 6970 void
do_echo( int
sockfd, struct
sockaddr *pcliaddr, socklen_t clilen) { int
n; socklen_t len; char
mesg[MAXLINE]; for (;;) { len = clilen; /* waiting for receive data */ n = recvfrom(sockfd, mesg, MAXLINE, 0, pcliaddr, &len); /* sent data back to client */ printf( "receieve: %s\n" ,mesg); fflush ( stdout ) ; sendto(sockfd, mesg, n, 0, pcliaddr, len); } } int
main( void ) { int
sockfd; struct
sockaddr_in servaddr, cliaddr; sockfd = socket(AF_INET, SOCK_DGRAM, 0); /* create a socket */ /* init servaddr */ bzero(&servaddr, sizeof (servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY); servaddr.sin_port = htons(SERV_PORT); /* bind address and port to socket */ if (bind(sockfd, ( struct
sockaddr *)&servaddr, sizeof (servaddr)) == -1) { perror( "bind error" ); exit(1); } do_echo(sockfd, ( struct
sockaddr *)&cliaddr, sizeof (cliaddr)); return
0; } |
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