X-Git-Url: http://git.demorecorder.com/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fxcb_out.c;h=1b68215a8c3d20d64fddba17bb19c6bdd8fcf2bd;hb=2c8b5994b3fbba343199ef555594a32e29d8bcee;hp=2494ef34d4f9c465319db7d60de147a0c1946390;hpb=5437032c7dee85da99b612a707fa94d012d40282;p=free-sw%2Fxcb%2Flibxcb

diff --git a/src/xcb_out.c b/src/xcb_out.c
index 2494ef3..1b68215 100644
--- a/src/xcb_out.c
+++ b/src/xcb_out.c
@@ -29,17 +29,38 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include <errno.h>
 
 #include "xcb.h"
 #include "xcbext.h"
 #include "xcbint.h"
 #include "extensions/bigreq.h"
 
+static int write_block(XCBConnection *c, struct iovec *vector, int count)
+{
+    while(count && c->out.queue_len + vector[0].iov_len <= sizeof(c->out.queue))
+    {
+        memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
+        c->out.queue_len += vector[0].iov_len;
+        vector[0].iov_base = (char *) vector[0].iov_base + vector[0].iov_len;
+        vector[0].iov_len = 0;
+        ++vector, --count;
+    }
+    if(!count)
+        return 1;
+
+    --vector, ++count;
+    vector[0].iov_base = c->out.queue;
+    vector[0].iov_len = c->out.queue_len;
+    c->out.queue_len = 0;
+    return _xcb_out_send(c, &vector, &count);
+}
+
 /* Public interface */
 
 CARD32 XCBGetMaximumRequestLength(XCBConnection *c)
 {
+    if(c->has_error)
+        return 0;
     pthread_mutex_lock(&c->out.reqlenlock);
     if(!c->out.maximum_request_length)
     {
@@ -72,6 +93,9 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
     int veclen = req->count;
     enum workarounds workaround = WORKAROUND_NONE;
 
+    if(c->has_error)
+        return 0;
+
     assert(c != 0);
     assert(vector != 0);
     assert(req->count > 0);
@@ -88,7 +112,10 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
         {
             const XCBQueryExtensionRep *extension = XCBGetExtensionData(c, req->ext);
             if(!(extension && extension->present))
+            {
+                _xcb_conn_shutdown(c);
                 return 0;
+            }
             ((CARD8 *) vector[0].iov_base)[0] = extension->major_opcode;
             ((CARD8 *) vector[0].iov_base)[1] = req->opcode;
         }
@@ -101,7 +128,7 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
             longlen += vector[i].iov_len;
             if(!vector[i].iov_base)
             {
-                vector[i].iov_base = (caddr_t) pad;
+                vector[i].iov_base = (char *) pad;
                 assert(vector[i].iov_len <= sizeof(pad));
             }
         }
@@ -115,7 +142,10 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
             longlen = 0;
         }
         else if(longlen > XCBGetMaximumRequestLength(c))
+        {
+            _xcb_conn_shutdown(c);
             return 0; /* server can't take this; maybe need BIGREQUESTS? */
+        }
 
         /* set the length field. */
         ((CARD16 *) vector[0].iov_base)[1] = shortlen;
@@ -125,8 +155,10 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
     flags &= ~XCB_REQUEST_RAW;
 
     /* do we need to work around the X server bug described in glx.xml? */
-    if(req->ext && !req->isvoid && strcmp(req->ext->name, "GLX") &&
-            ((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[0] == 0x10004) ||
+    /* XXX: GetFBConfigs won't use BIG-REQUESTS in any sane
+     * configuration, but that should be handled here anyway. */
+    if(req->ext && !req->isvoid && !strcmp(req->ext->name, "GLX") &&
+            ((req->opcode == 17 && ((CARD32 *) vector[0].iov_base)[1] == 0x10004) ||
              req->opcode == 21))
         workaround = WORKAROUND_GLX_GET_FB_CONFIGS_BUG;
 
@@ -136,17 +168,24 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
     while(c->out.writing)
         pthread_cond_wait(&c->out.cond, &c->iolock);
 
-    if(req->isvoid && c->out.request == c->in.request_expected + (1 << 16) - 2)
+    request = ++c->out.request;
+    /* send GetInputFocus (sync) when 64k-2 requests have been sent without
+     * a reply.
+     * Also send sync (could use NoOp) at 32-bit wrap to avoid having
+     * applications see sequence 0 as that is used to indicate
+     * an error in sending the request */
+    while((req->isvoid &&
+	c->out.request == c->in.request_expected + (1 << 16) - 1) ||
+       request == 0)
     {
         prefix[0] = sync.packet;
-        request = ++c->out.request;
         _xcb_in_expect_reply(c, request, WORKAROUND_NONE, XCB_REQUEST_DISCARD_REPLY);
         c->in.request_expected = c->out.request;
+	request = ++c->out.request;
     }
 
