svn merge ^/branches/released .

1 files changed, 396 insertions, 396 deletions

diff --git a/libxcb/src/xcb_conn.c b/libxcb/src/xcb_conn.c
index 1e58060ba..cb0e4ff67 100644
--- a/libxcb/src/xcb_conn.c
+++ b/libxcb/src/xcb_conn.c
@@ -1,396 +1,396 @@
-/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- * 
- * Except as contained in this notice, the names of the authors or their
- * institutions shall not be used in advertising or otherwise to promote the
- * sale, use or other dealings in this Software without prior written
- * authorization from the authors.
- */
-
-/* Connection management: the core of XCB. */
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#ifdef _MSC_VER
-#include <X11/Xwinsock.h>
-#define STDERR_FILENO stderr
-#else
-#include <netinet/in.h>
-#endif
-#include <fcntl.h>
-#include <errno.h>
-
-#include "xcb.h"
-#include "xcbint.h"
-#if USE_POLL
-#include <poll.h>
-#else
-#include <sys/select.h>
-#endif
-
-#include <X11/Xtrans/Xtrans.h>
-
-typedef struct {
-    uint8_t  status;
-    uint8_t  pad0[5];
-    uint16_t length;
-} xcb_setup_generic_t;
-
-static const int error_connection = 1;
-
-#ifdef _MSC_VER
-#undef close
-#define close(fd) closesocket(fd)
-
-size_t writev(int fildes, const struct iovec *iov, int iovcnt)
-{
-  int i, r;
-  char *p;
-  size_t l, sum;
-
-  /* We should buffer */
-  sum= 0;
-  for (i= 0; i<iovcnt; i++)
-  {
-    p= iov[i].iov_base;
-    l= iov[i].iov_len;
-    while (l > 0)
-    {
-      r= send(fildes, p, l, 0);
-      if (r <= 0)
-      {
-        errno =WSAGetLastError();
-        if(errno == WSAEWOULDBLOCK)
-          errno = EAGAIN;
-        if (sum)
-          return sum;
-        else
-          return r;
-      }
-      p += r;
-      l -= r;
-      sum += r;
-    }
-  }
-  return sum;
-}
-#endif
-
-static int set_fd_flags(const int fd)
-{
-#ifdef _MSC_VER
-    unsigned long arg = 1;
-    int ret = ioctlsocket (fd, FIONBIO, &arg);
-#else
-    int flags = fcntl(fd, F_GETFL, 0);
-    if(flags == -1)
-        return 0;
-    flags |= O_NONBLOCK;
-    if(fcntl(fd, F_SETFL, flags) == -1)
-        return 0;
-    if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
-        return 0;
-#endif
-    return 1;
-}
-
-static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)
-{
-    static const char pad[3];
-    xcb_setup_request_t out;
-    struct iovec parts[6];
-    int count = 0;
-    static const uint32_t endian = 0x01020304;
-    int ret;
-
-    memset(&out, 0, sizeof(out));
-
-    /* B = 0x42 = MSB first, l = 0x6c = LSB first */
-    if(htonl(endian) == endian)
-        out.byte_order = 0x42;
-    else
-        out.byte_order = 0x6c;
-    out.protocol_major_version = X_PROTOCOL;
-    out.protocol_minor_version = X_PROTOCOL_REVISION;
-    out.authorization_protocol_name_len = 0;
-    out.authorization_protocol_data_len = 0;
-    parts[count].iov_len = sizeof(xcb_setup_request_t);
-    parts[count++].iov_base = (caddr_t) &out;
-    parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));
-    parts[count++].iov_base = (char *) pad;
-
-    if(auth_info)
-    {
-        parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;
-        parts[count++].iov_base = auth_info->name;
-        parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);
-        parts[count++].iov_base = (char *) pad;
-        parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;
-        parts[count++].iov_base = auth_info->data;
-        parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);
-        parts[count++].iov_base = (char *) pad;
-    }
-    assert(count <= (int) (sizeof(parts) / sizeof(*parts)));
-
-    pthread_mutex_lock(&c->iolock);
-    ret = _xcb_out_send(c, parts, count);
-    pthread_mutex_unlock(&c->iolock);
-    return ret;
-}
-
-static int read_setup(xcb_connection_t *c)
-{
-    /* Read the server response */
-    c->setup = malloc(sizeof(xcb_setup_generic_t));
-    if(!c->setup)
-        return 0;
-
-    if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))
-        return 0;
-
-    {
-        void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));
-        if(!tmp)
-            return 0;
-        c->setup = tmp;
-    }
-
-    if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)
-        return 0;
-
-    /* 0 = failed, 2 = authenticate, 1 = success */
-    switch(c->setup->status)
-    {
-    case 0: /* failed */
-        {
-            xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;
