1 KiB
1 KiB
Name
recvfd - receive a file descriptor from a local socket peer
Synopsis
#include <sys/socket.h>
int recvfd(int sockfd);
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.
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:sockfdis not an open file descriptor.ENOTSOCK:sockfddoes not refer to a socket.EAFNOSUPPORT:sockfddoes not refer to a local domain socket.EINVAL:sockfddoes 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.