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recvfd.md

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Name

recvfd - receive a file descriptor from a local socket peer

Synopsis

#include <sys/socket.h>

int recvfd(int sockfd, int options);

Description

Receive an open file descriptor from a local socket peer connected via sockfd. This is a non-blocking call that will fail if there is no file descriptor waiting in the socket's queue.

File descriptors are sent out-of-band and do not affect the regular data streams.

The options argument accepts a bitmask of the following flags:

  • O_CLOEXEC: The opened fd shall be closed on exec(2).

Return value

If a file descriptor is successfully received, it is returned as a non-negative integer. Otherwise, -1 is returned and errno is set to indicate the error.

Errors

  • EBADF: sockfd is not an open file descriptor.
  • ENOTSOCK: sockfd does not refer to a socket.
  • EAFNOSUPPORT: sockfd does not refer to a local domain socket.
  • EINVAL: sockfd does not refer to a connected or accepted socket.
  • EAGAIN: There is no file descriptor queued on this socket.

History

recvfd() was first introduced in Plan 9 from User Space.

See also