-            write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));
-            return 0;
-        }
-
-    case 2: /* authenticate */
-        {
-            xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;
-            write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));
-            return 0;
-        }
-    }
-
-    return 1;
-}
-
-/* precondition: there must be something for us to write. */
-static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)
-{
-    int n;
-    assert(!c->out.queue_len);
-    n = writev(c->fd, *vector, *count);
-    if(n < 0 && errno == EAGAIN)
-        return 1;
-    if(n <= 0)
-    {
-        _xcb_conn_shutdown(c);
-        return 0;
-    }
-
-    for(; *count; --*count, ++*vector)
-    {
-        int cur = (*vector)->iov_len;
-        if(cur > n)
-            cur = n;
-        (*vector)->iov_len -= cur;
-        (*vector)->iov_base = (char *) (*vector)->iov_base + cur;
-        n -= cur;
-        if((*vector)->iov_len)
-            break;
-    }
-    if(!*count)
-        *vector = 0;
-    assert(n == 0);
-    return 1;
-}
-
-/* Public interface */
-
-const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)
-{
-    if(c->has_error)
-        return 0;
-    /* doesn't need locking because it's never written to. */
-    return c->setup;
-}
-
-int xcb_get_file_descriptor(xcb_connection_t *c)
-{
-    if(c->has_error)
-        return -1;
-    /* doesn't need locking because it's never written to. */
-    return c->fd;
-}
-
-int xcb_connection_has_error(xcb_connection_t *c)
-{
-    /* doesn't need locking because it's read and written atomically. */
-    return c->has_error;
-}
-
-xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)
-{
-    xcb_connection_t* c;
-
-    c = calloc(1, sizeof(xcb_connection_t));
-    if(!c) {
-        close(fd);
-        return (xcb_connection_t *) &error_connection;
-    }
-
-    c->fd = fd;
-
-    if(!(
-        set_fd_flags(fd) &&
-        pthread_mutex_init(&c->iolock, 0) == 0 &&
-        _xcb_in_init(&c->in) &&
-        _xcb_out_init(&c->out) &&
-        write_setup(c, auth_info) &&
-        read_setup(c) &&
-        _xcb_ext_init(c) &&
-        _xcb_xid_init(c)
-        ))
-    {
-        xcb_disconnect(c);
-        return (xcb_connection_t *) &error_connection;
-    }
-
-    return c;
-}
-
-void xcb_disconnect(xcb_connection_t *c)
-{
-    if(c->has_error)
-        return;
-
-    free(c->setup);
-    close(c->fd);
-
-    pthread_mutex_destroy(&c->iolock);
-    _xcb_in_destroy(&c->in);
-    _xcb_out_destroy(&c->out);
-
-    _xcb_ext_destroy(c);
-    _xcb_xid_destroy(c);
-
-    free(c);
-}
-
-/* Private interface */
-
-void _xcb_conn_shutdown(xcb_connection_t *c)
-{
-    c->has_error = 1;
-}
-
-int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)
-{
-    int ret;
-#if USE_POLL
-    struct pollfd fd;
-#else
-    fd_set rfds, wfds;
-#endif
-
-    /* If the thing I should be doing is already being done, wait for it. */
-    if(count ? c->out.writing : c->in.reading)
-    {
-        pthread_cond_wait(cond, &c->iolock);
-        return 1;
-    }
-
-#if USE_POLL
-    memset(&fd, 0, sizeof(fd));
-    fd.fd = c->fd;
-    fd.events = POLLIN;
-#else
-    FD_ZERO(&rfds);
-    FD_SET(c->fd, &rfds);
-#endif
-    ++c->in.reading;
-
-#if USE_POLL
-    if(count)
-    {
-        fd.events |= POLLOUT;
-        ++c->out.writing;
-    }
-#else
-    FD_ZERO(&wfds);
-    if(count)
-    {
-        FD_SET(c->fd, &wfds);
-        ++c->out.writing;
-    }
-#endif
-
-    pthread_mutex_unlock(&c->iolock);
-    do {
-#if USE_POLL
-    ret = poll(&fd, 1, -1);
-#else
-	ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
-	if (ret==SOCKET_ERROR)
-	{
-	   ret=-1;
-           errno = WSAGetLastError();
-	   if (errno == WSAEINTR)
-		   errno=EINTR;
-	}
-#endif
-    } while (ret == -1 && errno == EINTR);
-    if (ret < 0)
-    {
-        _xcb_conn_shutdown(c);
-	ret = 0;
-    }
-    pthread_mutex_lock(&c->iolock);
-
-    if(ret)
-    {
-#if USE_POLL
-        if((fd.revents & POLLIN) == POLLIN)
-#else
-        if(FD_ISSET(c->fd, &rfds))
-#endif
-            ret = ret && _xcb_in_read(c);
-
-#if USE_POLL
-        if((fd.revents & POLLOUT) == POLLOUT)
-#else
-        if(FD_ISSET(c->fd, &wfds))
-#endif
-            ret = ret && write_vec(c, vector, count);
-    }
-
-    if(count)
-        --c->out.writing;
-    --c->in.reading;
-
-    return ret;
-}
+/* Copyright (C) 2001-2004 Bart Massey and Jamey Sharp.

