#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
+#if USE_POLL
+#include <poll.h>
+#else
+#include <sys/select.h>
+#endif
-#define XCBError 0
-#define XCBReply 1
+#define XCB_ERROR 0
+#define XCB_REPLY 1
+#define XCB_XGE_EVENT 35
struct event_list {
- XCBGenericEvent *event;
+ xcb_generic_event_t *event;
struct event_list *next;
};
};
typedef struct pending_reply {
- unsigned int request;
+ uint64_t first_request;
+ uint64_t last_request;
enum workarounds workaround;
int flags;
struct pending_reply *next;
struct reader_list *next;
} reader_list;
-static void wake_up_next_reader(XCBConnection *c)
+static int read_packet(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);
-}
-
-static int read_packet(XCBConnection *c)
-{
- XCBGenericRep genrep;
+ 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;
memcpy(&genrep, c->in.queue, sizeof(genrep));
/* Compute 32-bit sequence number of this packet. */
- if((genrep.response_type & 0x7f) != XCBKeymapNotify)
+ if((genrep.response_type & 0x7f) != XCB_KEYMAP_NOTIFY)
{
- int lastread = c->in.request_read;
- c->in.request_read = (lastread & 0xffff0000) | genrep.sequence;
- if(c->in.request_read < lastread)
+ 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(c->in.request_read > c->in.request_expected)
+ 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)
}
c->in.request_completed = c->in.request_read - 1;
}
- if(genrep.response_type != XCBReply) /* error or event */
- c->in.request_completed = c->in.request_read; /* XXX: does event/error imply no more replies? */
- while(c->in.pending_replies && c->in.pending_replies->request <= c->in.request_completed)
+ 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;
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;
}
- if(genrep.response_type == XCBError || genrep.response_type == XCBReply)
+ if(genrep.response_type == XCB_ERROR || genrep.response_type == XCB_REPLY)
{
pend = c->in.pending_replies;
- if(pend && pend->request != c->in.request_read)
+ 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 == XCBReply)
+ if(genrep.response_type == XCB_REPLY)
{
if(pend && pend->workaround == WORKAROUND_GLX_GET_FB_CONFIGS_BUG)
{
- CARD32 *p = (CARD32 *) c->in.queue;
+ uint32_t *p = (uint32_t *) c->in.queue;
genrep.length = p[2] * p[3] * 2;
}
length += genrep.length * 4;
}
- buf = malloc(length + (genrep.response_type == XCBReply ? 0 : sizeof(CARD32)));
+ /* XGE events may have sizes > 32 */
+ if (genrep.response_type == 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 != XCBReply)
- ((XCBGenericEvent *) buf)->full_sequence = c->in.request_read;
+ 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 == XCBReply ||
- (genrep.response_type == XCBError && pend && (pend->flags & XCB_REQUEST_CHECKED)))
+ if( genrep.response_type == XCB_REPLY ||
+ (genrep.response_type == XCB_ERROR && pend && (pend->flags & XCB_REQUEST_CHECKED)))
{
reader_list *reader;
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;
- for(reader = c->in.readers; reader && reader->request <= c->in.request_read; reader = reader->next)
- if(reader->request == c->in.request_read)
+ for(reader = c->in.readers;
+ reader &&
+ XCB_SEQUENCE_COMPARE_32(reader->request, <=, c->in.request_read);
+ reader = reader->next)
+ {
+ if(XCB_SEQUENCE_COMPARE_32(reader->request, ==, c->in.request_read))
{
pthread_cond_signal(reader->data);
break;
}
+ }
return 1;
}
event = malloc(sizeof(struct event_list));
if(!event)
{
+ _xcb_conn_shutdown(c);
free(buf);
return 0;
}
return 1; /* I have something for you... */
}
-static XCBGenericEvent *get_event(XCBConnection *c)
+static xcb_generic_event_t *get_event(xcb_connection_t *c)
{
struct event_list *cur = c->in.events;
- XCBGenericEvent *ret;
+ xcb_generic_event_t *ret;
if(!c->in.events)
return 0;
ret = cur->event;
}
}
-static int read_block(const int fd, void *buf, const size_t len)
+static int read_block(const int fd, void *buf, const ssize_t len)
{
int done = 0;
while(done < len)
done += ret;
if(ret < 0 && errno == EAGAIN)
{
