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【C】 Linux中服务器端时间

作者:晟睿 / 发布于2014/10/21/ 492


	/* timeserv.c - a socket-based time of day server
	*/
	
	#include <stdio.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	#include <netdb.h>
	#include <time.h>
	#include <strings.h>
	
	#define PORTNUM 13000 /* our time service phone number */
	#define HOSTLEN 256
	#define oops(msg) { perror(msg) ; exit(1) ; }
	
	int main(int ac, char *av[])
	{
	 struct sockaddr_in saddr; /* build our address here */
	 struct hostent *hp; /* this is part of our */
	 char hostname[HOSTLEN]; /* address */
	 int sock_id,sock_fd; /* line id, file desc */
	 FILE *sock_fp; /* use socket as stream */
	 char *ctime(); /* convert secs to string */
	 time_t thetime; /* the time we report */
	
	 /*
	 * Step 1: ask kernel for a socket
	 */
	
	 sock_id = socket( PF_INET, SOCK_STREAM, 0 ); /* get a socket */
	 if ( sock_id == -1 )
	 oops( "socket" );
	
	 /*
	 * Step 2: bind address to socket. Address is host,port
	 */
	
	 bzero( (void *)&saddr, sizeof(saddr) ); /* clear out struct */
	
	 gethostname( hostname, HOSTLEN ); /* where am I ? */
	 hp = gethostbyname( hostname ); /* get info about host */
	 /* fill in host part */
	 bcopy( (void *)hp->h_addr, (void *)&saddr.sin_addr, hp->h_length);
	 saddr.sin_port = htons(PORTNUM); /* fill in socket port */
	 saddr.sin_family = AF_INET ; /* fill in addr family */
	
	 if ( bind(sock_id, (struct sockaddr *)&saddr, sizeof(saddr)) != 0 )
	 oops( "bind" );
	
	 /*
	 * Step 3: allow incoming calls with Qsize=1 on socket
	 */
	
	 if ( listen(sock_id, 1) != 0 )
	 oops( "listen" );
	
	 /*
	 * main loop: accept(), write(), close()
	 */
	
	 while ( 1 ){
	 sock_fd = accept(sock_id, NULL, NULL); /* wait for call */
	 printf("Wow! got a call!\n");
	 if ( sock_fd == -1 )
	 oops( "accept" ); /* error getting calls */
	
	 sock_fp = fdopen(sock_fd,"w"); /* we'll write to the */
	 if ( sock_fp == NULL ) /* socket as a stream */
	 oops( "fdopen" ); /* unless we can't */
	
	 thetime = time(NULL); /* get time */
	 /* and convert to strng */
	 fprintf( sock_fp, "The time here is .." );
	 fprintf( sock_fp, "%s", ctime(&thetime) );
	 fclose( sock_fp ); /* release connection */
	 }
	}

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　服务器端时间　　服务器端　　时间　

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