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ * 

+ * The above copyright notice and this permission notice shall be included in

+ * all copies or substantial portions of the Software.

+ * 

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ * 

+ * Except as contained in this notice, the names of the authors or their

+ * institutions shall not be used in advertising or otherwise to promote the

+ * sale, use or other dealings in this Software without prior written

+ * authorization from the authors.

+ */

+

+/* Connection management: the core of XCB. */

+

+#include <assert.h>

+#include <string.h>

+#include <stdio.h>

+#include <unistd.h>

+#include <stdlib.h>

+#ifdef _MSC_VER

+#include <X11/Xwinsock.h>

+#define STDERR_FILENO stderr

+#else

+#include <netinet/in.h>

+#endif

+#include <fcntl.h>

+#include <errno.h>

+

+#include "xcb.h"

+#include "xcbint.h"

+#if USE_POLL

+#include <poll.h>

+#else

+#include <sys/select.h>

+#endif

+

+#include <X11/Xtrans/Xtrans.h>

+

+typedef struct {

+    uint8_t  status;

+    uint8_t  pad0[5];

+    uint16_t length;

+} xcb_setup_generic_t;

+

+static const int error_connection = 1;

+

+#ifdef _MSC_VER

+#undef close

+#define close(fd) closesocket(fd)

+

+size_t writev(int fildes, const struct iovec *iov, int iovcnt)

+{

+  int i, r;

+  char *p;

+  size_t l, sum;

+

+  /* We should buffer */

+  sum= 0;

+  for (i= 0; i<iovcnt; i++)

+  {

+    p= iov[i].iov_base;

+    l= iov[i].iov_len;

+    while (l > 0)

+    {

+      r= send(fildes, p, l, 0);

+      if (r <= 0)

+      {

+        errno =WSAGetLastError();

+        if(errno == WSAEWOULDBLOCK)

+          errno = EAGAIN;

+        if (sum)

+          return sum;

+        else

+          return r;

+      }

+      p += r;

+      l -= r;

+      sum += r;

+    }

+  }

+  return sum;

+}

+#endif

+

+static int set_fd_flags(const int fd)

+{

+#ifdef _MSC_VER

+    unsigned long arg = 1;

+    int ret = ioctlsocket (fd, FIONBIO, &arg);

+#else

+    int flags = fcntl(fd, F_GETFL, 0);

+    if(flags == -1)

+        return 0;

+    flags |= O_NONBLOCK;

+    if(fcntl(fd, F_SETFL, flags) == -1)

+        return 0;

+    if(fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)

+        return 0;

+#endif

+    return 1;

+}

+

+static int write_setup(xcb_connection_t *c, xcb_auth_info_t *auth_info)

+{

+    static const char pad[3];

+    xcb_setup_request_t out;

+    struct iovec parts[6];

+    int count = 0;

+    static const uint32_t endian = 0x01020304;

