/* 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. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.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 */
#include "xcb.h"
#include "xcbext.h"
#include "xcbint.h"
#define XCB_ERROR 0
#define XCB_REPLY 1
#define XCB_XGE_EVENT 35
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;
};
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;
typedef struct special_list {
xcb_special_event_t *se;
struct special_list *next;
} special_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;
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;
/* 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;
/* 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 & 0x7f) == XCB_XGE_EVENT)
eventlength = genrep.length * 4;
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_CLOSED_MEM_INSUFFICIENT);
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 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);
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, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
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, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
free(buf);
return 0;
}
event->event = buf;
event->next = 0;
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... */
}
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, 0);
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 insert_special(special_list **prev_special, special_list *special, xcb_special_event_t *se)
{
special->se = se;
special->next = *prev_special;
*prev_special = special;
}
static void remove_special(special_list **prev_special, special_list *special)
{
while(*prev_special)
{
if(*prev_special == special)
{
*prev_special = (*prev_special)->next;
break;
}
prev_special = &(*prev_special)->next;
}
}
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;
}
void *xcb_wait_for_reply64(xcb_connection_t *c, uint64_t 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, 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_CLOSED_MEM_INSUFFICIENT);
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);
}
void xcb_discard_reply64(xcb_connection_t *c, uint64_t 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, widen(c, request), reply, error);
if(!ret && c->in.reading == 0 && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
ret = poll_for_reply(c, widen(c, request), reply, error);
pthread_mutex_unlock(&c->iolock);
return ret;
}
int xcb_poll_for_reply64(xcb_connection_t *c, uint64_t 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);
if(!ret && c->in.reading == 0 && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
ret = poll_for_reply(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 && 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);
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;
}
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);
if(!event && c->in.reading == 0 && _xcb_in_read(c)) /* _xcb_in_read shuts down the connection on error */
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)
{
special_list special;
xcb_generic_event_t *event;
if(c->has_error)
return 0;
pthread_mutex_lock(&c->iolock);
insert_special(&c->in.special_waiters, &special, se);
/* 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;
remove_special(&c->in.special_waiters, &special);
_xcb_in_wake_up_next_reader(c);
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)
{
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 if(c->in.special_waiters)
pthreadret = pthread_cond_signal(&c->in.special_waiters->se->special_event_cond);
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, XCB_CONN_CLOSED_MEM_INSUFFICIENT);
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)
{
if (XCB_SEQUENCE_COMPARE(pend->first_request, <=, c->out.request)) {
pend->last_request = c->out.request;
pend->workaround = WORKAROUND_NONE;
} else {
/* The socket was taken, but no requests were actually sent
* so just discard the pending_reply that was created.
*/
struct pending_reply **prev_next = &c->in.pending_replies;
while (*prev_next != pend)
prev_next = &(*prev_next)->next;
*prev_next = NULL;
c->in.pending_replies_tail = prev_next;
free(pend);
}
}
}
}
int _xcb_in_read(xcb_connection_t *c)
{
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,
};
union {
struct cmsghdr cmsghdr;
char buf[CMSG_SPACE(XCB_MAX_PASS_FD * sizeof(int))];
} cmsgbuf;
struct msghdr msg = {
.msg_name = NULL,
.msg_namelen = 0,
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = cmsgbuf.buf,
.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;
if (msg.msg_controllen >= sizeof (struct cmsghdr)) {
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_ERROR);
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, XCB_CONN_ERROR);
return ret;
}
}
return len;
}