Merge remote-tracking branch 'origin/released'

Conflicts:
	xorg-server/os/connection.c

1 files changed, 51 insertions, 22 deletions

diff --git a/xorg-server/os/connection.c b/xorg-server/os/connection.c
index 53a6ca005..1685292ce 100644
--- a/xorg-server/os/connection.c
+++ b/xorg-server/os/connection.c
@@ -152,6 +152,7 @@ static Pid_t ParentProcess;
 #endif
 Bool RunFromSigStopParent;      /* send SIGSTOP to our own process; Upstart (or
                                    equivalent) will send SIGCONT back. */
+static char dynamic_display[7]; /* display name */
 Bool PartialNetwork;            /* continue even if unable to bind all addrs */
 
 static Bool debug_conns = FALSE;
@@ -376,6 +377,10 @@ void
 NotifyParentProcess(void)
 {
 #if !defined(WIN32)
+    if (dynamic_display[0]) {
+        write(displayfd, dynamic_display, strlen(dynamic_display));
+        close(displayfd);
+    }
     if (RunFromSmartParent) {
         if (ParentProcess > 1) {
             kill(ParentProcess, SIGUSR1);
@@ -386,6 +391,18 @@ NotifyParentProcess(void)
 #endif
 }
 
+static Bool
+TryCreateSocket(int num, int *partial)
+{
+    char port[20];
+
+    snprintf(port, sizeof(port), "%d", num);
+
+    return (_XSERVTransMakeAllCOTSServerListeners(port, partial,
+                                                  &ListenTransCount,
+                                                  &ListenTransConns) >= 0);
+}
+
 /*****************
  * CreateWellKnownSockets
  *    At initialization, create the sockets to listen on for new clients.
@@ -396,7 +413,6 @@ CreateWellKnownSockets(void)
 {
     int i;
     int partial;
-    char port[20];
 
     FD_ZERO(&AllSockets);
     FD_ZERO(&AllClients);
@@ -412,31 +428,44 @@ CreateWellKnownSockets(void)
 
     FD_ZERO(&WellKnownConnections);
 
-    snprintf(port, sizeof(port), "%d", atoi(display));
-
-    if ((_XSERVTransMakeAllCOTSServerListeners(port, &partial,
-                                               &ListenTransCount,
-                                               &ListenTransConns) >= 0) &&
-                                               (ListenTransCount >= 1)) {
-        if (!PartialNetwork && partial) {
-            FatalError("Failed to establish all listening sockets");
+    /* display is initialized to "0" by main(). It is then set to the display
+     * number if specified on the command line, or to NULL when the -displayfd
+     * option is used. */
+    if (display) {
+        if (TryCreateSocket(atoi(display), &partial) &&
+            ListenTransCount >= 1)
+            if (!PartialNetwork && partial)
+                FatalError ("Failed to establish all listening sockets");
+    }
+    else { /* -displayfd */
+        Bool found = 0;
+        for (i = 0; i < 65535 - X_TCP_PORT; i++) {
+            if (TryCreateSocket(i, &partial) && !partial) {
+                found = 1;
+                break;
+            }
+            else
+                CloseWellKnownConnections();
         }
-        else {
-            ListenTransFds = malloc(ListenTransCount * sizeof(int));
+        if (!found)
+            FatalError("Failed to find a socket to listen on");
+        snprintf(dynamic_display, sizeof(dynamic_display), "%d", i);
+        display = dynamic_display;
+    }
 
-            for (i = ListenTransCount; i > 0; i--) {
-                int fd = _XSERVTransGetConnectionNumber (ListenTransConns[i-1]);
+    ListenTransFds = malloc(ListenTransCount * sizeof (int));
 
-                ListenTransFds[i-1] = fd;
-                FD_SET(fd, &WellKnownConnections);
+    for (i = ListenTransCount; i > 0; i--) {
+        int fd = _XSERVTransGetConnectionNumber (ListenTransConns[i-1]);
 
-                if (!_XSERVTransIsLocal (ListenTransConns[i-1])) {
-                    int protocol = 0;
-                    if (!strcmp("inet", ListenTransConns[i-1]->transptr->TransName)) protocol = 4;
-                    else if (!strcmp("inet6", ListenTransConns[i-1]->transptr->TransName)) protocol = 6;
-                    DefineSelf (fd, protocol);
-                }
-            }
+        ListenTransFds[i-1] = fd;
+        FD_SET(fd, &WellKnownConnections);
+
+        if (!_XSERVTransIsLocal (ListenTransConns[i-1])) {
+            int protocol = 0;
+            if (!strcmp("inet", ListenTransConns[i-1]->transptr->TransName)) protocol = 4;
+            else if (!strcmp("inet6", ListenTransConns[i-1]->transptr->TransName)) protocol = 6;
+            DefineSelf (fd, protocol);
         }
     }