This patch adds send_pipefd() to pass the pipe file descriptor to destination process.
Signed-off-by: Lei Li <li...@linux.vnet.ibm.com> --- migration-local.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-) diff --git a/migration-local.c b/migration-local.c index 929ed60..f479530 100644 --- a/migration-local.c +++ b/migration-local.c @@ -167,3 +167,49 @@ fail: g_free(s); return NULL; } + + +/* + * Pass a pipe file descriptor to another process. + * + * Return negative value If pipefd < 0. Return 0 on + * success. + * + */ +static int send_pipefd(int sockfd, int pipefd) +{ + struct msghdr msg; + struct iovec iov[1]; + ssize_t ret; + char req[1] = { 0x01 }; + + union { + struct cmsghdr cm; + char control[CMSG_SPACE(sizeof(int))]; + } control_un; + struct cmsghdr *cmptr; + + msg.msg_control = control_un.control; + msg.msg_controllen = sizeof(control_un.control); + + cmptr = CMSG_FIRSTHDR(&msg); + cmptr->cmsg_len = CMSG_LEN(sizeof(int)); + cmptr->cmsg_level = SOL_SOCKET; + cmptr->cmsg_type = SCM_RIGHTS; + *((int *) CMSG_DATA(cmptr)) = pipefd; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + + iov[0].iov_base = req; + iov[0].iov_len = sizeof(req); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + + ret = sendmsg(sockfd, &msg, 0); + if (ret <= 0) { + DPRINTF("sendmsg error: %s\n", strerror(errno)); + } + + return ret; +} -- 1.7.7.6