[libvirt] [PATCH v8 1/7] qemu-char: Add MSG_CMSG_CLOEXEC flag to recvmsg

Set the close-on-exec flag for the file descriptor received via SCM_RIGHTS. Signed-off-by: Corey Bryant <coreyb(a)linux.vnet.ibm.com&gt; --- v4 -This patch is new in v4 (eblake(a)redhat.com) v5 -Fallback to FD_CLOEXEC if MSG_CMSG_CLOEXEC is not available (eblake(a)redhat.com, stefanha(a)linux.vnet.ibm.com) v6 -Set cloexec on correct fd (eblake(a)redhat.com) v7-v8 -No changes qemu-char.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/qemu-char.c b/qemu-char.c index c2aaaee..ab4a928 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -2238,6 +2238,9 @@ static void unix_process_msgfd(CharDriverState *chr, struct msghdr *msg) if (fd < 0) continue; +#ifndef MSG_CMSG_CLOEXEC + qemu_set_cloexec(fd); +#endif if (s->msgfd != -1) close(s->msgfd); s->msgfd = fd; @@ -2253,6 +2256,7 @@ static ssize_t tcp_chr_recv(CharDriverState *chr, char *buf, size_t len) struct cmsghdr cmsg; char control[CMSG_SPACE(sizeof(int))]; } msg_control; + int flags = 0; ssize_t ret; iov[0].iov_base = buf; @@ -2263,9 +2267,13 @@ static ssize_t tcp_chr_recv(CharDriverState *chr, char *buf, size_t len) msg.msg_control = &msg_control; msg.msg_controllen = sizeof(msg_control); - ret = recvmsg(s->fd, &msg, 0); - if (ret > 0 && s->is_unix) +#ifdef MSG_CMSG_CLOEXEC + flags |= MSG_CMSG_CLOEXEC; +#endif + ret = recvmsg(s->fd, &msg, flags); + if (ret > 0 && s->is_unix) { unix_process_msgfd(chr, &msg); + } return ret; } -- 1.7.10.4