Socket programming : Accept return 0. Post: 302140811

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Top Forums UNIX for Dummies Questions & Answers Socket programming : Accept return 0. Post 302140811 by abc.working on Tuesday 16th of October 2007 06:49:01 AM

10-16-2007

Registered User

Server code:

Code:

#define MYPORT 1034
int main()
{
 struct sockaddr_in sin;
 struct sockaddr_in cin;
 int s = socket(PF_INET,SOCK_STREAM,0);
 sin.sin_family = AF_INET;
 sin.sin_port = htons(MYPORT);
 sin.sin_addr.s_addr = INADDR_ANY;
 memset(sin.sin_zero,'\0',sizeof(sin.sin_zero));
 int check=bind(s,(struct sockaddr *)&sin,sizeof(sin));
 check=listen(s,5);
 addrlen=sizeof(cin);
//My server waits when below line is encountered
 s_client = accept(s,(struct sockaddr *)&cin,&addrlen);
//once client runs and connect is executed accept returns 0
 printf("hi %s\n",inet_ntoa(cin.sin_addr));
 char *buf;
 //the below recv is non blocking, it doesn't wait for client to send.
 recv(s_client,buf,100,0);
}

Client code:

Code:

int main(int argc,char *argv[])
{
 struct sockaddr_in sin;
 struct sockaddr_in cin;
 struct hostent *hp;
 hp=gethostbyname(argv[1]);
 cin.sin_family = AF_INET;
 cin.sin_addr = *((struct in_addr *)hp->h_addr);
 cin.sin_port = htons(MYPORT);
 memset(cin1.sin_zero,'\0',sizeof(cin.sin_zero));
 int s = socket(PF_INET,SOCK_STREAM,0);
 int check = connect(s,(struct sockaddr *)&cin,sizeof(cin));
 char buf[100] = "from client";
 int len = strlen(buf);
 int bytes_sent = send(s,buf,len,0);
 printf("%d",bytes_sent); // output is 11
}

Last edited by vino; 10-16-2007 at 07:58 AM.. Reason: Added code tags

abc.working

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bindresvport

BINDRESVPORT(3) 					     Linux Programmer's Manual						   BINDRESVPORT(3)

NAME

       bindresvport - bind a socket to a privileged IP port

SYNOPSIS

       #include <sys/types.h>
       #include <netinet/in.h>

       int bindresvport(int sockfd, struct sockaddr_in *sin);

DESCRIPTION

       bindresvport()  is used to bind a socket descriptor to a privileged anonymous IP port, that is, a port number arbitrarily selected from the
       range 512 to 1023.

       If the bind(2) performed by bindresvport() is successful, and sin is not NULL, then sin->sin_port returns the port  number  actually  allo-
       cated.

       sin  can  be  NULL,  in	which case sin->sin_family is implicitly taken to be AF_INET.  However, in this case, bindresvport() has no way to
       return the port number actually allocated.  (This information can later be obtained using getsockname(2).)

RETURN VALUE

       bindresvport() returns 0 on success; otherwise -1 is returned and errno set to indicate the cause of the error.

ERRORS

       bindresvport() can fail for any of the same reasons as bind(2).	In addition, the following errors may occur:

       EACCES The caller did not have superuser privilege (to be precise: the CAP_NET_BIND_SERVICE capability is required).

       EADDRINUSE
	      All privileged ports are in use.

       EAFNOSUPPORT (EPFNOSUPPORT in glibc 2.7 and earlier)
	      sin is not NULL and sin->sin_family is not AF_INET.

CONFORMING TO

       Not in POSIX.1-2001.  Present on the BSDs, Solaris, and many other systems.

NOTES

       Unlike some bindresvport() implementations, the glibc implementation ignores any value that the caller supplies in sin->sin_port.

SEE ALSO

       bind(2), getsockname(2)

COLOPHON

       This page is part of release 3.44 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/.

								    2008-12-03							   BINDRESVPORT(3)

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