* [Qemu-devel] [PATCH 1/5] qemu-fd-exchange: provide common methods for exchange fd
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
@ 2014-01-23 8:27 ` Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 2/5] qemu-bridge-helper: replace send_fd with qemu_send_with_fd Lei Li
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Lei Li @ 2014-01-23 8:27 UTC (permalink / raw)
To: qemu-devel; +Cc: mohan, Lei Li, pbonzini
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
include/qemu/fd-exchange.h | 25 +++++++++++
util/Makefile.objs | 1 +
util/qemu-fd-exchange.c | 97 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 123 insertions(+), 0 deletions(-)
create mode 100644 include/qemu/fd-exchange.h
create mode 100644 util/qemu-fd-exchange.c
diff --git a/include/qemu/fd-exchange.h b/include/qemu/fd-exchange.h
new file mode 100644
index 0000000..8502960
--- /dev/null
+++ b/include/qemu/fd-exchange.h
@@ -0,0 +1,25 @@
+/*
+ * Internal common methods for exchange of FD
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef FD_EXCHANGE_H
+#define FD_EXCHANGE_H
+
+#include <sys/socket.h>
+
+union MsgControl {
+ struct cmsghdr cmsg;
+ char control[CMSG_SPACE(sizeof(int))];
+};
+
+ssize_t qemu_send_with_fd(int sockfd, int passed_fd,
+ const void *buf, size_t len);
+
+ssize_t qemu_recv_with_fd(int sockfd, int *passed_fd,
+ void *buf, size_t len);
+
+#endif
diff --git a/util/Makefile.objs b/util/Makefile.objs
index af3e5cb..2fb42bf 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -13,3 +13,4 @@ util-obj-y += hexdump.o
util-obj-y += crc32c.o
util-obj-y += throttle.o
util-obj-y += getauxval.o
+util-obj-y += qemu-fd-exchange.o
diff --git a/util/qemu-fd-exchange.c b/util/qemu-fd-exchange.c
new file mode 100644
index 0000000..bee3fc1
--- /dev/null
+++ b/util/qemu-fd-exchange.c
@@ -0,0 +1,97 @@
+/*
+ * Internal common methods for exchange of FD
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/fd-exchange.h"
+#include "qemu-common.h"
+
+
+ssize_t qemu_send_with_fd(int sockfd, int passed_fd,
+ const void *buf, size_t len)
+{
+ struct msghdr msg;
+ struct iovec iov;
+ struct cmsghdr *cmsg;
+ union MsgControl msg_control;
+ int retval;
+
+ iov.iov_base = (char *)buf;
+ iov.iov_len = len;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = len;
+ msg.msg_control = &msg_control;
+ msg.msg_controllen = sizeof(msg_control);
+
+ if (passed_fd < 0) {
+ *(char *)buf = passed_fd;
+ } else {
+ msg.msg_control = &msg_control;
+ msg.msg_controllen = sizeof(msg_control);
+
+ cmsg = &msg_control.cmsg;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(passed_fd));
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ memcpy(CMSG_DATA(cmsg), &passed_fd, sizeof(passed_fd));
+
+ }
+
+ do {
+ retval = sendmsg(sockfd, &msg, 0);
+ } while (retval < 0 && errno == EINTR);
+
+ return retval;
+}
+
+ssize_t qemu_recv_with_fd(int sockfd, int *passed_fd,
+ void *buf, size_t len)
+{
+ struct iovec iov;
+ struct msghdr msg;
+ struct cmsghdr *cmsg;
+ union MsgControl msg_control;
+ int retval;
+ char data;
+
+ iov.iov_base = &data;
+ iov.iov_len = len;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+ msg.msg_control = &msg_control;
+ msg.msg_controllen = sizeof(msg_control);
+
+ do {
+ retval = recvmsg(sockfd, &msg, 0);
+ } while (retval < 0 && errno == EINTR);
+
+ if (retval <= 0) {
+ return retval;
+ }
+
+ if (data != *(char *)buf) {
+ *passed_fd = data;
+ return 0;
+ }
+
+ for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
+ cmsg->cmsg_level != SOL_SOCKET ||
+ cmsg->cmsg_type != SCM_RIGHTS) {
+ continue;
