?? server2.c
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/* server.c */#include <stdio.h>#include <string.h>#include <unistd.h>#include <ctype.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <stdlib.h>#include <errno.h>#define MAXLINE 80int port = 8000;intmain( void ){ struct sockaddr_in sin; struct sockaddr_in pin; int listen_fd; int conn_fd; int address_size; char buf[MAXLINE]; char str[INET_ADDRSTRLEN]; int i; int n; int len; bzero( &sin, sizeof( sin ) ); sin.sin_family = AF_INET; sin.sin_addr.s_addr = INADDR_ANY; sin.sin_port = htons( port ); listen_fd = socket( AF_INET, SOCK_STREAM, 0 ); if ( listen_fd == -1 ) { perror( "call to socket" ); exit( 1 ); } n = bind( listen_fd, ( struct sockaddr * ) &sin, sizeof( sin ) ); if ( n == -1 ) { perror( "call to bind" ); exit( 1 ); } n = listen( listen_fd, 20 ); if ( n == -1 ) { perror( "call to listen" ), exit( 1 ); } printf( "Accepting connections ...\n" ); while ( 1 ) { conn_fd = accept( listen_fd, ( struct sockaddr * ) &pin, &address_size ); if ( conn_fd == -1 ) { perror( "call to accept" ); exit( 1 ); } readagain: n = read( conn_fd, buf, MAXLINE ); if ( n == -1 ) { if ( errno == EINTR ) { goto readagain; } else { perror( "call to read" ); exit( 1 ); } } else if ( n == 0 ) { printf( "the other side has been closed.\n" ); close( conn_fd ); continue; } printf( "received from client %s at port %d: %s\n", inet_ntop( AF_INET, &pin.sin_addr, str, sizeof( str ) ), ntohs( pin.sin_port ), buf ); // just convert the characters to upper case len = strlen( buf ); for ( i = 0; i < len; i++ ) { buf[i] = toupper( buf[i] ); } writeagain: n = write( conn_fd, buf, len + 1 ); if ( n == -1 ) { if ( errno == EINTR ) { goto writeagain; } else { printf( "call to write" ); exit( 1 ); } } n = close( conn_fd ); if ( n == -1 ) { perror( "call to close" ); exit( 1 ); } }}
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