Basic socket/connect/write/read/close sample using BSD sockets from CLIB.
/* Basic BSD client App */
/*
* ANSI
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* BSD specific
*/
#include <netinet/in.h> /* sockaddr_in, */
#include <unistd.h> /* close, write, read */
#include <sys/socket.h> /* most bsd calls */
#include <arpa/inet.h> /* inet_addr */
#define INVALID_SOCKET (-1)
/*
* main
*/
extern unsigned short htons();
int main(int argc, char **argv)
{
char *buff;
struct sockaddr_in serverAddr;
int serverSocket = INVALID_SOCKET;
buff = NULL;
if( argc != 3){
printf("Usage: %s IPaddr port", argv[0]);
goto END_ERR;
}
serverAddr.sin_addr.s_addr = inet_addr(argv[1]);
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(atoi(argv[2]));
/*
* open a socket
*/
printf("\r\nCreating the Socket\r\n");
if( ( serverSocket = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET){
perror("socket()");
goto END_ERR;
}
/*
* connect the socket
*/
printf("\r\nConnecting the Socket\r\n");
if( ( connect(serverSocket,
(struct sockaddr *)&serverAddr, sizeof(serverAddr))) == -1){
perror("connect()");
goto END_ERR;
}
printf("\r\nAllocating buffer\r\n");
if( (buff = (char *)malloc(100000)) == NULL){
printf("problem with malloc");
goto END_ERR;
}
memset(buff, '\0', sizeof(buff));
memcpy(buff, "abcdefghijklmnopqrstuvwxyz", (sizeof(buff) - 1));
printf("\r\nSending Buffer %s\r\n", buff);
if( (write(serverSocket, buff, sizeof(buff))) == -1){
perror("write()");
goto END_ERR;
}
printf("\r\nRecieving Buffer\r\n");
if( (read(serverSocket, buff, sizeof(buff))) == -1){
perror("read()");
goto END_ERR;
}
printf(buff);
printf("\r\n\r\nthat was some buffer\r\n");
END_ERR:
if (serverSocket != INVALID_SOCKET)
close(serverSocket);
if( buff != NULL)
free(buff);
return 0;
}
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