diff options
| -rw-r--r-- | dix/globals.c | 1 | ||||
| -rw-r--r-- | include/opaque.h | 1 | ||||
| -rw-r--r-- | man/Xserver.man | 7 | ||||
| -rw-r--r-- | os/connection.c | 68 | ||||
| -rw-r--r-- | os/utils.c | 9 |
5 files changed, 66 insertions, 20 deletions
diff --git a/dix/globals.c b/dix/globals.c index a564575f3..332b91f5c 100644 --- a/dix/globals.c +++ b/dix/globals.c @@ -128,6 +128,7 @@ int defaultColorVisualClass = -1; int monitorResolution = 0; char *display; +int displayfd; char *ConnectionInfo; CARD32 TimeOutValue = DEFAULT_TIMEOUT * MILLI_PER_SECOND; diff --git a/include/opaque.h b/include/opaque.h index 9ca408ae1..b76ab6e6b 100644 --- a/include/opaque.h +++ b/include/opaque.h @@ -50,6 +50,7 @@ extern _X_EXPORT int ScreenSaverAllowExposures; extern _X_EXPORT int defaultScreenSaverBlanking; extern _X_EXPORT int defaultScreenSaverAllowExposures; extern _X_EXPORT char *display; +extern _X_EXPORT int displayfd; extern _X_EXPORT int defaultBackingStore; extern _X_EXPORT Bool disableBackingStore; diff --git a/man/Xserver.man b/man/Xserver.man index 0cd9b941c..8d243d6b7 100644 --- a/man/Xserver.man +++ b/man/Xserver.man @@ -127,6 +127,13 @@ Not obeyed by all servers. .B \-core causes the server to generate a core dump on fatal errors. .TP 8 +.B \-displayfd \fIfd\fP +specifies a file descriptor in the launching process. Rather than specify +a display number, the X server will attempt to listen on successively higher +display numbers, and upon finding a free one, will write the port number back +on this file descriptor as a newline-terminated string. The \-pn option is +ignored when using \-displayfd. +.TP 8 .B \-deferglyphs \fIwhichfonts\fP specifies the types of fonts for which the server should attempt to use deferred glyph loading. \fIwhichfonts\fP can be all (all fonts), diff --git a/os/connection.c b/os/connection.c index 1099752e4..039942f91 100644 --- a/os/connection.c +++ b/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/os/utils.c b/os/utils.c index 30592d2cc..3a1ef9303 100644 --- a/os/utils.c +++ b/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 */ ; |