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linux tcp server demo
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #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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