zuki @ LookBusy programming] $ gcc main.c
main.c: In function 'main':
main.c:18: warning: incompatible implicit declaration of built-in function 'bzero'
main.c:29: warning: passing argument 3 of 'accept' makes pointer from integer without a cast

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

int main(int argc,char ** argv[])
{
	int nCheck;

	struct sockaddr_in _saddress, _caddress; // structure containing an internet address

	if (2 != argc)
	{
		printf("USAGE:\n%s port_to_listen",argv[0]);
		return 1;
	}
	int nSocketfd = socket(PF_INET,	SOCK_STREAM,0);
	bzero(&_saddress, sizeof(struct sockaddr_in)); // initializes _saddress to zero
	int nPort = atoi(argv[1]); // convrting the port from a string to integer
	_saddress.sin_addr.s_addr = INADDR_ANY; // initializes to the ip address of the machine on which the server is running
	_saddress.sin_port = htons(nPort); // converts port from host-byte to network-byte
	_saddress.sin_family = AF_INET; // initializes address family to IPv4
	if (bind(nSocketfd, (struct sockaddr *) &_saddress, sizeof(struct sockaddr_in)) < 0) 
	{
		perror("binding error");
		return 1;
	}
	int nLis = listen(nSocketfd, 50);
	int nfdAccept = accept(nSocketfd, (struct sockaddr *) &_saddress, sizeof(struct sockaddr_in));
	return 0;
}

#include <strings.h>

 int accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen);

/* Somewhere earlier */
socklen_t addrlen;

...

addrlen = sizeof(struct sockaddr_in);
int nfdAccept = accept(nSocketfd, (struct sockaddr *) &_saddress, &addrlen);