mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 18:02:44 +00:00
38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
## Name
|
|
|
|
sendfd - send a file descriptor to a local socket peer
|
|
|
|
## Synopsis
|
|
|
|
```**c++
|
|
#include <sys/socket.h>
|
|
|
|
int sendfd(int sockfd, int fd);
|
|
```
|
|
|
|
## Description
|
|
|
|
Send an open file descriptor to a local socket peer connected via `sockfd`. This is a non-blocking call that will fail if there are too many file descriptors already waiting to be received by the peer.
|
|
|
|
File descriptors are sent out-of-band and do not affect the regular data streams.
|
|
|
|
## Return value
|
|
|
|
If a file descriptor is successfully sent, `sendfd()` returns 0. Otherwise, -1 is returned and `errno` is set to indicate the error.
|
|
|
|
## Errors
|
|
|
|
* `EBADF`: `sockfd` or `fd` is not an open file descriptor.
|
|
* `ENOTSOCK`: `sockfd` does not refer to a socket.
|
|
* `EAFNOSUPPORT`: `sockfd` does not refer to a local domain socket.
|
|
* `ENOTCONN`: `sockfd` refers to a socket which is not connected.
|
|
* `EINVAL`: `sockfd` does not refer to a connected or accepted socket.
|
|
* `EBUSY`: There are too many file descriptors already waiting to be received by the peer.
|
|
|
|
## History
|
|
|
|
`sendfd()` was first introduced in Plan 9 from User Space.
|
|
|
|
## See also
|
|
|
|
* [`recvfd`(2)](recvfd.md)
|