aboutsummaryrefslogtreecommitdiff
path: root/libxcb/src/xcb_in.c
diff options
context:
space:
mode:
Diffstat (limited to 'libxcb/src/xcb_in.c')
-rw-r--r--libxcb/src/xcb_in.c1406
1 files changed, 706 insertions, 700 deletions
diff --git a/libxcb/src/xcb_in.c b/libxcb/src/xcb_in.c
index 4acc3a27d..e0e7a7cac 100644
--- a/libxcb/src/xcb_in.c
+++ b/libxcb/src/xcb_in.c
@@ -1,700 +1,706 @@
-/* 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.
- */
-
-/* Stuff that reads stuff from the server. */
-
-#include <assert.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <errno.h>
-
-#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"
-#endif /* _WIN32 */
-
-#define XCB_ERROR 0
-#define XCB_REPLY 1
-#define XCB_XGE_EVENT 35
-
-/* required for compiling for Win32 using MinGW */
-#ifndef MSG_WAITALL
-#define MSG_WAITALL 0
-#endif
-
-struct event_list {
- xcb_generic_event_t *event;
- struct event_list *next;
-};
-
-struct reply_list {
- void *reply;
- struct reply_list *next;
-};
-
-typedef struct pending_reply {
- uint64_t first_request;
- uint64_t last_request;
- enum workarounds workaround;
- int flags;
- struct pending_reply *next;
-} pending_reply;
-
-typedef struct reader_list {
- uint64_t request;
- pthread_cond_t *data;
- struct reader_list *next;
-} reader_list;
-
-static void remove_finished_readers(reader_list **prev_reader, uint64_t completed)
-{
- while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, completed))
- {
- /* If you don't have what you're looking for now, you never
- * will. Wake up and leave me alone. */
- pthread_cond_signal((*prev_reader)->data);
- *prev_reader = (*prev_reader)->next;
- }
-}
-
-static int read_packet(xcb_connection_t *c)
-{
- xcb_generic_reply_t genrep;
- int length = 32;
- int eventlength = 0; /* length after first 32 bytes for GenericEvents */
- void *buf;
- pending_reply *pend = 0;
- struct event_list *event;
-
- /* Wait for there to be enough data for us to read a whole packet */
- if(c->in.queue_len < length)
- return 0;
-
- /* Get the response type, length, and sequence number. */
- memcpy(&genrep, c->in.queue, sizeof(genrep));
-
- /* Compute 32-bit sequence number of this packet. */
- if((genrep.response_type & 0x7f) != XCB_KEYMAP_NOTIFY)
- {
- uint64_t lastread = c->in.request_read;
- c->in.request_read = (lastread & UINT64_C(0xffffffffffff0000)) | genrep.sequence;
- if(XCB_SEQUENCE_COMPARE(c->in.request_read, <, lastread))
- c->in.request_read += 0x10000;
- if(XCB_SEQUENCE_COMPARE(c->in.request_read, >, c->in.request_expected))
- c->in.request_expected = c->in.request_read;
-
- if(c->in.request_read != lastread)
- {
- if(c->in.current_reply)
- {
- _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
- c->in.current_reply = 0;
- c->in.current_reply_tail = &c->in.current_reply;
- }
- c->in.request_completed = c->in.request_read - 1;
- }
-
- while(c->in.pending_replies &&
- c->in.pending_replies->workaround != WORKAROUND_EXTERNAL_SOCKET_OWNER &&
- XCB_SEQUENCE_COMPARE (c->in.pending_replies->last_request, <=, c->in.request_completed))
- {
- pending_reply *oldpend = c->in.pending_replies;
- c->in.pending_replies = oldpend->next;
- if(!oldpend->next)
- c->in.pending_replies_tail = &c->in.pending_replies;
- free(oldpend);
- }
-
- if(genrep.response_type == XCB_ERROR)
- c->in.request_completed = c->in.request_read;
-
- remove_finished_readers(&c->in.readers, c->in.request_completed);
- }
-
- if(genrep.response_type == XCB_ERROR || genrep.response_type == XCB_REPLY)
- {
- pend = c->in.pending_replies;
- if(pend &&
- !(XCB_SEQUENCE_COMPARE(pend->first_request, <=, c->in.request_read) &&
- (pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER ||
- XCB_SEQUENCE_COMPARE(c->in.request_read, <=, pend->last_request))))
- pend = 0;
- }
-
- /* For reply packets, check that the entire packet is available. */
- if(genrep.response_type == XCB_REPLY)
- {
- if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
- {
- uint32_t *p = (uint32_t *) c->in.queue;
- genrep.length = p[2] * p[3] * 2;
- }
- length += genrep.length * 4;
- }
-
- /* XGE events may have sizes > 32 */
- if ((genrep.response_type & 0x7f) == XCB_XGE_EVENT)
- eventlength = genrep.length * 4;
-
- buf = malloc(length + eventlength +
