1 #ifndef FDPASS_H
2 #define FDPASS_H
3 
4 /* Send data and send_fd (unless it's -1) via sendmsg(). Returns number of
5    bytes sent, or -1 on error. If at least 1 byte was sent, the send_fd was
6    also sent. */
7 ssize_t fd_send(int handle, int send_fd, const void *data, size_t size);
8 
9 /* Receive data and fd via recvmsg(). Returns number of bytes read, 0 on
10    disconnection, or -1 on error. If at least 1 byte was read, the fd is also
11    returned (if it had been sent). If there was no fd received, it's set to
12    -1. See test-istream-unix.c for different test cases. */
13 ssize_t fd_read(int handle, void *data, size_t size, int *fd_r);
14 
15 #endif
16