| 5 | #include <string.h> |
| 6 | |
| 7 | bool fdpass_send(int sockout, int fd) |
| 8 | { |
| 9 | /* From the cmsg(3) manpage: */ |
| 10 | struct msghdr msg = { 0 }; |
| 11 | struct cmsghdr *cmsg; |
| 12 | struct iovec iov; |
| 13 | char c = 0; |
| 14 | union { /* Ancillary data buffer, wrapped in a union |
| 15 | in order to ensure it is suitably aligned */ |
| 16 | char buf[CMSG_SPACE(sizeof(fd))]; |
| 17 | struct cmsghdr align; |
| 18 | } u; |
| 19 | |
| 20 | msg.msg_control = u.buf; |
| 21 | msg.msg_controllen = sizeof(u.buf); |
| 22 | memset(&u, 0, sizeof(u)); |
| 23 | cmsg = CMSG_FIRSTHDR(&msg); |
| 24 | cmsg->cmsg_level = SOL_SOCKET; |
| 25 | cmsg->cmsg_type = SCM_RIGHTS; |
| 26 | cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); |
| 27 | memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); |
| 28 | |
| 29 | msg.msg_name = NULL; |
| 30 | msg.msg_namelen = 0; |
| 31 | msg.msg_iov = &iov; |
| 32 | msg.msg_iovlen = 1; |
| 33 | msg.msg_flags = 0; |
| 34 | |
| 35 | /* Keith Packard reports that 0-length sends don't work, so we |
| 36 | * always send 1 byte. */ |
| 37 | iov.iov_base = &c; |
| 38 | iov.iov_len = 1; |
| 39 | |
| 40 | return sendmsg(sockout, &msg, 0) == 1; |
| 41 | } |
| 42 | |
| 43 | int fdpass_recv(int sockin) |
| 44 | { |
no outgoing calls