- (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t)));
- if(!buf)
- {
- _xcb_conn_shutdown(c);
- return 0;
- }
-
- if(_xcb_in_read_block(c, buf, length) <= 0)
- {
- free(buf);
- return 0;
- }
-
- /* pull in XGE event data if available, append after event struct */
- if (eventlength)
- {
- if(_xcb_in_read_block(c, &((xcb_generic_event_t*)buf)[1], eventlength) <= 0)
- {
- free(buf);
- return 0;
- }
- }
-
- if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
- {
- free(buf);
- return 1;
- }
-
- if(genrep.response_type != XCB_REPLY)
- ((xcb_generic_event_t *) buf)->full_sequence = c->in.request_read;
-
- /* reply, or checked error */
- if( genrep.response_type == XCB_REPLY ||
- (genrep.response_type == XCB_ERROR && pend && (pend->flags & XCB_REQUEST_CHECKED)))
- {
- struct reply_list *cur = malloc(sizeof(struct reply_list));
- if(!cur)
- {
- _xcb_conn_shutdown(c);
- free(buf);
- return 0;
- }
- cur->reply = buf;
- cur->next = 0;
- *c->in.current_reply_tail = cur;
- c->in.current_reply_tail = &cur->next;
- if(c->in.readers && c->in.readers->request == c->in.request_read)
- pthread_cond_signal(c->in.readers->data);
- return 1;
- }
-
- /* event, or unchecked error */
- event = malloc(sizeof(struct event_list));
- if(!event)
- {
- _xcb_conn_shutdown(c);
- free(buf);
- return 0;
- }
- event->event = buf;
- event->next = 0;
- *c->in.events_tail = event;
- c->in.events_tail = &event->next;
- pthread_cond_signal(&c->in.event_cond);
- return 1; /* I have something for you... */
-}
-
-static xcb_generic_event_t *get_event(xcb_connection_t *c)
-{
- struct event_list *cur = c->in.events;
- xcb_generic_event_t *ret;
- if(!c->in.events)
- return 0;
- ret = cur->event;
- c->in.events = cur->next;
- if(!cur->next)
- c->in.events_tail = &c->in.events;
- free(cur);
- return ret;
-}
-
-static void free_reply_list(struct reply_list *head)
-{
- while(head)
- {
- struct reply_list *cur = head;
- head = cur->next;
- free(cur->reply);
- free(cur);
- }
-}
-
-static int read_block(const int fd, void *buf, const ssize_t len)
-{
- int done = 0;
- while(done < len)
- {
- int ret = recv(fd, ((char *) buf) + done, len - done,MSG_WAITALL);
- if(ret > 0)
- done += ret;
-#ifndef _WIN32
- if(ret < 0 && errno == EAGAIN)
-#else
- if(ret == SOCKET_ERROR && WSAGetLastError() == WSAEWOULDBLOCK)
-#endif /* !_Win32 */
- {
-#if USE_POLL
- struct pollfd pfd;
- pfd.fd = fd;
- pfd.events = POLLIN;
- pfd.revents = 0;
- do {
- ret = poll(&pfd, 1, -1);
- } while (ret == -1 && errno == EINTR);
-#else
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
-
- /* Initializing errno here makes sure that for Win32 this loop will execute only once */
- errno = 0;
- do {
- ret = select(fd + 1, &fds, 0, 0, 0);
- } while (ret == -1 && errno == EINTR);
-#endif /* USE_POLL */
- }
- if(ret <= 0)
- return ret;
- }
- return len;
-}
-
-static int poll_for_reply(xcb_connection_t *c, uint64_t request, void **reply, xcb_generic_error_t **error)
-{
- struct reply_list *head;
-
- /* If an error occurred when issuing the request, fail immediately. */
- if(!request)
- head = 0;
- /* We've read requests past the one we want, so if it has replies we have
- * them all and they're in the replies map. */
- else if(XCB_SEQUENCE_COMPARE(request, <, c->in.request_read))
- {
- head = _xcb_map_remove(c->in.replies, request);
- if(head && head->next)
- _xcb_map_put(c->in.replies, request, head->next);
- }
- /* We're currently processing the responses to the request we want, and we
- * have a reply ready to return. So just return it without blocking. */
- else if(request == c->in.request_read && c->in.current_reply)
- {
- head = c->in.current_reply;
- c->in.current_reply = head->next;
- if(!head->next)
- c->in.current_reply_tail = &c->in.current_reply;
- }
- /* We know this request can't have any more replies, and we've already
- * established it doesn't have a reply now. Don't bother blocking. */
- else if(request == c->in.request_completed)
- head = 0;
- /* We may have more replies on the way for this request: block until we're
- * sure. */
- else
- return 0;
-
- if(error)
- *error = 0;
- *reply = 0;
-
- if(head)
- {
- if(((xcb_generic_reply_t *) head->reply)->response_type == XCB_ERROR)
- {
- if(error)
- *error = head->reply;
