/* Stuff that reads stuff from the server. */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#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 xcb_special_event {
+
+ struct xcb_special_event *next;
+
+ /* Match XGE events for the specific extension and event ID (the
+ * first 32 bit word after evtype)
+ */
+ uint8_t extension;
+ uint32_t eid;
+ uint32_t *stamp;
+
+ struct event_list *events;
+ struct event_list **events_tail;
+
+ pthread_cond_t special_event_cond;
+};
+
struct reply_list {
void *reply;
struct reply_list *next;
} pending_reply;
typedef struct reader_list {
- unsigned int request;
+ 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;
+ }
+}
+
+#if HAVE_SENDMSG
+static int read_fds(xcb_connection_t *c, int *fds, int nfd)
+{
+ int *ifds = &c->in.in_fd.fd[c->in.in_fd.ifd];
+ int infd = c->in.in_fd.nfd - c->in.in_fd.ifd;
+
+ if (nfd > infd)
+ return 0;
+ memcpy(fds, ifds, nfd * sizeof (int));
+ c->in.in_fd.ifd += nfd;
+ return 1;
+}
+#endif
+
+typedef struct xcb_ge_special_event_t {
+ uint8_t response_type; /**< */
+ uint8_t extension; /**< */
+ uint16_t sequence; /**< */
+ uint32_t length; /**< */
+ uint16_t evtype; /**< */
+ uint8_t pad0[2]; /**< */
+ uint32_t eid; /**< */
+ uint8_t pad1[16]; /**< */
+} xcb_ge_special_event_t;
+
+static int event_special(xcb_connection_t *c,
+ struct event_list *event)
+{
+ struct xcb_special_event *special_event;
+ struct xcb_ge_special_event_t *ges = (void *) event->event;
+
+ /* Special events are always XGE events */
+ if ((ges->response_type & 0x7f) != XCB_XGE_EVENT)
+ return 0;
+
+ for (special_event = c->in.special_events;
+ special_event;
+ special_event = special_event->next)
+ {
+ if (ges->extension == special_event->extension &&
+ ges->eid == special_event->eid)
+ {
+ *special_event->events_tail = event;
+ special_event->events_tail = &event->next;
+ if (special_event->stamp)
+ ++(*special_event->stamp);
+ pthread_cond_signal(&special_event->special_event_cond);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
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 */
+ uint64_t length = 32;
+ uint64_t eventlength = 0; /* length after first 32 bytes for GenericEvents */
+ int nfd = 0; /* Number of file descriptors attached to the reply */
+ uint64_t bufsize;
void *buf;
pending_reply *pend = 0;
struct event_list *event;
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)
genrep.length = p[2] * p[3] * 2;
}
length += genrep.length * 4;
+
+ /* XXX a bit of a hack -- we "know" that all FD replys place
+ * the number of fds in the pad0 byte */
+ if (pend && pend->flags & XCB_REQUEST_REPLY_FDS)
+ nfd = genrep.pad0;
}
/* XGE events may have sizes > 32 */
- if (genrep.response_type == XCB_XGE_EVENT)
+ 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)));
+ bufsize = length + eventlength + nfd * sizeof(int) +
+ (genrep.response_type == XCB_REPLY ? 0 : sizeof(uint32_t));
+ if (bufsize < INT32_MAX)
+ buf = malloc((size_t) bufsize);
+ else
+ buf = NULL;
if(!buf)
{
- _xcb_conn_shutdown(c);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
return 0;
}
}
}
+#if HAVE_SENDMSG
+ if (nfd)
+ {
+ if (!read_fds(c, (int *) &((char *) buf)[length], nfd))
+ {
+ free(buf);
+ return 0;
+ }
+ }
+#endif
+
if(pend && (pend->flags & XCB_REQUEST_DISCARD_REPLY))
{
free(buf);
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);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
free(buf);
return 0;
}
cur->next = 0;
*c->in.current_reply_tail = cur;
c->in.current_reply_tail = &cur->next;
- 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;
- }
- }
+ if(c->in.readers && c->in.readers->request == c->in.request_read)
+ pthread_cond_signal(c->in.readers->data);
return 1;
}
event = malloc(sizeof(struct event_list));
if(!event)
{
- _xcb_conn_shutdown(c);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
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);
+
+ if (!event_special(c, event)) {
+ *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... */
}
int done = 0;
while(done < len)
{
- int ret = recv(fd, ((char *) buf) + done, len - done,MSG_WAITALL);
+ int ret = recv(fd, ((char *) buf) + done, len - done, 0);
if(ret > 0)
done += ret;
#ifndef _WIN32
return len;
}
-static int poll_for_reply(xcb_connection_t *c, unsigned int request, void **reply, xcb_generic_error_t **error)
+static int poll_for_reply(xcb_connection_t *c, uint64_t 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(XCB_SEQUENCE_COMPARE_32(request, <, c->in.request_read))
