Accept(): Invalid Argument

bonhomme · 07-27-2004, 12:34 PM

Hi guys,

I'm trying to create a simple server using C. I'm running RH 7.2. When my code runs the following code segment, it returns with the following error:

accept(): invalid argument

I'm not sure why I'm getting this message since my arguments seem to be of the correct type. Anyway, here's my code:

Code:

for (;;)
{
   struct sockaddr_in clientName = {0};
   int slaveSocket, clientLength = sizeof(clientName);

   (void) memset(&clientName, 0, sizeof(clientName));

   slaveSocket = accept(serverSocket, (struct sockaddr *) &clientName, &clientLength);

   if (-1 == slaveSocket)
   {
      perror("accept()");
      exit(1);
   }

/* irrelevant code follows */

Anyone have any suggestions? Thanks.

infamous41md · 07-27-2004, 12:49 PM

printf value of serverSocket.

bonhomme · 07-27-2004, 03:29 PM

When I printf the value of serverSocket, it has the value "3" from the socket() call. Is this a clue?

itsme86 · 07-27-2004, 03:37 PM

Quote:

EINVAL Socket is not listening for connections.

Check out 'man listen'.

Quote:

SYNOPSIS
#include <sys/socket.h>

int listen(int s, int backlog);

DESCRIPTION
To accept connections, a socket is first created with
socket(2), a willingness to accept incoming connections
and a queue limit for incoming connections are specified
with listen, and then the connections are accepted with
accept(2). The listen call applies only to sockets of
type SOCK_STREAM or SOCK_SEQPACKET.