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864天前/* 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 */ |
} |
} |