- else
- free(head->reply);
- }
- else
- *reply = head->reply;
-
- free(head);
- }
-
- return 1;
-}
-
-static void insert_reader(reader_list **prev_reader, reader_list *reader, uint64_t request, pthread_cond_t *cond)
-{
- while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, request))
- prev_reader = &(*prev_reader)->next;
- reader->request = request;
- reader->data = cond;
- reader->next = *prev_reader;
- *prev_reader = reader;
-}
-
-static void remove_reader(reader_list **prev_reader, reader_list *reader)
-{
- while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, reader->request))
- if(*prev_reader == reader)
- {
- *prev_reader = (*prev_reader)->next;
- break;
- }
-}
-
-static void *wait_for_reply(xcb_connection_t *c, uint64_t request, xcb_generic_error_t **e)
-{
- void *ret = 0;
-
- /* If this request has not been written yet, write it. */
- if(c->out.return_socket || _xcb_out_flush_to(c, request))
- {
- pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
- reader_list reader;
-
- insert_reader(&c->in.readers, &reader, request, &cond);
-
- while(!poll_for_reply(c, request, &ret, e))
- if(!_xcb_conn_wait(c, &cond, 0, 0))
- break;
-
- remove_reader(&c->in.readers, &reader);
- pthread_cond_destroy(&cond);
- }
-
- _xcb_in_wake_up_next_reader(c);
- return ret;
-}
-
-static uint64_t widen(xcb_connection_t *c, unsigned int request)
-{
- uint64_t widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
- if(widened_request > c->out.request)
- widened_request -= UINT64_C(1) << 32;
- return widened_request;
-}
-
-/* Public interface */
-
-void *xcb_wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
-{
- void *ret;
- if(e)
- *e = 0;
- if(c->has_error)
- return 0;
-
- pthread_mutex_lock(&c->iolock);
- ret = wait_for_reply(c, widen(c, request), e);
- pthread_mutex_unlock(&c->iolock);
- return ret;
-}
-
-static void insert_pending_discard(xcb_connection_t *c, pending_reply **prev_next, uint64_t seq)
-{
- pending_reply *pend;
- pend = malloc(sizeof(*pend));
- if(!pend)
- {
- _xcb_conn_shutdown(c);
- return;
- }
-
- pend->first_request = seq;
- pend->last_request = seq;
- pend->workaround = 0;
- pend->flags = XCB_REQUEST_DISCARD_REPLY;
- pend->next = *prev_next;
- *prev_next = pend;
-
- if(!pend->next)
- c->in.pending_replies_tail = &pend->next;
-}
-
-static void discard_reply(xcb_connection_t *c, uint64_t request)
-{
- void *reply;
- pending_reply **prev_pend;
-
- /* Free any replies or errors that we've already read. Stop if
- * xcb_wait_for_reply would block or we've run out of replies. */
- while(poll_for_reply(c, request, &reply, 0) && reply)
- free(reply);
-
- /* If we've proven there are no more responses coming, we're done. */
- if(XCB_SEQUENCE_COMPARE(request, <=, c->in.request_completed))
- return;
-
- /* Walk the list of pending requests. Mark the first match for deletion. */
- for(prev_pend = &c->in.pending_replies; *prev_pend; prev_pend = &(*prev_pend)->next)
- {
- if(XCB_SEQUENCE_COMPARE((*prev_pend)->first_request, >, request))
- break;
-
- if((*prev_pend)->first_request == request)
- {
- /* Pending reply found. Mark for discard: */
- (*prev_pend)->flags |= XCB_REQUEST_DISCARD_REPLY;
- return;
- }
- }
-
- /* Pending reply not found (likely due to _unchecked request). Create one: */
- insert_pending_discard(c, prev_pend, request);
-}
-
-void xcb_discard_reply(xcb_connection_t *c, unsigned int sequence)
-{
- if(c->has_error)
- return;
-
- /* If an error occurred when issuing the request, fail immediately. */
- if(!sequence)
- return;
-
- pthread_mutex_lock(&c->iolock);
- discard_reply(c, widen(c, sequence));
- pthread_mutex_unlock(&c->iolock);
-}
-
-int xcb_poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
-{
- int ret;
- if(c->has_error)
- {
- *reply = 0;
- if(error)
- *error = 0;
- return 1; /* would not block */
- }
- assert(reply != 0);
- pthread_mutex_lock(&c->iolock);
- ret = poll_for_reply(c, widen(c, request), reply, error);
- pthread_mutex_unlock(&c->iolock);
- return ret;
-}
-
-xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c)
-{
- xcb_generic_event_t *ret;
- if(c->has_error)
- return 0;
- pthread_mutex_lock(&c->iolock);
- /* get_event returns 0 on empty list. */
- while(!(ret = get_event(c)))
