From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50098) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VmKyV-0007nv-R7 for qemu-devel@nongnu.org; Fri, 29 Nov 2013 05:07:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VmKyK-0007uU-Og for qemu-devel@nongnu.org; Fri, 29 Nov 2013 05:07:03 -0500 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:54287) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VmKyJ-0007ta-Nq for qemu-devel@nongnu.org; Fri, 29 Nov 2013 05:06:52 -0500 Received: from /spool/local by e23smtp06.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 29 Nov 2013 20:06:49 +1000 Received: from d23relay04.au.ibm.com (d23relay04.au.ibm.com [9.190.234.120]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 49BFA2BB0054 for ; Fri, 29 Nov 2013 21:06:47 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay04.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id rAT9mnSq8585640 for ; Fri, 29 Nov 2013 20:48:49 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id rATA6kN5012311 for ; Fri, 29 Nov 2013 21:06:46 +1100 From: Lei Li Date: Fri, 29 Nov 2013 18:06:13 +0800 Message-Id: <1385719584-21114-7-git-send-email-lilei@linux.vnet.ibm.com> In-Reply-To: <1385719584-21114-1-git-send-email-lilei@linux.vnet.ibm.com> References: <1385719584-21114-1-git-send-email-lilei@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 06/17] migration-local: add send_pipefd() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: aarcange@redhat.com, Lei Li , quintela@redhat.com, mrhines@linux.vnet.ibm.com, aliguori@amazon.com, lagarcia@br.ibm.com, pbonzini@redhat.com, rcj@linux.vnet.ibm.com This patch adds send_pipefd() to pass the pipe file descriptor to destination process. Signed-off-by: Lei Li --- 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