+ }
+
+ memcpy(passed_fd, CMSG_DATA(cmsg), sizeof(*passed_fd));
+ return 0;
+ }
+
+ *passed_fd = -ENFILE;
+ return retval;
+}
--
1.7.7.6
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH 2/5] qemu-bridge-helper: replace send_fd with qemu_send_with_fd
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 1/5] qemu-fd-exchange: provide common methods for exchange fd Lei Li
@ 2014-01-23 8:27 ` Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 3/5] net/tap: replace recv_fd with qemu_recv_with_fd Lei Li
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Lei Li @ 2014-01-23 8:27 UTC (permalink / raw)
To: qemu-devel; +Cc: mohan, Lei Li, pbonzini
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
Makefile | 2 +-
qemu-bridge-helper.c | 31 +++----------------------------
2 files changed, 4 insertions(+), 29 deletions(-)
diff --git a/Makefile b/Makefile
index bdff4e4..6850f35 100644
--- a/Makefile
+++ b/Makefile
@@ -195,7 +195,7 @@ qemu-img$(EXESUF): qemu-img.o $(block-obj-y) libqemuutil.a libqemustub.a
qemu-nbd$(EXESUF): qemu-nbd.o $(block-obj-y) libqemuutil.a libqemustub.a
qemu-io$(EXESUF): qemu-io.o $(block-obj-y) libqemuutil.a libqemustub.a
-qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o
+qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o libqemuutil.a
fsdev/virtfs-proxy-helper$(EXESUF): fsdev/virtfs-proxy-helper.o fsdev/virtio-9p-marshal.o libqemuutil.a libqemustub.a
fsdev/virtfs-proxy-helper$(EXESUF): LIBS += -lcap
diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c
index 6a0974e..8303b6b 100644
--- a/qemu-bridge-helper.c
+++ b/qemu-bridge-helper.c
@@ -40,6 +40,7 @@
#endif
#include "qemu/queue.h"
+#include "qemu/fd-exchange.h"
#include "net/tap-linux.h"
@@ -174,33 +175,6 @@ static void prep_ifreq(struct ifreq *ifr, const char *ifname)
snprintf(ifr->ifr_name, IFNAMSIZ, "%s", ifname);
}
-static int send_fd(int c, int fd)
-{
- char msgbuf[CMSG_SPACE(sizeof(fd))];
- struct msghdr msg = {
- .msg_control = msgbuf,
- .msg_controllen = sizeof(msgbuf),
- };
- struct cmsghdr *cmsg;
- struct iovec iov;
- char req[1] = { 0x00 };
-
- cmsg = CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
- msg.msg_controllen = cmsg->cmsg_len;
-
- iov.iov_base = req;
- iov.iov_len = sizeof(req);
-
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
-
- return sendmsg(c, &msg, 0);
-}
-
#ifdef CONFIG_LIBCAP
static int drop_privileges(void)
{
@@ -239,6 +213,7 @@ int main(int argc, char **argv)
ACLList acl_list;
int access_allowed, access_denied;
int ret = EXIT_SUCCESS;
+ char req[1] = { 0x00 };
#ifdef CONFIG_LIBCAP
/* if we're run from an suid binary, immediately drop privileges preserving
@@ -424,7 +399,7 @@ int main(int argc, char **argv)
}
/* write fd to the domain socket */
- if (send_fd(unixfd, fd) == -1) {
+ if (qemu_send_with_fd(unixfd, fd, &req, sizeof(req)) == -1) {
fprintf(stderr, "failed to write fd to unix socket: %s\n",
strerror(errno));
ret = EXIT_FAILURE;
--
1.7.7.6
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH 3/5] net/tap: replace recv_fd with qemu_recv_with_fd
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 1/5] qemu-fd-exchange: provide common methods for exchange fd Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 2/5] qemu-bridge-helper: replace send_fd with qemu_send_with_fd Lei Li
@ 2014-01-23 8:27 ` Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 4/5] virtfs-proxy-helper: replace send_fd with qemu_send_with_fd Lei Li
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Lei Li @ 2014-01-23 8:27 UTC (permalink / raw)
To: qemu-devel; +Cc: mohan, Lei Li, pbonzini