- if(!_xcb_conn_wait(c, &c->in.event_cond, 0, 0))
- break;
-
- _xcb_in_wake_up_next_reader(c);
- pthread_mutex_unlock(&c->iolock);
- return ret;
-}
-
-static xcb_generic_event_t *poll_for_next_event(xcb_connection_t *c, int queued)
-{
- xcb_generic_event_t *ret = 0;
- if(!c->has_error)
- {
- pthread_mutex_lock(&c->iolock);
- /* FIXME: follow X meets Z architecture changes. */
- ret = get_event(c);
- if(!ret && !queued && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
- ret = get_event(c);
- pthread_mutex_unlock(&c->iolock);
- }
- return ret;
-}
-
-xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
-{
- return poll_for_next_event(c, 0);
-}
-
-xcb_generic_event_t *xcb_poll_for_queued_event(xcb_connection_t *c)
-{
- return poll_for_next_event(c, 1);
-}
-
-xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie)
-{
- uint64_t request;
- xcb_generic_error_t *ret = 0;
- void *reply;
- if(c->has_error)
- return 0;
- pthread_mutex_lock(&c->iolock);
- request = widen(c, cookie.sequence);
- if(XCB_SEQUENCE_COMPARE(request, >=, c->in.request_expected)
- && XCB_SEQUENCE_COMPARE(request, >, c->in.request_completed))
- {
- _xcb_out_send_sync(c);
- _xcb_out_flush_to(c, c->out.request);
- }
- reply = wait_for_reply(c, request, &ret);
- assert(!reply);
- pthread_mutex_unlock(&c->iolock);
- return ret;
-}
-
-/* Private interface */
-
-int _xcb_in_init(_xcb_in *in)
-{
- if(pthread_cond_init(&in->event_cond, 0))
- return 0;
- in->reading = 0;
-
- in->queue_len = 0;
-
- in->request_read = 0;
- in->request_completed = 0;
-
- in->replies = _xcb_map_new();
- if(!in->replies)
- return 0;
-
- in->current_reply_tail = &in->current_reply;
- in->events_tail = &in->events;
- in->pending_replies_tail = &in->pending_replies;
-
- return 1;
-}
-
-void _xcb_in_destroy(_xcb_in *in)
-{
- pthread_cond_destroy(&in->event_cond);
- free_reply_list(in->current_reply);
- _xcb_map_delete(in->replies, (void (*)(void *)) free_reply_list);
- while(in->events)
- {
- struct event_list *e = in->events;
- in->events = e->next;
- free(e->event);
- free(e);
- }
- while(in->pending_replies)
- {
- pending_reply *pend = in->pending_replies;
- in->pending_replies = pend->next;
- free(pend);
- }
-}
-
-void _xcb_in_wake_up_next_reader(xcb_connection_t *c)
-{
- int pthreadret;
- if(c->in.readers)
- pthreadret = pthread_cond_signal(c->in.readers->data);
- else
- pthreadret = pthread_cond_signal(&c->in.event_cond);
- assert(pthreadret == 0);
-}
-
-int _xcb_in_expect_reply(xcb_connection_t *c, uint64_t request, enum workarounds workaround, int flags)
-{
- pending_reply *pend = malloc(sizeof(pending_reply));
- assert(workaround != WORKAROUND_NONE || flags != 0);
- if(!pend)
- {
- _xcb_conn_shutdown(c);
- return 0;
- }
- pend->first_request = pend->last_request = request;
- pend->workaround = workaround;
- pend->flags = flags;
- pend->next = 0;
- *c->in.pending_replies_tail = pend;
- c->in.pending_replies_tail = &pend->next;
- return 1;
-}
-
-void _xcb_in_replies_done(xcb_connection_t *c)
-{
- struct pending_reply *pend;
- if (c->in.pending_replies_tail != &c->in.pending_replies)
- {
- pend = container_of(c->in.pending_replies_tail, struct pending_reply, next);
- if(pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER)
- {
- pend->last_request = c->out.request;
- pend->workaround = WORKAROUND_NONE;
- }
- }
-}
-
-int _xcb_in_read(xcb_connection_t *c)
-{
- int n = recv(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len,MSG_WAITALL);
- if(n > 0)
- c->in.queue_len += n;
- while(read_packet(c))
- /* empty */;
-#ifndef _WIN32
- if((n > 0) || (n < 0 && errno == EAGAIN))
-#else
- if((n > 0) || (n < 0 && WSAGetLastError() == WSAEWOULDBLOCK))
-#endif /* !_WIN32 */
- return 1;
- _xcb_conn_shutdown(c);
- return 0;
-}
-
-int _xcb_in_read_block(xcb_connection_t *c, void *buf, int len)
-{
- int done = c->in.queue_len;
- if(len < done)
- done = len;
-
- memcpy(buf, c->in.queue, done);
- c->in.queue_len -= done;
- memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
-
- if(len > done)
- {
- int ret = read_block(c->fd, (char *) buf + done, len - done);
- if(ret <= 0)
- {
- _xcb_conn_shutdown(c);
- return ret;
- }
- }
-
- return len;
-}
+/* 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.