-    request = ++c->out.request;
-    assert(request != 0);
-    _xcb_in_expect_reply(c, request, workaround, flags);
+    if(workaround != WORKAROUND_NONE || flags != 0)
+        _xcb_in_expect_reply(c, request, workaround, flags);
     if(!req->isvoid)
         c->in.request_expected = c->out.request;
 
@@ -163,8 +202,11 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
         vector[0].iov_base = prefix + !prefix[0];
     }
 
-    if(!_xcb_out_write_block(c, vector, veclen))
+    if(!write_block(c, vector, veclen))
+    {
+        _xcb_conn_shutdown(c);
         request = 0;
+    }
     pthread_mutex_unlock(&c->iolock);
     return request;
 }
@@ -172,8 +214,10 @@ unsigned int XCBSendRequest(XCBConnection *c, int flags, struct iovec *vector, c
 int XCBFlush(XCBConnection *c)
 {
     int ret;
+    if(c->has_error)
+        return 0;
     pthread_mutex_lock(&c->iolock);
-    ret = _xcb_out_flush(c);
+    ret = _xcb_out_flush_to(c, c->out.request);
     pthread_mutex_unlock(&c->iolock);
     return ret;
 }
@@ -187,8 +231,6 @@ int _xcb_out_init(_xcb_out *out)
     out->writing = 0;
 
     out->queue_len = 0;
-    out->vec = 0;
-    out->vec_len = 0;
 
     out->request = 0;
     out->request_written = 0;
@@ -206,74 +248,32 @@ void _xcb_out_destroy(_xcb_out *out)
     pthread_mutex_destroy(&out->reqlenlock);
 }
 
-/* precondition: there must be something for us to write. */
-int _xcb_out_write(XCBConnection *c)
+int _xcb_out_send(XCBConnection *c, struct iovec **vector, int *count)
 {
-    int n;
-    assert(!c->out.queue_len);
-    n = writev(c->fd, c->out.vec, c->out.vec_len);
-    if(n < 0 && errno == EAGAIN)
-        return 1;
-    if(n <= 0)
-        return 0;
-
-    for(; c->out.vec_len; --c->out.vec_len, ++c->out.vec)
-    {
-        int cur = c->out.vec->iov_len;
-        if(cur > n)
-            cur = n;
-        c->out.vec->iov_len -= cur;
-        c->out.vec->iov_base = (char *) c->out.vec->iov_base + cur;
-        n -= cur;
-        if(c->out.vec->iov_len)
-            break;
-    }
-    if(!c->out.vec_len)
-        c->out.vec = 0;
-    assert(n == 0);
-    return 1;
+    int ret = 1;
+    while(ret && *count)
+        ret = _xcb_conn_wait(c, &c->out.cond, vector, count);
+    c->out.request_written = c->out.request;
+    pthread_cond_broadcast(&c->out.cond);
+    return ret;
 }
 
-int _xcb_out_write_block(XCBConnection *c, struct iovec *vector, size_t count)
+int _xcb_out_flush_to(XCBConnection *c, unsigned int request)
 {
-    assert(!c->out.vec && !c->out.vec_len);
-    while(count && c->out.queue_len + vector[0].iov_len < sizeof(c->out.queue))
-    {
-        memcpy(c->out.queue + c->out.queue_len, vector[0].iov_base, vector[0].iov_len);
-        c->out.queue_len += vector[0].iov_len;
-        vector[0].iov_base = (char *) vector[0].iov_base + vector[0].iov_len;
-        vector[0].iov_len = 0;
-        ++vector, --count;
-    }
-    if(!count)
+    assert(XCB_SEQUENCE_COMPARE(request, <=, c->out.request));
+    if(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request))
         return 1;
-
-    --vector, ++count;
-    vector[0].iov_base = c->out.queue;
-    vector[0].iov_len = c->out.queue_len;
-    c->out.queue_len = 0;
-
-    c->out.vec_len = count;
-    c->out.vec = vector;
-    return _xcb_out_flush(c);
-}
-
-int _xcb_out_flush(XCBConnection *c)
-{
-    int ret = 1;
-    struct iovec vec;
     if(c->out.queue_len)
     {
-        assert(!c->out.vec && !c->out.vec_len);
+        struct iovec vec, *vec_ptr = &vec;
+        int count = 1;
         vec.iov_base = c->out.queue;
         vec.iov_len = c->out.queue_len;
-        c->out.vec = &vec;
-        c->out.vec_len = 1;
         c->out.queue_len = 0;
+        return _xcb_out_send(c, &vec_ptr, &count);
     }
-    while(ret && c->out.vec_len)
-        ret = _xcb_conn_wait(c, /*should_write*/ 1, &c->out.cond);
-    c->out.request_written = c->out.request;
-    pthread_cond_broadcast(&c->out.cond);
-    return ret;
+    while(c->out.writing)
+        pthread_cond_wait(&c->out.cond, &c->iolock);
+    assert(XCB_SEQUENCE_COMPARE(c->out.request_written, >=, request));
+    return 1;
 }