+ else if(XCB_SEQUENCE_COMPARE(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(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_read) && c->in.current_reply)
+ else if(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(XCB_SEQUENCE_COMPARE_32(request, ==, c->in.request_completed))
+ 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. */
return 1;
}
-static void *wait_for_reply(xcb_connection_t *c, unsigned int request, xcb_generic_error_t **e)
+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;
- uint64_t 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(c->out.return_socket || _xcb_out_flush_to(c, widened_request))
+ if(c->out.return_socket || _xcb_out_flush_to(c, request))
{
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
reader_list reader;
- reader_list **prev_reader;
-
- 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;
- *prev_reader = &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;
- 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;
- }
- }
+ remove_reader(&c->in.readers, &reader);
pthread_cond_destroy(&cond);
}
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)
return 0;
pthread_mutex_lock(&c->iolock);
- ret = wait_for_reply(c, request, e);
+ ret = wait_for_reply(c, widen(c, request), e);
pthread_mutex_unlock(&c->iolock);
return ret;
}
+int *xcb_get_reply_fds(xcb_connection_t *c, void *reply, size_t reply_size)
+{
+ return (int *) (&((char *) reply)[reply_size]);
+}
+
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);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
return;
}
c->in.pending_replies_tail = &pend->next;
}
-static void discard_reply(xcb_connection_t *c, unsigned int request)
+static void discard_reply(xcb_connection_t *c, uint64_t request)
{
void *reply;
pending_reply **prev_pend;
- uint64_t widened_request;
/* 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. */
free(reply);
/* If we've proven there are no more responses coming, we're done. */
- if(XCB_SEQUENCE_COMPARE_32(request, <=, c->in.request_completed))
+ 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_32((*prev_pend)->first_request, >, request))
+ if(XCB_SEQUENCE_COMPARE((*prev_pend)->first_request, >, request))
break;
- if(XCB_SEQUENCE_COMPARE_32((*prev_pend)->first_request, ==, request))
+ if((*prev_pend)->first_request == request)
{
/* Pending reply found. Mark for discard: */
(*prev_pend)->flags |= XCB_REQUEST_DISCARD_REPLY;
}
/* 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);
+ insert_pending_discard(c, prev_pend, request);
}
void xcb_discard_reply(xcb_connection_t *c, unsigned int sequence)
return;
pthread_mutex_lock(&c->iolock);
- discard_reply(c, sequence);
+ discard_reply(c, widen(c, sequence));
pthread_mutex_unlock(&c->iolock);
}
}
assert(reply != 0);
pthread_mutex_lock(&c->iolock);
- ret = poll_for_reply(c, request, reply, error);
+ ret = poll_for_reply(c, widen(c, request), reply, error);
pthread_mutex_unlock(&c->iolock);
return ret;
}
return ret;
}
-xcb_generic_event_t *xcb_poll_for_event(xcb_connection_t *c)
+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 && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
+ if(!ret && !queued && c->in.reading == 0 && _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);
- if(XCB_SEQUENCE_COMPARE_32(cookie.sequence,>=,c->in.request_expected)
- && XCB_SEQUENCE_COMPARE_32(cookie.sequence,>,c->in.request_completed))
+ 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, cookie.sequence, &ret);
+ reply = wait_for_reply(c, request, &ret);
assert(!reply);
pthread_mutex_unlock(&c->iolock);
return ret;
}
+static xcb_generic_event_t *get_special_event(xcb_connection_t *c,
+ xcb_special_event_t *se)
+{
+ xcb_generic_event_t *event = NULL;
+ struct event_list *events;
+
+ if ((events = se->events) != NULL) {
+ event = events->event;
+ if (!(se->events = events->next))
+ se->events_tail = &se->events;
+ free (events);
+ }
+ return event;
+}
+
+xcb_generic_event_t *xcb_poll_for_special_event(xcb_connection_t *c,
+ xcb_special_event_t *se)
+{
+ xcb_generic_event_t *event;
+
+ if(c->has_error)
+ return 0;
+ pthread_mutex_lock(&c->iolock);
+ event = get_special_event(c, se);
+ pthread_mutex_unlock(&c->iolock);
+ return event;
+}
+
+xcb_generic_event_t *xcb_wait_for_special_event(xcb_connection_t *c,
+ xcb_special_event_t *se)
+{
+ xcb_generic_event_t *event;
