BSD Sockets Interface Programmer's Guide

44 Chapter 2

Using Internet Stream Sockets

Sending and Receiving Data

Function result: number of bytes actually sent, –1 if failure occurs.

Example:

count = send (s, buf, 10, 0);

send blocks until the speciﬁed number of bytes have been queued to be

sent, unless you are using nonblocking I/O.

When to Send Data

The server or client process should send data after the connection is

established. Refer to the send(2) man page for more information on

send.

Receiving Data

recv and its parameters are described in the following table.

Include ﬁles: #include <sys/types.h>

#include <sys/socket.h>

System call: count = recv(s,buf,len,flags)

int s;

char *buf;

int len, flags;

msg pointer to data buffer pointer to data to be sent

len size of data buffer size of msg

ﬂags settings for optional ﬂags 0 or MSG_OOB

Parameter

Description of

Contents

INPUT Value