+#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);
do {
ret = select(fd + 1, &fds, 0, 0, 0);
} while (ret == -1 && errno == EINTR);
+#endif
}
if(ret <= 0)
return ret;
return len;
}
-static int poll_for_reply(XCBConnection *c, unsigned int request, void **reply, XCBGenericError **error)
+static int poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
{
struct reply_list *head;
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(request < c->in.request_read)
+ else if(XCB_SEQUENCE_COMPARE_32(request, <, c->in.request_read))
{
head = _xcb_map_remove(c->in.replies, request);
if(head && 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)
+ else if(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_read) && c->in.current_reply)
{
head = c->in.current_reply;
c->in.current_reply = head->next;
}
/* 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)
+ else if(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_completed))
head = 0;
/* We may have more replies on the way for this request: block until we're
* sure. */
if(head)
{
- if(((XCBGenericRep *) head->reply)->response_type == XCBError)
+ if(((xcb_generic_reply_t *) head->reply)->response_type == XCB_ERROR)
{
if(error)
*error = head->reply;
/* Public interface */
-void *XCBWaitForReply(XCBConnection *c, unsigned int request, XCBGenericError **e)
+void *xcb_wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
{
+ uint64_t widened_request;
void *ret = 0;
if(e)
*e = 0;
+ if(c->has_error)
+ return 0;
pthread_mutex_lock(&c->iolock);
+ widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
+ if(widened_request > c->out.request)
+ widened_request -= UINT64_C(1) << 32;
+
/* If this request has not been written yet, write it. */
- if(_xcb_out_flush_to(c, request))
+ if(c->out.return_socket || _xcb_out_flush_to(c, widened_request))
{
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
reader_list reader;
reader_list **prev_reader;
- for(prev_reader = &c->in.readers; *prev_reader && (*prev_reader)->request <= request; prev_reader = &(*prev_reader)->next)
+ for(prev_reader = &c->in.readers;
+ *prev_reader &&
+ XCB_SEQUENCE_COMPARE_32((*prev_reader)->request, <=, request);
+ prev_reader = &(*prev_reader)->next)
+ {
/* empty */;
+ }
reader.request = request;
reader.data = &cond;
reader.next = *prev_reader;
if(!_xcb_conn_wait(c, &cond, 0, 0))
break;
- for(prev_reader = &c->in.readers; *prev_reader && (*prev_reader)->request <= request; prev_reader = &(*prev_reader)->next)
+ for(prev_reader = &c->in.readers;
+ *prev_reader &&
+ XCB_SEQUENCE_COMPARE_32((*prev_reader)->request, <=, request);
+ prev_reader = &(*prev_reader)->next)
+ {
if(*prev_reader == &reader)
{
*prev_reader = (*prev_reader)->next;
break;
}
+ }
pthread_cond_destroy(&cond);
}
- wake_up_next_reader(c);
+ _xcb_in_wake_up_next_reader(c);
pthread_mutex_unlock(&c->iolock);
return ret;
}
-int XCBPollForReply(XCBConnection *c, unsigned int request, void **reply, XCBGenericError **error)
+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, unsigned int request)
+{
+ pending_reply *pend = 0;
+ pending_reply **prev_pend;
+ uint64_t widened_request;
+
+ /* 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. */
+ if(XCB_SEQUENCE_COMPARE_32(request, <, c->in.request_read))
+ {
+ struct reply_list *head;
+ head = _xcb_map_remove(c->in.replies, request);
+ while (head)
+ {
+ struct reply_list *next = head->next;
+ free(head->reply);
+ free(head);
+ head = next;
+ }
+ return;
+ }
+
+ /* We're currently processing the responses to the request we want, and we
+ * have a reply ready to return. Free it, and mark the pend to free any further
+ * replies. */
+ if(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_read) && c->in.current_reply)
+ {
+ struct reply_list *head;
+ head = c->in.current_reply;
+ c->in.current_reply = NULL;
+ c->in.current_reply_tail = &c->in.current_reply;
+ while (head)
+ {
+ struct reply_list *next = head->next;
+ free(head->reply);
+ free(head);
+ head = next;
+ }
+
+ 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;