+    int ret;

+

+    memset(&out, 0, sizeof(out));

+

+    /* B = 0x42 = MSB first, l = 0x6c = LSB first */

+    if(htonl(endian) == endian)

+        out.byte_order = 0x42;

+    else

+        out.byte_order = 0x6c;

+    out.protocol_major_version = X_PROTOCOL;

+    out.protocol_minor_version = X_PROTOCOL_REVISION;

+    out.authorization_protocol_name_len = 0;

+    out.authorization_protocol_data_len = 0;

+    parts[count].iov_len = sizeof(xcb_setup_request_t);

+    parts[count++].iov_base = (caddr_t) &out;

+    parts[count].iov_len = XCB_PAD(sizeof(xcb_setup_request_t));

+    parts[count++].iov_base = (char *) pad;

+

+    if(auth_info)

+    {

+        parts[count].iov_len = out.authorization_protocol_name_len = auth_info->namelen;

+        parts[count++].iov_base = auth_info->name;

+        parts[count].iov_len = XCB_PAD(out.authorization_protocol_name_len);

+        parts[count++].iov_base = (char *) pad;

+        parts[count].iov_len = out.authorization_protocol_data_len = auth_info->datalen;

+        parts[count++].iov_base = auth_info->data;

+        parts[count].iov_len = XCB_PAD(out.authorization_protocol_data_len);

+        parts[count++].iov_base = (char *) pad;

+    }

+    assert(count <= (int) (sizeof(parts) / sizeof(*parts)));

+

+    pthread_mutex_lock(&c->iolock);

+    ret = _xcb_out_send(c, parts, count);

+    pthread_mutex_unlock(&c->iolock);

+    return ret;

+}

+

+static int read_setup(xcb_connection_t *c)

+{

+    /* Read the server response */

+    c->setup = malloc(sizeof(xcb_setup_generic_t));

+    if(!c->setup)

+        return 0;

+

+    if(_xcb_in_read_block(c, c->setup, sizeof(xcb_setup_generic_t)) != sizeof(xcb_setup_generic_t))

+        return 0;

+

+    {

+        void *tmp = realloc(c->setup, c->setup->length * 4 + sizeof(xcb_setup_generic_t));

+        if(!tmp)

+            return 0;

+        c->setup = tmp;

+    }

+

+    if(_xcb_in_read_block(c, (char *) c->setup + sizeof(xcb_setup_generic_t), c->setup->length * 4) <= 0)

+        return 0;

+

+    /* 0 = failed, 2 = authenticate, 1 = success */

+    switch(c->setup->status)

+    {

+    case 0: /* failed */

+        {

+            xcb_setup_failed_t *setup = (xcb_setup_failed_t *) c->setup;

+            write(STDERR_FILENO, xcb_setup_failed_reason(setup), xcb_setup_failed_reason_length(setup));

+            return 0;

+        }

+

+    case 2: /* authenticate */

+        {

+            xcb_setup_authenticate_t *setup = (xcb_setup_authenticate_t *) c->setup;

+            write(STDERR_FILENO, xcb_setup_authenticate_reason(setup), xcb_setup_authenticate_reason_length(setup));

+            return 0;

+        }

+    }

+

+    return 1;

+}

+

+/* precondition: there must be something for us to write. */

+static int write_vec(xcb_connection_t *c, struct iovec **vector, int *count)

+{

+    int n;

+    assert(!c->out.queue_len);

+    n = writev(c->fd, *vector, *count);

+    if(n < 0 && errno == EAGAIN)

+        return 1;

+    if(n <= 0)

+    {

+        _xcb_conn_shutdown(c);

+        return 0;

+    }

+

+    for(; *count; --*count, ++*vector)

+    {

+        int cur = (*vector)->iov_len;

+        if(cur > n)

+            cur = n;

+        (*vector)->iov_len -= cur;

+        (*vector)->iov_base = (char *) (*vector)->iov_base + cur;

+        n -= cur;

+        if((*vector)->iov_len)

+            break;

+    }

+    if(!*count)

+        *vector = 0;

+    assert(n == 0);

+    return 1;

+}

+

+/* Public interface */

+

+const xcb_setup_t *xcb_get_setup(xcb_connection_t *c)

+{

+    if(c->has_error)

+        return 0;