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
net/tap.c | 40 +++-------------------------------------
1 files changed, 3 insertions(+), 37 deletions(-)
diff --git a/net/tap.c b/net/tap.c
index 39c1cda..97ee2e8 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -39,6 +39,7 @@
#include "sysemu/sysemu.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
+#include "qemu/fd-exchange.h"
#include "net/tap.h"
@@ -385,40 +386,6 @@ static int launch_script(const char *setup_script, const char *ifname, int fd)
return -1;
}
-static int recv_fd(int c)
-{
- int fd;
- uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
- struct msghdr msg = {
- .msg_control = msgbuf,
- .msg_controllen = sizeof(msgbuf),
- };
- struct cmsghdr *cmsg;
- struct iovec iov;
- uint8_t req[1];
- ssize_t len;
-
- cmsg = CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
- msg.msg_controllen = cmsg->cmsg_len;
-
- iov.iov_base = req;
- iov.iov_len = sizeof(req);
-
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
-
- len = recvmsg(c, &msg, 0);
- if (len > 0) {
- memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
- return fd;
- }
-
- return len;
-}
-
static int net_bridge_run_helper(const char *helper, const char *bridge)
{
sigset_t oldmask, mask;
@@ -489,12 +456,11 @@ static int net_bridge_run_helper(const char *helper, const char *bridge)
} else if (pid > 0) {
int fd;
+ char req[1] = { 0x00 };
close(sv[1]);
- do {
- fd = recv_fd(sv[0]);
- } while (fd == -1 && errno == EINTR);
+ qemu_recv_with_fd(sv[0], &fd, &req, sizeof(req));
close(sv[0]);
--
1.7.7.6
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH 4/5] virtfs-proxy-helper: replace send_fd with qemu_send_with_fd
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
` (2 preceding siblings ...)
2014-01-23 8:27 ` [Qemu-devel] [PATCH 3/5] net/tap: replace recv_fd with qemu_recv_with_fd Lei Li
@ 2014-01-23 8:27 ` Lei Li
2014-01-23 8:27 ` [Qemu-devel] [PATCH 5/5] virtio-9p-proxy: replace v9fs_receivefd with qemu_recv_with_fd Lei Li
2014-01-23 18:55 ` [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Antonios Motakis
5 siblings, 0 replies; 7+ messages in thread
From: Lei Li @ 2014-01-23 8:27 UTC (permalink / raw)
To: qemu-devel; +Cc: mohan, Lei Li, pbonzini
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
fsdev/virtfs-proxy-helper.c | 51 ++++++------------------------------------
hw/9pfs/virtio-9p-proxy.h | 5 ----
2 files changed, 8 insertions(+), 48 deletions(-)
diff --git a/fsdev/virtfs-proxy-helper.c b/fsdev/virtfs-proxy-helper.c
index 713a7b2..44c6e61 100644
--- a/fsdev/virtfs-proxy-helper.c
+++ b/fsdev/virtfs-proxy-helper.c
@@ -23,6 +23,7 @@
#include "qemu-common.h"
#include "qemu/sockets.h"
#include "qemu/xattr.h"
+#include "qemu/fd-exchange.h"
#include "virtio-9p-marshal.h"
#include "hw/9pfs/virtio-9p-proxy.h"
#include "fsdev/virtio-9p-marshal.h"
@@ -203,48 +204,6 @@ static int read_request(int sockfd, struct iovec *iovec, ProxyHeader *header)
return 0;
}
-static int send_fd(int sockfd, int fd)
-{
- struct msghdr msg;
- struct iovec iov;
- int retval, data;
- struct cmsghdr *cmsg;
- union MsgControl msg_control;
-
- iov.iov_base = &data;
- iov.iov_len = sizeof(data);
-
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- /* No ancillary data on error */
- if (fd < 0) {
- /* fd is really negative errno if the request failed */
- data = fd;
- } else {
- data = V9FS_FD_VALID;
- msg.msg_control = &msg_control;
- msg.msg_controllen = sizeof(msg_control);
-
- cmsg = &msg_control.cmsg;
- cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
