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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
committermarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
commit3562e78743202e43aec8727005182a2558117eca (patch)
tree8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /libxcb/src/xcb_conn.c
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Diffstat (limited to 'libxcb/src/xcb_conn.c')
-rw-r--r--libxcb/src/xcb_conn.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/libxcb/src/xcb_conn.c b/libxcb/src/xcb_conn.c
new file mode 100644
index 000000000..e7856c355
--- /dev/null
+++ b/libxcb/src/xcb_conn.c
@@ -0,0 +1,368 @@
+/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the names of the authors or their
+ * institutions shall not be used in advertising or otherwise to promote the
+ * sale, use or other dealings in this Software without prior written
+ * authorization from the authors.
+ */
+
+/* Connection management: the core of XCB. */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/select.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "xcb.h"
+#include "xcbint.h"
+
+typedef struct {
+ uint8_t status;
+ uint8_t pad0[5];
+ uint16_t length;
+} xcb_setup_generic_t;
+
+static const int error_connection = 1;
+
+static int set_fd_flags(const int fd)
+{
+ int flags = fcntl(fd, F_GETFL, 0);
+ if(flags == -1)
+ return 0;
+ flags |= O_NONBLOCK;
+ if(fcntl(fd, F_SETFL, flags) == -1)
+ return 0;
+ if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+ return 0;
+ return 1;
+}
+
+static int _xcb_xlib_init(_xcb_xlib *xlib)
+{
+ xlib->lock = 0;
+#ifndef NDEBUG
+ xlib->sloppy_lock = (getenv("LIBXCB_ALLOW_SLOPPY_LOCK") != 0);
+#endif
+ pthread_cond_init(&xlib->cond, 0);
+ return 1;
+}
+
+static void _xcb_xlib_destroy(_xcb_xlib *xlib)
+{
+ pthread_cond_destroy(&xlib->cond);
+}
+
+static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
+{
+ static const char pad[3];
+ xcb_setup_request_t out;
+ struct iovec parts[6];
+ int count = 0;
+ int endian = 0x01020304;
+ int ret;
+
+ memset(&out, 0, sizeof(out));
+
+ /* B = 0x42 = MSB first, l = 0x6c = LSB first */
+ if(htonl(endian) == endian)
+ out.byte_order = 0x42;
+ else
+ out.byte_order = 0x6c;
+ out.protocol_major_version = X_PROTOCOL;
+ out.protocol_minor_version = X_PROTOCOL_REVISION;
+ out.authorization_protocol_name_len = 0;
+ out.authorization_protocol_data_len = 0;
+ parts[count].iov_len = sizeof(xcb_setup_request_t);
+ parts[count++].iov_base = &out;
+ parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
+ parts[count++].iov_base = (char *) pad;
+
+ if(auth_info)
+ {
+ parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
+ parts[count++].iov_base = auth_info->name;
+ parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
+ parts[count++].iov_base = (char *) pad;
+ parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
+ parts[count++].iov_base = auth_info->data;
+ parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
+ parts[count++].iov_base = (char *) pad;
+ }
+ assert(count <= sizeof(parts) / sizeof(*parts));
+
+ _xcb_lock_io(c);
+ {
+ struct iovec *parts_ptr = parts;
+ ret = _xcb_out_send(c, &parts_ptr, &count);
+ }
+ _xcb_unlock_io(c);
+ return ret;
+}
+
+static int read_setup(xcb_connection_t *c)
+{
+ /* Read the server response */
+ c->setup = malloc(sizeof(xcb_setup_generic_t));
+ if(!c->setup)
+ return 0;
+
+ if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
+ return 0;
+
+ {
+ void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
+ if(!tmp)
+ return 0;
+ c->setup = tmp;
+ }
+
+ if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
+ return 0;
+
+ /* 0 = failed, 2 = authenticate, 1 = success */
+ switch(c->setup->status)
+ {
+ case 0: /* failed */
+ {
+ xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
+ write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
+ return 0;
+ }
+
+ case 2: /* authenticate */
+ {
+ xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
+ write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/* precondition: there must be something for us to write. */
+static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
+{
+ int n;
+ assert(!c->out.queue_len);
+ n = writev(c->fd, *vector, *count);
+ if(n < 0 && errno == EAGAIN)
+ return 1;
+ if(n <= 0)
+ {
+ _xcb_conn_shutdown(c);
+ return 0;
+ }
+
+ for(; *count; --*count, ++*vector)
+ {
+ int cur = (*vector)->iov_len;
+ if(cur > n)
+ cur = n;
+ (*vector)->iov_len -= cur;
+ (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
+ n -= cur;
+ if((*vector)->iov_len)
+ break;
+ }
+ if(!*count)
+ *vector = 0;
+ assert(n == 0);
+ return 1;
+}
+
+/* Public interface */
+
+const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
+{
+ if(c->has_error)
+ return 0;
+ /* doesn't need locking because it's never written to. */
+ return c->setup;
+}
+
+int xcb_get_file_descriptor(xcb_connection_t *c)
+{
+ if(c->has_error)
+ return -1;
+ /* doesn't need locking because it's never written to. */
+ return c->fd;
+}
+
+int xcb_connection_has_error(xcb_connection_t *c)
+{
+ /* doesn't need locking because it's read and written atomically. */
+ return c->has_error;
+}
+
+xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
+{
+ xcb_connection_t* c;
+
+ c = calloc(1, sizeof(xcb_connection_t));
+ if(!c)
+ return (xcb_connection_t *) &error_connection;
+
+ c->fd = fd;
+
+ if(!(
+ set_fd_flags(fd) &&
+ pthread_mutex_init(&c->iolock, 0) == 0 &&
+ _xcb_xlib_init(&c->xlib) &&
+ _xcb_in_init(&c->in) &&
+ _xcb_out_init(&c->out) &&
+ write_setup(c, auth_info) &&
+ read_setup(c) &&
+ _xcb_ext_init(c) &&
+ _xcb_xid_init(c)
+ ))
+ {
+ xcb_disconnect(c);
+ return (xcb_connection_t *) &error_connection;
+ }
+
+ return c;
+}
+
+void xcb_disconnect(xcb_connection_t *c)
+{
+ if(c->has_error)
+ return;
+
+ free(c->setup);
+ close(c->fd);
+
+ pthread_mutex_destroy(&c->iolock);
+ _xcb_xlib_destroy(&c->xlib);
+ _xcb_in_destroy(&c->in);
+ _xcb_out_destroy(&c->out);
+
+ _xcb_ext_destroy(c);
+ _xcb_xid_destroy(c);
+
+ free(c);
+}
+
+/* Private interface */
+
+void _xcb_conn_shutdown(xcb_connection_t *c)
+{
+ c->has_error = 1;
+}
+
+void _xcb_lock_io(xcb_connection_t *c)
+{
+ pthread_mutex_lock(&c->iolock);
+ while(c->xlib.lock)
+ {
+ if(pthread_equal(c->xlib.thread, pthread_self()))
+ break;
+ pthread_cond_wait(&c->xlib.cond, &c->iolock);
+ }
+}
+
+void _xcb_unlock_io(xcb_connection_t *c)
+{
+ pthread_mutex_unlock(&c->iolock);
+}
+
+void _xcb_wait_io(xcb_connection_t *c, pthread_cond_t *cond)
+{
+ int xlib_locked = c->xlib.lock;
+ if(xlib_locked)
+ {
+ c->xlib.lock = 0;
+ pthread_cond_broadcast(&c->xlib.cond);
+ }
+ pthread_cond_wait(cond, &c->iolock);
+ if(xlib_locked)
+ {
+ while(c->xlib.lock)
+ pthread_cond_wait(&c->xlib.cond, &c->iolock);
+ c->xlib.lock = 1;
+ c->xlib.thread = pthread_self();
+ }
+}
+
+int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
+{
+ int ret, xlib_locked;
+ fd_set rfds, wfds;
+
+ /* If the thing I should be doing is already being done, wait for it. */
+ if(count ? c->out.writing : c->in.reading)
+ {
+ _xcb_wait_io(c, cond);
+ return 1;
+ }
+
+ FD_ZERO(&rfds);
+ FD_SET(c->fd, &rfds);
+ ++c->in.reading;
+
+ FD_ZERO(&wfds);
+ if(count)
+ {
+ FD_SET(c->fd, &wfds);
+ ++c->out.writing;
+ }
+
+ xlib_locked = c->xlib.lock;
+ if(xlib_locked)
+ {
+ c->xlib.lock = 0;
+ pthread_cond_broadcast(&c->xlib.cond);
+ }
+ _xcb_unlock_io(c);
+ do {
+ ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
+ } while (ret == -1 && errno == EINTR);
+ if (ret < 0)
+ {
+ _xcb_conn_shutdown(c);
+ ret = 0;
+ }
+ _xcb_lock_io(c);
+ if(xlib_locked)
+ {
+ c->xlib.lock = 1;
+ c->xlib.thread = pthread_self();
+ }
+
+ if(ret)
+ {
+ if(FD_ISSET(c->fd, &rfds))
+ ret = ret && _xcb_in_read(c);
+
+ if(FD_ISSET(c->fd, &wfds))
+ ret = ret && write_vec(c, vector, count);
+ }
+
+ if(count)
+ --c->out.writing;
+ --c->in.reading;
+
+ return ret;
+}