+ */
+
+/* Stuff that reads stuff from the server. */
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+
+#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"
+#endif /* _WIN32 */
+
+#define XCB_ERROR 0
+#define XCB_REPLY 1
+#define XCB_XGE_EVENT 35
+
+#ifdef _MSC_VER
+#ifdef MSG_WAITALL
+#undef MSG_WAITALL
+#endif
+#endif
+
+/* required for compiling for Win32 using MinGW */
+#ifndef MSG_WAITALL
+#define MSG_WAITALL 0
+#endif
+
+struct event_list {
+ xcb_generic_event_t *event;
+ struct event_list *next;
+};
+
+struct reply_list {
+ void *reply;
+ struct reply_list *next;
+};
+
+typedef struct pending_reply {
+ uint64_t first_request;
+ uint64_t last_request;
+ enum workarounds workaround;
+ int flags;
+ struct pending_reply *next;
+} pending_reply;
+
+typedef struct reader_list {
+ uint64_t request;
+ pthread_cond_t *data;
+ struct reader_list *next;
+} reader_list;
+
+static void remove_finished_readers(reader_list **prev_reader, uint64_t completed)
+{
+ while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, completed))
+ {
+ /* If you don't have what you're looking for now, you never
+ * will. Wake up and leave me alone. */
+ pthread_cond_signal((*prev_reader)->data);
+ *prev_reader = (*prev_reader)->next;
+ }
+}
+
+static int read_packet(xcb_connection_t *c)
+{
+ xcb_generic_reply_t genrep;
+ int length = 32;
+ int eventlength = 0; /* length after first 32 bytes for GenericEvents */
+ void *buf;
+ pending_reply *pend = 0;
+ struct event_list *event;
+
+ /* Wait for there to be enough data for us to read a whole packet */
+ if(c->in.queue_len < length)
+ return 0;
+
+ /* Get the response type, length, and sequence number. */
+ memcpy(&genrep, c->in.queue, sizeof(genrep));
+
+ /* Compute 32-bit sequence number of this packet. */
+ if((genrep.response_type & 0x7f) != XCB_KEYMAP_NOTIFY)
+ {
+ uint64_t lastread = c->in.request_read;
+ c->in.request_read = (lastread & UINT64_C(0xffffffffffff0000)) | genrep.sequence;
+ if(XCB_SEQUENCE_COMPARE(c->in.request_read, <, lastread))
+ c->in.request_read += 0x10000;
+ if(XCB_SEQUENCE_COMPARE(c->in.request_read, >, c->in.request_expected))
+ c->in.request_expected = c->in.request_read;
+
+ if(c->in.request_read != lastread)
+ {
+ if(c->in.current_reply)
+ {
+ _xcb_map_put(c->in.replies, lastread, c->in.current_reply);
+ c->in.current_reply = 0;
+ c->in.current_reply_tail = &c->in.current_reply;
+ }
+ c->in.request_completed = c->in.request_read - 1;
+ }
+
+ while(c->in.pending_replies &&
+ c->in.pending_replies->workaround != WORKAROUND_EXTERNAL_SOCKET_OWNER &&
+ XCB_SEQUENCE_COMPARE (c->in.pending_replies->last_request, <=, c->in.request_completed))
+ {
+ pending_reply *oldpend = c->in.pending_replies;
+ c->in.pending_replies = oldpend->next;
+ if(!oldpend->next)
+ c->in.pending_replies_tail = &c->in.pending_replies;
+ free(oldpend);
+ }
+
+ if(genrep.response_type == XCB_ERROR)
+ c->in.request_completed = c->in.request_read;
+
+ remove_finished_readers(&c->in.readers, c->in.request_completed);
+ }
+
+ if(genrep.response_type == XCB_ERROR || genrep.response_type == XCB_REPLY)
+ {
+ pend = c->in.pending_replies;
+ if(pend &&
+ !(XCB_SEQUENCE_COMPARE(pend->first_request, <=, c->in.request_read) &&
+ (pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER ||
+ XCB_SEQUENCE_COMPARE(c->in.request_read, <=, pend->last_request))))
+ pend = 0;
+ }
+
+ /* For reply packets, check that the entire packet is available. */
+ if(genrep.response_type == XCB_REPLY)
+ {
+ if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
+ {
+ uint32_t *p = (uint32_t *) c->in.queue;
+ genrep.length = p[2] * p[3] * 2;
+ }
+ length += genrep.length * 4;
+ }
+
+ /* XGE events may have sizes > 32 */
+ if ((genrep.response_type & 0x7f) == XCB_XGE_EVENT)
+ eventlength = genrep.length * 4;
+
+ buf = malloc(length + eventlength +
+ (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t)));
+ if(!buf)
+ {
+ _xcb_conn_shutdown(c);
+ return 0;
+ }
+
+ if(_xcb_in_read_block(c, buf, length) <= 0)
+ {
+ free(buf);
+ return 0;
+ }
+
+ /* pull in XGE event data if available, append after event struct */
+ if (eventlength)
+ {