- cmsg->cmsg_level = SOL_SOCKET;
- cmsg->cmsg_type = SCM_RIGHTS;
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
- }
-
- do {
- retval = sendmsg(sockfd, &msg, 0);
- } while (retval < 0 && errno == EINTR);
- if (fd >= 0) {
- close(fd);
- }
- if (retval < 0) {
- return retval;
- }
- return 0;
-}
-
static int send_status(int sockfd, struct iovec *iovec, int status)
{
ProxyHeader header;
@@ -784,11 +743,17 @@ static void usage(char *prog)
static int process_reply(int sock, int type,
struct iovec *out_iovec, int retval)
{
+ int data = V9FS_FD_VALID;
+
switch (type) {
case T_OPEN:
case T_CREATE:
- if (send_fd(sock, retval) < 0) {
+ if (qemu_send_with_fd(sock, retval, &data, sizeof(data)) < 0) {
return -1;
+ } else {
+ if (retval >= 0) {
+ close(retval);
+ }
}
break;
case T_MKNOD:
diff --git a/hw/9pfs/virtio-9p-proxy.h b/hw/9pfs/virtio-9p-proxy.h
index 005c1ad..e359ac5 100644
--- a/hw/9pfs/virtio-9p-proxy.h
+++ b/hw/9pfs/virtio-9p-proxy.h
@@ -24,11 +24,6 @@
#define proxy_marshal(out_sg, offset, fmt, args...) \
v9fs_marshal(out_sg, 1, offset, 0, fmt, ##args)
-union MsgControl {
- struct cmsghdr cmsg;
- char control[CMSG_SPACE(sizeof(int))];
-};
-
typedef struct {
uint32_t type;
uint32_t size;
--
1.7.7.6
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [PATCH 5/5] virtio-9p-proxy: replace v9fs_receivefd with qemu_recv_with_fd
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
` (3 preceding siblings ...)
2014-01-23 8:27 ` [Qemu-devel] [PATCH 4/5] virtfs-proxy-helper: replace send_fd with qemu_send_with_fd Lei Li
@ 2014-01-23 8:27 ` Lei Li
2014-01-23 18:55 ` [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Antonios Motakis
5 siblings, 0 replies; 7+ messages in thread
From: Lei Li @ 2014-01-23 8:27 UTC (permalink / raw)
To: qemu-devel; +Cc: mohan, Lei Li, pbonzini
Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
hw/9pfs/virtio-9p-proxy.c | 60 ++------------------------------------------
1 files changed, 3 insertions(+), 57 deletions(-)
diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c
index 5f44bb7..f34b845 100644
--- a/hw/9pfs/virtio-9p-proxy.c
+++ b/hw/9pfs/virtio-9p-proxy.c
@@ -14,6 +14,7 @@
#include "hw/virtio/virtio.h"
#include "virtio-9p.h"
#include "qemu/error-report.h"
+#include "qemu/fd-exchange.h"
#include "fsdev/qemu-fsdev.h"
#include "virtio-9p-proxy.h"
@@ -24,62 +25,6 @@ typedef struct V9fsProxy {
struct iovec out_iovec;
} V9fsProxy;
-/*
- * Return received file descriptor on success in *status.
- * errno is also returned on *status (which will be < 0)
- * return < 0 on transport error.
- */
-static int v9fs_receivefd(int sockfd, int *status)
-{
- struct iovec iov;
- struct msghdr msg;
- struct cmsghdr *cmsg;
- int retval, data, fd;
- union MsgControl msg_control;
-
- iov.iov_base = &data;
- iov.iov_len = sizeof(data);
-
- memset(&msg, 0, sizeof(msg));
- msg.msg_iov = &iov;
- msg.msg_iovlen = 1;
- msg.msg_control = &msg_control;
- msg.msg_controllen = sizeof(msg_control);
-
- do {
- retval = recvmsg(sockfd, &msg, 0);
- } while (retval < 0 && errno == EINTR);
- if (retval <= 0) {
- return retval;
- }
- /*
- * data is set to V9FS_FD_VALID, if ancillary data is sent. If this
- * request doesn't need ancillary data (fd) or an error occurred,
- * data is set to negative errno value.
- */
- if (data != V9FS_FD_VALID) {
- *status = data;
- return 0;
- }
- /*
- * File descriptor (fd) is sent in the ancillary data. Check if we
- * indeed received it. One of the reasons to fail to receive it is if
- * we exceeded the maximum number of file descriptors!