+    /* doesn't need locking because it's never written to. */

+    return c->setup;

+}

+

+int xcb_get_file_descriptor(xcb_connection_t *c)

+{

+    if(c->has_error)

+        return -1;

+    /* doesn't need locking because it's never written to. */

+    return c->fd;

+}

+

+int xcb_connection_has_error(xcb_connection_t *c)

+{

+    /* doesn't need locking because it's read and written atomically. */

+    return c->has_error;

+}

+

+xcb_connection_t *xcb_connect_to_fd(int fd, xcb_auth_info_t *auth_info)

+{

+    xcb_connection_t* c;

+

+    c = calloc(1, sizeof(xcb_connection_t));

+    if(!c) {

+        close(fd);

+        return (xcb_connection_t *) &error_connection;

+    }

+

+    c->fd = fd;

+

+    if(!(

+        set_fd_flags(fd) &&

+        pthread_mutex_init(&c->iolock, 0) == 0 &&

+        _xcb_in_init(&c->in) &&

+        _xcb_out_init(&c->out) &&

+        write_setup(c, auth_info) &&

+        read_setup(c) &&

+        _xcb_ext_init(c) &&

+        _xcb_xid_init(c)

+        ))

+    {

+        xcb_disconnect(c);

+        return (xcb_connection_t *) &error_connection;

+    }

+

+    return c;

+}

+

+void xcb_disconnect(xcb_connection_t *c)

+{

+    if(c->has_error)

+        return;

+

+    free(c->setup);

+    close(c->fd);

+

+    pthread_mutex_destroy(&c->iolock);

+    _xcb_in_destroy(&c->in);

+    _xcb_out_destroy(&c->out);

+

+    _xcb_ext_destroy(c);

+    _xcb_xid_destroy(c);

+

+    free(c);

+}

+

+/* Private interface */

+

+void _xcb_conn_shutdown(xcb_connection_t *c)

+{

+    c->has_error = 1;

+}

+

+int _xcb_conn_wait(xcb_connection_t *c, pthread_cond_t *cond, struct iovec **vector, int *count)

+{

+    int ret;

+#if USE_POLL

+    struct pollfd fd;

+#else

+    fd_set rfds, wfds;

+#endif

+

+    /* If the thing I should be doing is already being done, wait for it. */

+    if(count ? c->out.writing : c->in.reading)

+    {

+        pthread_cond_wait(cond, &c->iolock);

+        return 1;

+    }

+

+#if USE_POLL

+    memset(&fd, 0, sizeof(fd));

+    fd.fd = c->fd;

+    fd.events = POLLIN;

+#else

+    FD_ZERO(&rfds);

+    FD_SET(c->fd, &rfds);

+#endif

+    ++c->in.reading;

+

+#if USE_POLL

+    if(count)

+    {

+        fd.events |= POLLOUT;

+        ++c->out.writing;

+    }

+#else

+    FD_ZERO(&wfds);

+    if(count)

+    {

+        FD_SET(c->fd, &wfds);

+        ++c->out.writing;

+    }

+#endif

+

+    pthread_mutex_unlock(&c->iolock);

+    do {

+#if USE_POLL

+        ret = poll(&fd, 1, -1);

+#else

+        ret = select(c->fd + 1, &rfds, &wfds, 0, 0);

+	if (ret==SOCKET_ERROR)

+	{

+	   ret=-1;

+           errno = WSAGetLastError();

+	   if (errno == WSAEINTR)

+		   errno=EINTR;

+	}

+#endif

+    } while (ret == -1 && errno == EINTR);

+    if(ret < 0)

+    {

+        _xcb_conn_shutdown(c);

+        ret = 0;

+    }

+    pthread_mutex_lock(&c->iolock);

+

+    if(ret)

+    {

+#if USE_POLL

+        if((fd.revents & POLLIN) == POLLIN)

+#else

+        if(FD_ISSET(c->fd, &rfds))

+#endif

+            ret = ret && _xcb_in_read(c);

+

+#if USE_POLL

+        if((fd.revents & POLLOUT) == POLLOUT)

+#else

+        if(FD_ISSET(c->fd, &wfds))

+#endif

+            ret = ret && write_vec(c, vector, count);

+    }

+

+    if(count)

+        --c->out.writing;

+    --c->in.reading;

+

+    return ret;

+}