why daytime don't work? Post: 302322903

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Top Forums Programming why daytime don't work? Post 302322903 by konvalo on Thursday 4th of June 2009 11:12:07 PM

06-05-2009

Registered User

why daytime don't work?

Following code is detecting solaris daytime,when I run it,I can't get any result,code is follows:

Code:

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFSIZE 150
int main(){
  struct sockaddr_in serv;
  char buff[BUFFSIZE];
  int sockfd,n;
  if((sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)
     err_sys("socket error");
  bzero((char *)&serv,sizeof(serv));
  serv.sin_family=AF_INET;
  serv.sin_addr.s_addr=inet_addr("10.10.10.9");
  serv.sin_port=htons(13);
  if(sendto(sockfd,buff,BUFFSIZE,0,(struct sockaddr *)&serv,sizeof(serv))!=BUFFSIZE)
     err_sys("sendto error");
  if((n=recvfrom(sockfd,buff,BUFFSIZE,0,(struct sockaddr *)NULL,(int *)NULL))<2)
     err_sys("recvfrom error");
  buff[n-2]=0;
  printf("%s\n",buff);
}

$a.out
aa --here I input a line

I can't get any information from daytime, the code is under the same machine '10.10.10.0". Why I can't get information of daytime?

Thanks

konvalo

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shutdown

SHUTDOWN(2)						     Linux Programmer's Manual						       SHUTDOWN(2)

NAME

       shutdown - shut down part of a full-duplex connection

SYNOPSIS

       #include <sys/socket.h>

       int shutdown(int sockfd, int how);

DESCRIPTION

       The  shutdown()	call  causes  all  or  part  of  a full-duplex connection on the socket associated with sockfd to be shut down.  If how is
       SHUT_RD, further receptions will be disallowed.	If how is SHUT_WR, further transmissions will be disallowed.  If how is SHUT_RDWR, further
       receptions and transmissions will be disallowed.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EBADF  sockfd is not a valid descriptor.

       ENOTCONN
	      The specified socket is not connected.

       ENOTSOCK
	      sockfd is a file, not a socket.

CONFORMING TO

       POSIX.1-2001, 4.4BSD (the shutdown() function call first appeared in 4.2BSD).

NOTES

       The constants SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, respectively, and are defined in <sys/socket.h> since glibc-2.1.91.

SEE ALSO

       connect(2), socket(2), socket(7)

COLOPHON

       This  page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-12-03							       SHUTDOWN(2)