+ if(pend)
+ pend->flags |= XCB_REQUEST_DISCARD_REPLY;
+ else
+ insert_pending_discard(c, &c->in.pending_replies, c->in.request_read);
+
+ 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_32((*prev_pend)->first_request, >, request))
+ break;
+
+ if(XCB_SEQUENCE_COMPARE_32((*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: */
+ widened_request = (c->out.request & UINT64_C(0xffffffff00000000)) | request;
+ if(widened_request > c->out.request)
+ widened_request -= UINT64_C(1) << 32;
+
+ insert_pending_discard(c, prev_pend, widened_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, 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, request, reply, error);
return ret;
}
-XCBGenericEvent *XCBWaitEvent(XCBConnection *c)
-{
- return XCBWaitForEvent(c);
-}
-
-XCBGenericEvent *XCBWaitForEvent(XCBConnection *c)
+xcb_generic_event_t *xcb_wait_for_event(xcb_connection_t *c)
{
- XCBGenericEvent *ret;
+ 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;
- wake_up_next_reader(c);
+ _xcb_in_wake_up_next_reader(c);
pthread_mutex_unlock(&c->iolock);
return ret;
}
-XCBGenericEvent *XCBPollForEvent(XCBConnection *c, int *error)
+xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
{
- XCBGenericEvent *ret = 0;
- pthread_mutex_lock(&c->iolock);
- if(error)
- *error = 0;
- /* FIXME: follow X meets Z architecture changes. */
- if(_xcb_in_read(c))
- ret = get_event(c);
- else if(error)
- *error = -1;
- else
+ xcb_generic_event_t *ret = 0;
+ if(!c->has_error)
{
- fprintf(stderr, "XCBPollForEvent: I/O error occured, but no handler provided.\n");
- abort();
+ pthread_mutex_lock(&c->iolock);
+ /* FIXME: follow X meets Z architecture changes. */
+ ret = get_event(c);
+ if(!ret && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
+ ret = get_event(c);
+ pthread_mutex_unlock(&c->iolock);
}
- pthread_mutex_unlock(&c->iolock);
return ret;
}
-unsigned int XCBGetRequestRead(XCBConnection *c)
+xcb_generic_error_t *xcb_request_check(xcb_connection_t *c, xcb_void_cookie_t cookie)
{
- unsigned int ret;
- pthread_mutex_lock(&c->iolock);
- /* FIXME: follow X meets Z architecture changes. */
- _xcb_in_read(c);
- ret = c->in.request_read;
- pthread_mutex_unlock(&c->iolock);
+ /* FIXME: this could hold the lock to avoid syncing unnecessarily, but
+ * that would require factoring the locking out of xcb_get_input_focus,
+ * xcb_get_input_focus_reply, and xcb_wait_for_reply. */
+ xcb_generic_error_t *ret;
+ void *reply;
+ if(c->has_error)
+ return 0;
+ if(XCB_SEQUENCE_COMPARE_32(cookie.sequence,>,c->in.request_expected)
+ && XCB_SEQUENCE_COMPARE_32(cookie.sequence,>,c->in.request_completed))
+ {
+ free(xcb_get_input_focus_reply(c, xcb_get_input_focus(c), &ret));
+ assert(!ret);
+ }
+ reply = xcb_wait_for_reply(c, cookie.sequence, &ret);
+ assert(!reply);
return ret;
}
}
}
-int _xcb_in_expect_reply(XCBConnection *c, unsigned int request, enum workarounds workaround, int flags)
+void _xcb_in_wake_up_next_reader(xcb_connection_t *c)
{
- if(workaround != WORKAROUND_NONE || flags != 0)
+ 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)
{
- pending_reply *pend = malloc(sizeof(pending_reply));
- if(!pend)
- return 0;
- pend->request = request;
- pend->workaround = workaround;
- pend->flags = flags;
- pend->next = 0;
- *c->in.pending_replies_tail = pend;
- c->in.pending_replies_tail = &pend->next;
+ _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;
}
-int _xcb_in_read(XCBConnection *c)
+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 = read(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len);
if(n > 0)
c->in.queue_len += n;
while(read_packet(c))
/* empty */;
- return (n > 0) || (n < 0 && errno == EAGAIN);
+ if((n > 0) || (n < 0 && errno == EAGAIN))
+ return 1;
+ _xcb_conn_shutdown(c);
+ return 0;
}
-int _xcb_in_read_block(XCBConnection *c, void *buf, int len)
+int _xcb_in_read_block(xcb_connection_t *c, void *buf, int len)
{
int 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;
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