[Xcb] [PATCH 4/8] Add xcb_send_fd API
Keith Packard
keithp at keithp.com
Thu Nov 7 04:45:41 CET 2013
This uses sendmsg to transmit file descriptors from the application to
the X server
Signed-off-by: Keith Packard <keithp at keithp.com>
---
configure.ac | 14 ++++++++++++++
src/c_client.py | 4 ++++
src/xcb_auth.c | 11 ++++++-----
src/xcb_conn.c | 39 +++++++++++++++++++++++++++++++++------
src/xcb_ext.c | 3 +++
src/xcb_in.c | 9 +++++----
src/xcb_list.c | 3 +++
src/xcb_out.c | 19 +++++++++++++++++++
src/xcb_xid.c | 4 ++++
src/xcbext.h | 2 ++
src/xcbint.h | 13 +++++++++++++
11 files changed, 106 insertions(+), 15 deletions(-)
diff --git a/configure.ac b/configure.ac
index 4a30584..47c31a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -81,6 +81,19 @@ AC_HEADER_STDC
AC_SEARCH_LIBS(getaddrinfo, socket)
AC_SEARCH_LIBS(connect, socket)
+have_sendmsg="no"
+case $host_os in
+linux*)
+ AC_SEARCH_LIBS(sendmsg, socket, [have_sendmsg="yes"], [have_sendmsg="no"])
+ ;;
+esac
+
+case x$have_sendmsg in
+xyes)
+ AC_DEFINE([HAVE_SENDMSG],1,[Define if your platform supports sendmsg])
+ ;;
+esac
+
have_win32="no"
lt_enable_auto_import=""
case $host_os in
@@ -250,6 +263,7 @@ echo " Package: ${PACKAGE_NAME} ${PACKAGE_VERSION}"
echo ""
echo " Configuration"
echo " XDM support.........: ${have_xdmcp}"
+echo " sendmsg fd passing..: ${have_sendmsg}"
echo " Build unit tests....: ${HAVE_CHECK}"
echo " with html results.: ${HTML_CHECK_RESULT}"
echo " XCB buffer size.....: ${xcb_queue_buffer_size}"
diff --git a/src/c_client.py b/src/c_client.py
index a6f8edd..cc26f72 100644
--- a/src/c_client.py
+++ b/src/c_client.py
@@ -2149,6 +2149,10 @@ def _c_request_helper(self, name, cookie_type, void, regular, aux=False):
# no padding necessary - _serialize() keeps track of padding automatically
_c(' ')
+ for field in param_fields:
+ if field.isfd:
+ _c(' xcb_send_fd(c, %s);', field.c_field_name)
+
_c(' xcb_ret.sequence = xcb_send_request(c, %s, xcb_parts + 2, &xcb_req);', func_flags)
# free dyn. all. data, if any
diff --git a/src/xcb_auth.c b/src/xcb_auth.c
index a5b730c..2f7c93e 100644
--- a/src/xcb_auth.c
+++ b/src/xcb_auth.c
@@ -34,6 +34,12 @@
#include <sys/param.h>
#include <unistd.h>
#include <stdlib.h>
+#ifndef _WIN32
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <sys/un.h>
+#endif
#ifdef __INTERIX
/* _don't_ ask. interix has INADDR_LOOPBACK in here. */
@@ -47,11 +53,6 @@
#include <X11/Xwindows.h>
#endif
#include "xcb_windefs.h"
-#else
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <sys/un.h>
#endif /* _WIN32 */
#include "xcb.h"
diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index 7dd25d3..0237d16 100644
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -38,6 +38,11 @@
#include <errno.h>
#include <limits.h>
+#ifndef _WIN32
+#include <sys/socket.h>
+#include <netinet/in.h>
+#endif /* !_WIN32 */
+
#include "xcb.h"
#include "xcbint.h"
#if USE_POLL
@@ -48,9 +53,6 @@
#ifdef _WIN32
#include "xcb_windefs.h"
-#else
-#include <sys/socket.h>
-#include <netinet/in.h>
#endif /* _WIN32 */
/* SHUT_RDWR is fairly recent and is not available on all platforms */
@@ -214,9 +216,34 @@ static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
if (n > IOV_MAX)
n = IOV_MAX;
- n = writev(c->fd, *vector, n);
- if(n < 0 && errno == EAGAIN)
- return 1;
+#if HAVE_SENDMSG
+ if (c->out.out_fd.nfd) {
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = *vector,
+ .msg_iovlen = n,
+ .msg_control = &c->out.out_fd,
+ .msg_controllen = sizeof (struct cmsghdr) + c->out.out_fd.nfd * sizeof (int),
+ };
+ int i;
+ c->out.out_fd.cmsghdr.cmsg_len = msg.msg_controllen;
+ c->out.out_fd.cmsghdr.cmsg_level = SOL_SOCKET;