+ if(_xcb_in_read_block(c, &((xcb_generic_event_t*)buf)[1], eventlength) <= 0)
+ {
+ free(buf);
+ return 0;
+ }
+ }
+
+ if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
+ {
+ free(buf);
+ return 1;
+ }
+
+ if(genrep.response_type != XCB_REPLY)
+ ((xcb_generic_event_t *) buf)->full_sequence = c->in.request_read;
+
+ /* reply, or checked error */
+ if( genrep.response_type == XCB_REPLY ||
+ (genrep.response_type == XCB_ERROR && pend && (pend->flags & XCB_REQUEST_CHECKED)))
+ {
+ struct reply_list *cur = malloc(sizeof(struct reply_list));
+ if(!cur)
+ {
+ _xcb_conn_shutdown(c);
+ free(buf);
+ return 0;
+ }
+ cur->reply = buf;
+ cur->next = 0;
+ *c->in.current_reply_tail = cur;
+ c->in.current_reply_tail = &cur->next;
+ if(c->in.readers && c->in.readers->request == c->in.request_read)
+ pthread_cond_signal(c->in.readers->data);
+ return 1;
+ }
+
+ /* event, or unchecked error */
+ event = malloc(sizeof(struct event_list));
+ if(!event)
+ {
+ _xcb_conn_shutdown(c);
+ free(buf);
+ return 0;
+ }
+ event->event = buf;
+ event->next = 0;
+ *c->in.events_tail = event;
+ c->in.events_tail = &event->next;
+ pthread_cond_signal(&c->in.event_cond);
+ return 1; /* I have something for you... */
+}
+
+static xcb_generic_event_t *get_event(xcb_connection_t *c)
+{
+ struct event_list *cur = c->in.events;
+ xcb_generic_event_t *ret;
+ if(!c->in.events)
+ return 0;
+ ret = cur->event;
+ c->in.events = cur->next;
+ if(!cur->next)
+ c->in.events_tail = &c->in.events;
+ free(cur);
+ return ret;
+}
+
+static void free_reply_list(struct reply_list *head)
+{
+ while(head)
+ {
+ struct reply_list *cur = head;
+ head = cur->next;
+ free(cur->reply);
+ free(cur);
+ }
+}
+
+static int read_block(const int fd, void *buf, const ssize_t len)
+{
+ int done = 0;
+ while(done < len)
+ {
+ int ret = recv(fd, ((char *) buf) + done, len - done,MSG_WAITALL);
+ if(ret > 0)
+ done += ret;
+#ifndef _WIN32
+ if(ret < 0 && errno == EAGAIN)
+#else
+ if(ret == SOCKET_ERROR && WSAGetLastError() == WSAEWOULDBLOCK)
+#endif /* !_Win32 */
+ {
+#if USE_POLL
+ struct pollfd pfd;
+ pfd.fd = fd;
+ pfd.events = POLLIN;
+ pfd.revents = 0;
+ do {
+ ret = poll(&pfd, 1, -1);
+ } while (ret == -1 && errno == EINTR);
+#else
+ fd_set fds;
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+
+ /* Initializing errno here makes sure that for Win32 this loop will execute only once */
+ errno = 0;
+ do {
+ ret = select(fd + 1, &fds, 0, 0, 0);
+ } while (ret == -1 && errno == EINTR);
+#endif /* USE_POLL */
+ }
+ if(ret <= 0)
+ return ret;
+ }
+ return len;
+}
+
+static int poll_for_reply(xcb_connection_t *c, uint64_t request, void **reply, xcb_generic_error_t **error)
+{
+ struct reply_list *head;
+
+ /* If an error occurred when issuing the request, fail immediately. */
+ if(!request)
+ head = 0;
+ /* We've read requests past the one we want, so if it has replies we have
+ * them all and they're in the replies map. */
+ else if(XCB_SEQUENCE_COMPARE(request, <, c->in.request_read))
+ {
+ head = _xcb_map_remove(c->in.replies, request);
+ if(head && head->next)
+ _xcb_map_put(c->in.replies, request, head->next);
+ }
+ /* We're currently processing the responses to the request we want, and we
+ * have a reply ready to return. So just return it without blocking. */
+ else if(request == c->in.request_read && c->in.current_reply)
+ {
+ head = c->in.current_reply;
+ c->in.current_reply = head->next;
+ if(!head->next)
+ c->in.current_reply_tail = &c->in.current_reply;
+ }
+ /* We know this request can't have any more replies, and we've already
+ * established it doesn't have a reply now. Don't bother blocking. */
+ else if(request == c->in.request_completed)
+ head = 0;
+ /* We may have more replies on the way for this request: block until we're
+ * sure. */
+ else
+ return 0;
+
+ if(error)
+ *error = 0;
+ *reply = 0;
+
+ if(head)
+ {
+ if(((xcb_generic_reply_t *) head->reply)->response_type == XCB_ERROR)
+ {
+ if(error)
+ *error = head->reply;
+ else
+ free(head->reply);
+ }
+ else
+ *reply = head->reply;
+
+ free(head);
+ }
+
+ return 1;
+}
+
+static void insert_reader(reader_list **prev_reader, reader_list *reader, uint64_t request, pthread_cond_t *cond)