+
+ if(c->has_error)
+ return 0;
+ pthread_mutex_lock(&c->iolock);
+
+ /* get_special_event returns 0 on empty list. */
+ while(!(event = get_special_event(c, se)))
+ if(!_xcb_conn_wait(c, &se->special_event_cond, 0, 0))
+ break;
+
+ pthread_mutex_unlock(&c->iolock);
+ return event;
+}
+
+xcb_special_event_t *
+xcb_register_for_special_xge(xcb_connection_t *c,
+ xcb_extension_t *ext,
+ uint32_t eid,
+ uint32_t *stamp)
+{
+ xcb_special_event_t *se;
+ const xcb_query_extension_reply_t *ext_reply;
+
+ if(c->has_error)
+ return NULL;
+ ext_reply = xcb_get_extension_data(c, ext);
+ if (!ext_reply)
+ return NULL;
+ pthread_mutex_lock(&c->iolock);
+ for (se = c->in.special_events; se; se = se->next) {
+ if (se->extension == ext_reply->major_opcode &&
+ se->eid == eid) {
+ pthread_mutex_unlock(&c->iolock);
+ return NULL;
+ }
+ }
+ se = calloc(1, sizeof(xcb_special_event_t));
+ if (!se) {
+ pthread_mutex_unlock(&c->iolock);
+ return NULL;
+ }
+
+ se->extension = ext_reply->major_opcode;
+ se->eid = eid;
+
+ se->events = NULL;
+ se->events_tail = &se->events;
+ se->stamp = stamp;
+
+ pthread_cond_init(&se->special_event_cond, 0);
+
+ se->next = c->in.special_events;
+ c->in.special_events = se;
+ pthread_mutex_unlock(&c->iolock);
+ return se;
+}
+
+void
+xcb_unregister_for_special_event(xcb_connection_t *c,
+ xcb_special_event_t *se)
+{
+ xcb_special_event_t *s, **prev;
+ struct event_list *events, *next;
+
+ if (!se)
+ return;
+
+ if (c->has_error)
+ return;
+
+ pthread_mutex_lock(&c->iolock);
+
+ for (prev = &c->in.special_events; (s = *prev) != NULL; prev = &(s->next)) {
+ if (s == se) {
+ *prev = se->next;
+ for (events = se->events; events; events = next) {
+ next = events->next;
+ free (events->event);
+ free (events);
+ }
+ pthread_cond_destroy(&se->special_event_cond);
+ free (se);
+ break;
+ }
+ }
+ pthread_mutex_unlock(&c->iolock);
+}
+
/* Private interface */
int _xcb_in_init(_xcb_in *in)
assert(workaround != WORKAROUND_NONE || flags != 0);
if(!pend)
{
- _xcb_conn_shutdown(c);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
return 0;
}
pend->first_request = pend->last_request = request;
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)
+ int n;
+
+#if HAVE_SENDMSG
+ struct iovec iov = {
+ .iov_base = c->in.queue + c->in.queue_len,
+ .iov_len = sizeof(c->in.queue) - c->in.queue_len,
+ };
+ char cmsgbuf[CMSG_SPACE(sizeof(int) * XCB_MAX_PASS_FD)];
+ struct msghdr msg = {
+ .msg_name = NULL,
+ .msg_namelen = 0,
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = cmsgbuf,
+ .msg_controllen = CMSG_SPACE(sizeof(int) * (XCB_MAX_PASS_FD - c->in.in_fd.nfd)),
+ };
+ n = recvmsg(c->fd, &msg, 0);
+
+ /* Check for truncation errors. Only MSG_CTRUNC is
+ * probably possible here, which would indicate that
+ * the sender tried to transmit more than XCB_MAX_PASS_FD
+ * file descriptors.
+ */
+ if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_FDPASSING_FAILED);
+ return 0;
+ }
+#else
+ n = recv(c->fd, c->in.queue + c->in.queue_len, sizeof(c->in.queue) - c->in.queue_len, 0);
+#endif
+ if(n > 0) {
+#if HAVE_SENDMSG
+ struct cmsghdr *hdr;
+
+ for (hdr = CMSG_FIRSTHDR(&msg); hdr; hdr = CMSG_NXTHDR(&msg, hdr)) {
+ if (hdr->cmsg_level == SOL_SOCKET && hdr->cmsg_type == SCM_RIGHTS) {
+ int nfd = (hdr->cmsg_len - CMSG_LEN(0)) / sizeof (int);
+ memcpy(&c->in.in_fd.fd[c->in.in_fd.nfd], CMSG_DATA(hdr), nfd * sizeof (int));
+ c->in.in_fd.nfd += nfd;
+ }
+ }
+#endif
c->in.queue_len += n;
+ }
while(read_packet(c))
/* empty */;
+#if HAVE_SENDMSG
+ if (c->in.in_fd.nfd) {
+ c->in.in_fd.nfd -= c->in.in_fd.ifd;
+ memmove(&c->in.in_fd.fd[0],
+ &c->in.in_fd.fd[c->in.in_fd.ifd],
+ c->in.in_fd.nfd * sizeof (int));
+ c->in.in_fd.ifd = 0;
+
+ /* If we have any left-over file descriptors after emptying
+ * the input buffer, then the server sent some that we weren't
+ * expecting. Close them and mark the connection as broken;
+ */
+ if (c->in.queue_len == 0 && c->in.in_fd.nfd != 0) {
+ int i;
+ for (i = 0; i < c->in.in_fd.nfd; i++)
+ close(c->in.in_fd.fd[i]);
+ _xcb_conn_shutdown(c, XCB_CONN_CLOSED_FDPASSING_FAILED);
+ return 0;
+ }
+ }
+#endif
#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);
+ _xcb_conn_shutdown(c, XCB_CONN_ERROR);
return 0;
}
int ret = read_block(c->fd, (char *) buf + done, len - done);
if(ret <= 0)
{
- _xcb_conn_shutdown(c);
+ _xcb_conn_shutdown(c, XCB_CONN_ERROR);
return ret;
}
}
projects / free-sw / xcb / libxcb / blobdiff