+ c->out.out_fd.cmsghdr.cmsg_type = SCM_RIGHTS;
+ n = sendmsg(c->fd, &msg, 0);
+ if(n < 0 && errno == EAGAIN)
+ return 1;
+ for (i = 0; i < c->out.out_fd.nfd; i++)
+ close(c->out.out_fd.fd[i]);
+ c->out.out_fd.nfd = 0;
+ } else
+#endif
+ {
+ n = writev(c->fd, *vector, n);
+ if(n < 0 && errno == EAGAIN)
+ return 1;
+ }
+
#endif /* _WIN32 */
if(n <= 0)
diff --git a/src/xcb_ext.c b/src/xcb_ext.c
index 831f283..1ff2b05 100644
--- a/src/xcb_ext.c
+++ b/src/xcb_ext.c
@@ -31,6 +31,9 @@
#include <stdlib.h>
#include <string.h>
+#ifndef _WIN32
+#include <sys/socket.h>
+#endif
#include "xcb.h"
#include "xcbext.h"
diff --git a/src/xcb_in.c b/src/xcb_in.c
index 8a7af92..ac4d284 100644
--- a/src/xcb_in.c
+++ b/src/xcb_in.c
@@ -36,16 +36,17 @@
#include <stdio.h>
#include <errno.h>
+#ifndef _WIN32
+#include <sys/select.h>
+#include <sys/socket.h>
+#endif
+
#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
#if USE_POLL
#include <poll.h>
#endif
-#ifndef _WIN32
-#include <sys/select.h>
-#include <sys/socket.h>
-#endif
#ifdef _WIN32
#include "xcb_windefs.h"
diff --git a/src/xcb_list.c b/src/xcb_list.c
index 129540b..075c535 100644
--- a/src/xcb_list.c
+++ b/src/xcb_list.c
@@ -30,6 +30,9 @@
#endif
#include <stdlib.h>
+#ifndef _WIN32
+#include <sys/socket.h>
+#endif
#include "xcb.h"
#include "xcbint.h"
diff --git a/src/xcb_out.c b/src/xcb_out.c
index 429fa99..ed8458c 100644
--- a/src/xcb_out.c
+++ b/src/xcb_out.c
@@ -33,6 +33,9 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
+#ifndef _WIN32
+#include <sys/socket.h>
+#endif
#include "xcb.h"
#include "xcbext.h"
@@ -263,6 +266,22 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
return request;
}
+void
+xcb_send_fd(xcb_connection_t *c, int fd)
+{
+#if HAVE_SENDMSG
+ pthread_mutex_lock(&c->iolock);
+ while (c->out.out_fd.nfd == XCB_MAX_PASS_FD) {
+ _xcb_out_flush_to(c, c->out.request);
+ if (c->has_error)
+ break;
+ }
+ if (!c->has_error)
+ c->out.out_fd.fd[c->out.out_fd.nfd++] = fd;
+ pthread_mutex_unlock(&c->iolock);
+#endif
+}
+
int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), void *closure, int flags, uint64_t *sent)
{
int ret;
diff --git a/src/xcb_xid.c b/src/xcb_xid.c
index 79a9a27..3c5682c 100644
--- a/src/xcb_xid.c
+++ b/src/xcb_xid.c
@@ -31,6 +31,10 @@
#include <assert.h>
#include <stdlib.h>
+#ifndef _WIN32
+#include <sys/socket.h>
+#endif
+
#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
diff --git a/src/xcbext.h b/src/xcbext.h
index 4e1f2f7..44030c3 100644
--- a/src/xcbext.h
+++ b/src/xcbext.h
@@ -59,6 +59,8 @@ enum xcb_send_request_flags_t {
unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vector, const xcb_protocol_request_t *request);
+void xcb_send_fd(xcb_connection_t *c, int fd);
+
/* xcb_take_socket allows external code to ask XCB for permission to
* take over the write side of the socket and send raw data with
* xcb_writev. xcb_take_socket provides the sequence number of the last
diff --git a/src/xcbint.h b/src/xcbint.h
index 7f9ab28..b2dfed3 100644
--- a/src/xcbint.h
+++ b/src/xcbint.h
@@ -81,6 +81,16 @@ void *_xcb_map_remove(_xcb_map *q, unsigned int key);
typedef void (*xcb_return_socket_func_t)(void *closure);
+#if HAVE_SENDMSG
+#define XCB_MAX_PASS_FD 16
+
+typedef struct _xcb_fd {
+ struct cmsghdr cmsghdr;
+ int fd[XCB_MAX_PASS_FD];
+ int nfd;
+} _xcb_fd;
+#endif
+
typedef struct _xcb_out {
pthread_cond_t cond;
int writing;
@@ -101,6 +111,9 @@ typedef struct _xcb_out {
xcb_big_requests_enable_cookie_t cookie;
uint32_t value;
} maximum_request_length;
+#if HAVE_SENDMSG
+ _xcb_fd out_fd;
+#endif
} _xcb_out;
int _xcb_out_init(_xcb_out *out);
--
1.8.4.2
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