3 files changed, 73 insertions, 22 deletions

diff --git a/xorg-server/os/WaitFor.c b/xorg-server/os/WaitFor.c
index 95e64ba45..393890f19 100644
--- a/xorg-server/os/WaitFor.c
+++ b/xorg-server/os/WaitFor.c
@@ -382,6 +382,7 @@ CheckAllTimers(void)
     OsTimerPtr timer;
     CARD32 now;
 
+    OsBlockSignals();
  start:
     now = GetTimeInMillis();
 
@@ -391,6 +392,7 @@ CheckAllTimers(void)
             goto start;
         }
     }
+    OsReleaseSignals();
 }
 
 static void
@@ -398,11 +400,13 @@ DoTimer(OsTimerPtr timer, CARD32 now, OsTimerPtr *prev)
 {
     CARD32 newTime;
 
+    OsBlockSignals();
     *prev = timer->next;
     timer->next = NULL;
     newTime = (*timer->callback) (timer, now, timer->arg);
     if (newTime)
         TimerSet(timer, 0, newTime, timer->callback, timer->arg);
+    OsReleaseSignals();
 }
 
 OsTimerPtr
@@ -418,6 +422,7 @@ TimerSet(OsTimerPtr timer, int flags, CARD32 millis,
             return NULL;
     }
     else {
+        OsBlockSignals();
         for (prev = &timers; *prev; prev = &(*prev)->next) {
             if (*prev == timer) {
                 *prev = timer->next;
@@ -426,6 +431,7 @@ TimerSet(OsTimerPtr timer, int flags, CARD32 millis,
                 break;
             }
         }
+        OsReleaseSignals();
     }
     if (!millis)
         return timer;
@@ -445,26 +451,32 @@ TimerSet(OsTimerPtr timer, int flags, CARD32 millis,
         if (!millis)
             return timer;
     }
+    OsBlockSignals();
     for (prev = &timers;
          *prev && (int) ((*prev)->expires - millis) <= 0;
          prev = &(*prev)->next);
     timer->next = *prev;
     *prev = timer;
+    OsReleaseSignals();
     return timer;
 }
 
 Bool
 TimerForce(OsTimerPtr timer)
 {
+    int rc = FALSE;
     OsTimerPtr *prev;
 
+    OsBlockSignals();
     for (prev = &timers; *prev; prev = &(*prev)->next) {
         if (*prev == timer) {
             DoTimer(timer, GetTimeInMillis(), prev);
-            return TRUE;
+            rc = TRUE;
+            break;
         }
     }
-    return FALSE;
+    OsReleaseSignals();
+    return rc;
 }
 
 void
@@ -474,12 +486,14 @@ TimerCancel(OsTimerPtr timer)
 
     if (!timer)
         return;
+    OsBlockSignals();
     for (prev = &timers; *prev; prev = &(*prev)->next) {
         if (*prev == timer) {
             *prev = timer->next;
             break;
         }
     }
+    OsReleaseSignals();
 }
 
 void
diff --git a/xorg-server/os/connection.c b/xorg-server/os/connection.c
index 1099752e4..039942f91 100644
--- a/xorg-server/os/connection.c
+++ b/xorg-server/os/connection.c
@@ -142,6 +142,7 @@ Bool AnyClientsWriteBlocked;    /* true if some client blocked on write */
 static Bool RunFromSmartParent; /* send SIGUSR1 to parent process */
 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 Pid_t ParentProcess;
 
@@ -350,6 +351,10 @@ 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);
@@ -360,6 +365,18 @@ 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.
@@ -370,7 +387,6 @@ CreateWellKnownSockets(void)
 {
     int i;
     int partial;
-    char port[20];
 
     FD_ZERO(&AllSockets);
     FD_ZERO(&AllClients);
@@ -386,29 +402,41 @@ 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 = 0; i < ListenTransCount; i++) {
-                int fd = _XSERVTransGetConnectionNumber(ListenTransConns[i]);
+    ListenTransFds = malloc(ListenTransCount * sizeof (int));
 
-                ListenTransFds[i] = fd;
-                FD_SET(fd, &WellKnownConnections);
+    for (i = 0; i < ListenTransCount; i++) {
+        int fd = _XSERVTransGetConnectionNumber(ListenTransConns[i]);
 
-                if (!_XSERVTransIsLocal(ListenTransConns[i])) {
-                    DefineSelf(fd);
-                }
-            }
-        }
+        ListenTransFds[i] = fd;
+        FD_SET(fd, &WellKnownConnections);
+
+        if (!_XSERVTransIsLocal(ListenTransConns[i]))
+            DefineSelf (fd);
     }
 
     if (!XFD_ANYSET(&WellKnownConnections))
diff --git a/xorg-server/os/utils.c b/xorg-server/os/utils.c
index 30592d2cc..3a1ef9303 100644
--- a/xorg-server/os/utils.c
+++ b/xorg-server/os/utils.c
@@ -659,6 +659,15 @@ ProcessCommandLine(int argc, char *argv[])
             else
                 UseMsg();
         }
+        else if (strcmp(argv[i], "-displayfd") == 0) {
+            if (++i < argc) {
+                displayfd = atoi(argv[i]);
+                display = NULL;
+                nolock = TRUE;
+            }
+            else
+                UseMsg();
+        }
 #ifdef DPMSExtension
         else if (strcmp(argv[i], "dpms") == 0)
             /* ignored for compatibility */ ;