pr_sendto.md - mozsearch

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# PR_SendTo

Sends bytes a socket to a specified destination.

## Syntax

```{code}

#include <prio.h>

PRInt32 PR_SendTo(

  PRFileDesc *fd,

  const void *buf,

  PRInt32 amount,

  PRIntn flags,

  const PRNetAddr *addr,

  PRIntervalTime timeout);

```

### Parameters

The function has the following parameters:

`fd`

: A pointer to a {ref}`PRFileDesc` object representing a socket.

`buf`

: A pointer to a buffer containing the data to be sent.

`amount`

: The size of `buf` (in bytes).

`flags`

: This obsolete parameter must always be zero.

`addr`

: A pointer to the address of the destination.

`timeout`

: A value of type {ref}`PRIntervalTime` specifying the time limit for

  completion of the receive operation.

### Returns

The function returns one of the following values:

- A positive number indicates the number of bytes successfully sent.

- The value -1 indicates a failure. The reason for the failure can be

  obtained by calling {ref}`PR_GetError`.

## Description

{ref}`PR_SendTo` sends a specified number of bytes from a socket to the

specified destination address. The calling thread blocks until all bytes

are sent, a timeout has occurred, or there is an error.