-// Modified version of library functions in FUSE
-//
-
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/mount.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-
-int send_fd(int sock_fd, int fd)
-{
- int retval;
- struct msghdr msg;
- struct cmsghdr *p_cmsg;
- struct iovec vec;
- size_t cmsgbuf[CMSG_SPACE(sizeof(fd)) / sizeof(size_t)];
- int *p_fds;
- char sendchar = 0;
-
- msg.msg_control = cmsgbuf;
- msg.msg_controllen = sizeof(cmsgbuf);
- p_cmsg = CMSG_FIRSTHDR(&msg);
- p_cmsg->cmsg_level = SOL_SOCKET;
- p_cmsg->cmsg_type = SCM_RIGHTS;
- p_cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
- p_fds = (int *) CMSG_DATA(p_cmsg);
- *p_fds = fd;
- msg.msg_controllen = p_cmsg->cmsg_len;
- msg.msg_name = NULL;
- msg.msg_namelen = 0;
- msg.msg_iov = &vec;
- msg.msg_iovlen = 1;
- msg.msg_flags = 0;
- /* "To pass file descriptors or credentials you need to send/read at
- * least one byte" (man 7 unix) */
- vec.iov_base = &sendchar;
- vec.iov_len = sizeof(sendchar);
- while ((retval = sendmsg(sock_fd, &msg, 0)) == -1 && errno == EINTR);
- if (retval != 1) {
- perror("sending file descriptor");
- return -1;
- }
- return 0;
-}
-
-
-/* return value:
- * >= 0 => fd
- * -1 => error
- */
-int receive_fd(int fd)
-{
- struct msghdr msg;
- struct iovec iov;
- char buf[1];
- int rv;
- size_t ccmsg[CMSG_SPACE(sizeof(int)) / sizeof(size_t)];
- struct cmsghdr *cmsg;
-
- iov.iov_base = buf;
- iov.iov_len = 1;
-
- msg.msg_name = 0;
- msg.msg_namelen = 0;
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- /* old BSD implementations should use msg_accrights instead of
- * msg_control; the interface is different. */
- msg.msg_control = ccmsg;
- msg.msg_controllen = sizeof(ccmsg);
-
- while(((rv = recvmsg(fd, &msg, 0)) == -1) && errno == EINTR);
- if (rv == -1) {
- perror("recvmsg");
- return -1;
- }
- if(!rv) {
- /* EOF */
- return -1;
- }
-
- cmsg = CMSG_FIRSTHDR(&msg);
- if (!cmsg->cmsg_type == SCM_RIGHTS) {
- fprintf(stderr, "got control message of unknown type %d\n",
- cmsg->cmsg_type);
- return -1;
- }
- return *(int*)CMSG_DATA(cmsg);
-}
-