+{
+ while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, request))
+ prev_reader = &(*prev_reader)->next;
+ reader->request = request;
+ reader->data = cond;
+ reader->next = *prev_reader;
+ *prev_reader = reader;
+}
+
+static void remove_reader(reader_list **prev_reader, reader_list *reader)
+{
+ while(*prev_reader && XCB_SEQUENCE_COMPARE((*prev_reader)->request, <=, reader->request))
+ if(*prev_reader == reader)
+ {
+ *prev_reader = (*prev_reader)->next;
+ break;
+ }
+}
+
+static void *wait_for_reply(xcb_connection_t *c, uint64_t request, xcb_generic_error_t **e)
+{
+ void *ret = 0;
+
+ /* If this request has not been written yet, write it. */
+ if(c->out.return_socket || _xcb_out_flush_to(c, request))
+ {
+ pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+ reader_list reader;
+
+ insert_reader(&c->in.readers, &reader, request, &cond);
+
+ while(!poll_for_reply(c, request, &ret, e))
+ if(!_xcb_conn_wait(c, &cond, 0, 0))
+ break;
+
+ remove_reader(&c->in.readers, &reader);
+ pthread_cond_destroy(&cond);
+ }
+
+ _xcb_in_wake_up_next_reader(c);
+ return ret;
+}
+
+static uint64_t widen(xcb_connection_t *c, unsigned int request)
+{
+ uint64_t widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
+ if(widened_request > c->out.request)
+ widened_request -= UINT64_C(1) << 32;
+ return widened_request;
+}
+
+/* Public interface */
+
+void *xcb_wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
+{
+ void *ret;
+ if(e)
+ *e = 0;
+ if(c->has_error)
+ return 0;
+
+ pthread_mutex_lock(&c->iolock);
+ ret = wait_for_reply(c, widen(c, request), e);
+ pthread_mutex_unlock(&c->iolock);
+ return ret;
+}
+
+static void insert_pending_discard(xcb_connection_t *c, pending_reply **prev_next, uint64_t seq)
+{
+ pending_reply *pend;
+ pend = malloc(sizeof(*pend));
+ if(!pend)
+ {
+ _xcb_conn_shutdown(c);
+ return;
+ }
+
+ pend->first_request = seq;
+ pend->last_request = seq;
+ pend->workaround = 0;
+ pend->flags = XCB_REQUEST_DISCARD_REPLY;
+ pend->next = *prev_next;
+ *prev_next = pend;
+
+ if(!pend->next)
+ c->in.pending_replies_tail = &pend->next;
+}
+
+static void discard_reply(xcb_connection_t *c, uint64_t request)
+{
+ void *reply;
+ pending_reply **prev_pend;
+
+ /* Free any replies or errors that we've already read. Stop if
+ * xcb_wait_for_reply would block or we've run out of replies. */
+ while(poll_for_reply(c, request, &reply, 0) && reply)
+ free(reply);
+
+ /* If we've proven there are no more responses coming, we're done. */
+ if(XCB_SEQUENCE_COMPARE(request, <=, c->in.request_completed))
+ return;
+
+ /* Walk the list of pending requests. Mark the first match for deletion. */
+ for(prev_pend = &c->in.pending_replies; *prev_pend; prev_pend = &(*prev_pend)->next)
+ {
+ if(XCB_SEQUENCE_COMPARE((*prev_pend)->first_request, >, request))
+ break;
+
+ if((*prev_pend)->first_request == request)
+ {
+ /* Pending reply found. Mark for discard: */
+ (*prev_pend)->flags |= XCB_REQUEST_DISCARD_REPLY;
+ return;
+ }
+ }
+
+ /* Pending reply not found (likely due to _unchecked request). Create one: */
+ insert_pending_discard(c, prev_pend, request);
+}
+
+void xcb_discard_reply(xcb_connection_t *c, unsigned int sequence)
+{
+ if(c->has_error)
+ return;
+
+ /* If an error occurred when issuing the request, fail immediately. */
+ if(!sequence)
+ return;
+
+ pthread_mutex_lock(&c->iolock);
+ discard_reply(c, widen(c, sequence));
+ pthread_mutex_unlock(&c->iolock);
+}
+
+int xcb_poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
+{
+ int ret;
+ if(c->has_error)
+ {
+ *reply = 0;
+ if(error)
+ *error = 0;
+ return 1; /* would not block */
+ }
+ assert(reply != 0);
+ pthread_mutex_lock(&c->iolock);
+ ret = poll_for_reply(c, widen(c, request), reply, error);
+ pthread_mutex_unlock(&c->iolock);
+ return ret;
+}
+
+xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c)
+{
+ xcb_generic_event_t *ret;
+ if(c->has_error)
+ return 0;
+ pthread_mutex_lock(&c->iolock);
+ /* get_event returns 0 on empty list. */
+ while(!(ret = get_event(c)))
+ if(!_xcb_conn_wait(c, &c->in.event_cond, 0, 0))
+ break;
+
+ _xcb_in_wake_up_next_reader(c);