- */
- for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
- if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)) ||
- cmsg->cmsg_level != SOL_SOCKET ||
- cmsg->cmsg_type != SCM_RIGHTS) {
- continue;
- }
- fd = *((int *)CMSG_DATA(cmsg));
- *status = fd;
- return 0;
- }
- *status = -ENFILE; /* Ancillary data sent but not received */
- return 0;
-}
-
static ssize_t socket_read(int sockfd, void *buff, size_t size)
{
ssize_t retval, total = 0;
@@ -307,6 +252,7 @@ static int v9fs_request(V9fsProxy *proxy, int type,
V9fsString *name, *value;
V9fsString *path, *oldpath;
struct iovec *iovec = NULL, *reply = NULL;
+ int data = V9FS_FD_VALID;
qemu_mutex_lock(&proxy->mutex);
@@ -548,7 +494,7 @@ static int v9fs_request(V9fsProxy *proxy, int type,
* A file descriptor is returned as response for
* T_OPEN,T_CREATE on success
*/
- if (v9fs_receivefd(proxy->sockfd, &retval) < 0) {
+ if (qemu_recv_with_fd(proxy->sockfd, &retval, &data, sizeof(data)) < 0) {
goto close_error;
}
break;
--
1.7.7.6
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD
2014-01-23 8:27 [Qemu-devel] [PATCH 0/5 v2] Provide common methods for exchange FD Lei Li
` (4 preceding siblings ...)
2014-01-23 8:27 ` [Qemu-devel] [PATCH 5/5] virtio-9p-proxy: replace v9fs_receivefd with qemu_recv_with_fd Lei Li
@ 2014-01-23 18:55 ` Antonios Motakis
5 siblings, 0 replies; 7+ messages in thread
From: Antonios Motakis @ 2014-01-23 18:55 UTC (permalink / raw)
To: Lei Li; +Cc: Paolo Bonzini, mohan, qemu-devel qemu-devel, Nikolay Nikolaev
[-- Attachment #1: Type: text/plain, Size: 1995 bytes --]
Hello,
On Thu, Jan 23, 2014 at 9:27 AM, Lei Li <lilei@linux.vnet.ibm.com> wrote:
> This patch series tries to refactor the functions used for
> exchange of FD in current code, provide common methods
> for it.
>
> I just tested it through page flipping migration, and tap/
> bridge-helper a bit, but have some environment problem on
> proxy fs driver. So it'd be appreciated if someone could
> help on verifying whether it has impact on it. :)
>
> Please let me know if there is anything needs to be improved.
>
> Thanks
>
>
This looks really interesting. We are currently working on a patch series
that will also need to exchange file descriptors(see vhost_user_send_fds in
http://lists.gnu.org/archive/html/qemu-devel/2014-01/msg01444.html).
I wonder if you have taken into account the case of sending multiple file
descriptors in one go.
Antonios
>
> Changes since V1:
> -- Copy right and typo fixes pointed out by Eric.
> -- Don't cast 'char *' to 'int *' from Daniel.
> -- Get rid of local migration part.
>
> Lei Li (5):
> fd-exchange: provide common methods for exchange of fd
> qemu-bridge-helper: replace send_fd with qemu_send_with_fd
> net/tap: replace recv_fd with qemu_recv_with_fd
> virtfs-proxy-helper: replace send_fd with qemu_send_with_fd
> virtio-9p-proxy: replace v9fs_receivefd with qemu_recv_with_fd
>
> Makefile | 2 +-
> fsdev/virtfs-proxy-helper.c | 51 ++++-------------------
> hw/9pfs/virtio-9p-proxy.c | 60 +-------------------------
> hw/9pfs/virtio-9p-proxy.h | 5 --
> include/qemu/fd-exchange.h | 25 +++++++++++
> net/tap.c | 40 +----------------
> qemu-bridge-helper.c | 31 +------------
> util/Makefile.objs | 1 +
> util/qemu-fd-exchange.c | 97
> +++++++++++++++++++++++++++++++++++++++++++
> 10 files changed, 144 insertions(+), 220 deletions(-)
> create mode 100644 include/qemu/fd-exchange.h
> create mode 100644 util/qemu-fd-exchange.c
>
>
>
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