sendto

sendto

Sends a Message to a Socket

Portability: UNIX compatible

SYNOPSIS
DESCRIPTION
RETURN VALUE
PORTABILITY
RELATED FUNCTIONS

SYNOPSIS

#include <sys/types.h>
#include <sys/socket.h>

int sendto(int s, const void *buf, int len, int flags,
           const void *to, int addrlen);

DESCRIPTION

sendto transmits a message from the area pointed to by buf of length len to socket descriptor s . to is the target address; addrlen is the address size. sendto can be used on any type of socket. It is most commonly used for unconnected datagram sockets for which different destinations may be associated with different datagrams.

flags consists of the following:

MSG_OOB: requests that message buffers be sent as out-of-band data.
MSG_DONTROUTE: bypasses routing; uses the network portion of the destination address to select a network interface.

RETURN VALUE

If sendto succeeds, it returns the number of characters sent. If there is an error, it returns a -1 .

PORTABILITY

sendto is portable to other environments, including most UNIX systems, that implement BSD sockets.

RELATED FUNCTIONS

recv , recvfrom , recvmsg , send , sendmsg , write

Chapter Contents
Previous
Next
Top of Page