+ pthread_mutex_unlock(&c->iolock);
+ return ret;
+}
+
+static xcb_generic_event_t *poll_for_next_event(xcb_connection_t *c, int queued)
+{
+ xcb_generic_event_t *ret = 0;
+ if(!c->has_error)
+ {
+ pthread_mutex_lock(&c->iolock);
+ /* FIXME: follow X meets Z architecture changes. */
+ ret = get_event(c);
+ if(!ret && !queued && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
+ ret = get_event(c);
+ pthread_mutex_unlock(&c->iolock);
+ }
+ return ret;
+}
+
+xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
+{
+ return poll_for_next_event(c, 0);
+}
+
+xcb_generic_event_t *xcb_poll_for_queued_event(xcb_connection_t *c)
+{
+ return poll_for_next_event(c, 1);
+}
+
+xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie)
+{
+ uint64_t request;
+ xcb_generic_error_t *ret = 0;
+ void *reply;
+ if(c->has_error)
+ return 0;
+ pthread_mutex_lock(&c->iolock);
+ request = widen(c, cookie.sequence);
+ if(XCB_SEQUENCE_COMPARE(request, >=, c->in.request_expected)
+ && XCB_SEQUENCE_COMPARE(request, >, c->in.request_completed))
+ {
+ _xcb_out_send_sync(c);
+ _xcb_out_flush_to(c, c->out.request);
+ }
+ reply = wait_for_reply(c, request, &ret);
+ assert(!reply);
+ pthread_mutex_unlock(&c->iolock);
+ return ret;
+}
+
+/* Private interface */
+
+int _xcb_in_init(_xcb_in *in)
+{
+ if(pthread_cond_init(&in->event_cond, 0))
+ return 0;
+ in->reading = 0;
+
+ in->queue_len = 0;
+
+ in->request_read = 0;
+ in->request_completed = 0;
+
+ in->replies = _xcb_map_new();
+ if(!in->replies)
+ return 0;
+
+ in->current_reply_tail = &in->current_reply;
+ in->events_tail = &in->events;
+ in->pending_replies_tail = &in->pending_replies;
+
+ return 1;
+}
+
+void _xcb_in_destroy(_xcb_in *in)
+{
+ pthread_cond_destroy(&in->event_cond);
+ free_reply_list(in->current_reply);
+ _xcb_map_delete(in->replies, (void (*)(void *)) free_reply_list);
+ while(in->events)
+ {
+ struct event_list *e = in->events;
+ in->events = e->next;
+ free(e->event);
+ free(e);
+ }
+ while(in->pending_replies)
+ {
+ pending_reply *pend = in->pending_replies;
+ in->pending_replies = pend->next;
+ free(pend);
+ }
+}
+
+void _xcb_in_wake_up_next_reader(xcb_connection_t *c)
+{
+ int pthreadret;
+ if(c->in.readers)
+ pthreadret = pthread_cond_signal(c->in.readers->data);
+ else
+ pthreadret = pthread_cond_signal(&c->in.event_cond);
+ assert(pthreadret == 0);
+}
+
+int _xcb_in_expect_reply(xcb_connection_t *c, uint64_t request, enum workarounds workaround, int flags)
+{
+ pending_reply *pend = malloc(sizeof(pending_reply));
+ assert(workaround != WORKAROUND_NONE || flags != 0);
+ if(!pend)
+ {
+ _xcb_conn_shutdown(c);
+ return 0;
+ }
+ pend->first_request = pend->last_request = request;
+ pend->workaround = workaround;
+ pend->flags = flags;
+ pend->next = 0;
+ *c->in.pending_replies_tail = pend;
+ c->in.pending_replies_tail = &pend->next;
+ return 1;
+}
+
+void _xcb_in_replies_done(xcb_connection_t *c)
+{
+ struct pending_reply *pend;
+ if (c->in.pending_replies_tail != &c->in.pending_replies)
+ {
+ pend = container_of(c->in.pending_replies_tail, struct pending_reply, next);
+ if(pend->workaround == WORKAROUND_EXTERNAL_SOCKET_OWNER)
+ {
+ pend->last_request = c->out.request;
+ pend->workaround = WORKAROUND_NONE;
+ }
+ }
+}
+
+int _xcb_in_read(xcb_connection_t *c)
+{
+ int n = recv(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len,MSG_WAITALL);
+ if(n > 0)
+ c->in.queue_len += n;
+ while(read_packet(c))
+ /* empty */;
+#ifndef _WIN32
+ if((n > 0) || (n < 0 && errno == EAGAIN))
+#else
+ if((n > 0) || (n < 0 && WSAGetLastError() == WSAEWOULDBLOCK))
+#endif /* !_WIN32 */
+ return 1;
+ _xcb_conn_shutdown(c);
+ return 0;
+}
+
+int _xcb_in_read_block(xcb_connection_t *c, void *buf, int len)
+{
+ int done = c->in.queue_len;
+ if(len < done)
+ done = len;
+
+ memcpy(buf, c->in.queue, done);
+ c->in.queue_len -= done;
+ memmove(c->in.queue, c->in.queue + done, c->in.queue_len);
+
+ if(len > done)
+ {
+ int ret = read_block(c->fd, (char *) buf + done, len - done);
+ if(ret <= 0)
+ {
+ _xcb_conn_shutdown(c);
+ return ret;
+ }
+ }
+
+ return len;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-06 10:49:49 +0000