Merge branch 'master' of git+ssh://git.freedesktop.org/git/xcb

[free-sw/xcb/libxcb] / src / xcb_conn.c

diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index 0148abf..51f8eaa 100644 (file)
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -32,14 +32,30 @@
 #include <stdlib.h>
 #include <netinet/in.h>
 #include <sys/select.h>
+#include <sys/fcntl.h>
+#include <errno.h>
 
 #include "xcb.h"
 #include "xcbint.h"
 
+static int set_fd_flags(const int fd)
+{
+    long 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;
+    return 1;
+}
+
 static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info)
 {
+    static const char pad[3];
     XCBConnSetupReq out;
-    struct iovec parts[3];
+    struct iovec parts[6];
     int count = 0;
     int endian = 0x01020304;
     int ret;
@@ -57,22 +73,29 @@ static int write_setup(XCBConnection *c, XCBAuthInfo *auth_info)
     out.authorization_protocol_data_len = 0;
     parts[count].iov_len = sizeof(XCBConnSetupReq);
     parts[count++].iov_base = &out;
+    parts[count].iov_len = XCB_PAD(sizeof(XCBConnSetupReq));
+    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 <= sizeof(parts) / sizeof(*parts));
 
     pthread_mutex_lock(&c->iolock);
-    _xcb_out_write_block(c, parts, count);
-    ret = _xcb_out_flush(c);
+    {
+        struct iovec *parts_ptr = parts;
+        ret = _xcb_out_send(c, &parts_ptr, &count);
+    }
     pthread_mutex_unlock(&c->iolock);
-    if(ret <= 0)
-        return 0;
-    return 1;
+    return ret;
 }
 
 static int read_setup(XCBConnection *c)
@@ -82,7 +105,7 @@ static int read_setup(XCBConnection *c)
     if(!c->setup)
         return 0;
 
-    if(_xcb_read_block(c->fd, c->setup, sizeof(XCBConnSetupGenericRep)) != sizeof(XCBConnSetupGenericRep))
+    if(_xcb_in_read_block(c, c->setup, sizeof(XCBConnSetupGenericRep)) != sizeof(XCBConnSetupGenericRep))
         return 0;
 
     {
@@ -92,7 +115,7 @@ static int read_setup(XCBConnection *c)
         c->setup = tmp;
     }
 
-    if(_xcb_read_block(c->fd, (char *) c->setup + sizeof(XCBConnSetupGenericRep), c->setup->length * 4) <= 0)
+    if(_xcb_in_read_block(c, (char *) c->setup + sizeof(XCBConnSetupGenericRep), c->setup->length * 4) <= 0)
         return 0;
 
     /* 0 = failed, 2 = authenticate, 1 = success */
@@ -116,6 +139,34 @@ static int read_setup(XCBConnection *c)
     return 1;
 }
 
+/* precondition: there must be something for us to write. */
+static int write_vec(XCBConnection *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)
+        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 */
 
 XCBConnSetupSuccessRep *XCBGetSetup(XCBConnection *c)
@@ -141,7 +192,7 @@ XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
     c->fd = fd;
 
     if(!(
-        _xcb_set_fd_flags(fd) &&
+        set_fd_flags(fd) &&
         pthread_mutex_init(&c->iolock, 0) == 0 &&
         _xcb_in_init(&c->in) &&
         _xcb_out_init(&c->out) &&
@@ -178,26 +229,15 @@ void XCBDisconnect(XCBConnection *c)
 
 /* Private interface */
 
-int _xcb_conn_wait(XCBConnection *c, const int should_write, pthread_cond_t *cond)
+int _xcb_conn_wait(XCBConnection *c, pthread_cond_t *cond, struct iovec **vector, int *count)
 {
-    int ret = 1;
+    int ret;
     fd_set rfds, wfds;
-#if USE_THREAD_ASSERT
-    static __thread int already_here = 0;
-
-    assert(!already_here);
-    ++already_here;
-#endif
-
-    _xcb_assert_valid_sequence(c);
 
     /* If the thing I should be doing is already being done, wait for it. */
-    if(should_write ? c->out.writing : c->in.reading)
+    if(count ? c->out.writing : c->in.reading)
     {
         pthread_cond_wait(cond, &c->iolock);
-#if USE_THREAD_ASSERT
-        --already_here;
-#endif
         return 1;
     }
 
@@ -206,34 +246,28 @@ int _xcb_conn_wait(XCBConnection *c, const int should_write, pthread_cond_t *con
     ++c->in.reading;
 
     FD_ZERO(&wfds);
-    if(should_write)
+    if(count)
     {
         FD_SET(c->fd, &wfds);
         ++c->out.writing;
     }
 
     pthread_mutex_unlock(&c->iolock);
-    ret = select(c->fd + 1, &rfds, &wfds, 0, 0);
+    ret = select(c->fd + 1, &rfds, &wfds, 0, 0) > 0;
     pthread_mutex_lock(&c->iolock);
 
-    if(ret <= 0) /* error: select failed */
-        goto done;
-
-    if(FD_ISSET(c->fd, &rfds))
-        if((ret = _xcb_in_read(c)) <= 0)
-            goto done;
+    if(ret)
+    {
+        if(FD_ISSET(c->fd, &rfds))
+            ret = ret && _xcb_in_read(c);
 
-    if(FD_ISSET(c->fd, &wfds))
-        if((ret = _xcb_out_write(c)) <= 0)
-            goto done;
+        if(FD_ISSET(c->fd, &wfds))
+            ret = ret && write_vec(c, vector, count);
+    }
 
-done:
-    if(should_write)
+    if(count)
         --c->out.writing;
     --c->in.reading;
 
-#if USE_THREAD_ASSERT
-    --already_here;
-#endif
     return ret;
 }