xfree86: man: add -syslogverbse flag

Document the newly added -syslogverbose command line flag.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

Xext/shm.c

@@ -46,6 +46,7 @@ in this Software without prior written authorization from The Open Group.
 #include "os/auth.h"
 #include "os/busfault.h"
 #include "os/client_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "misc.h"

Xext/vidmode.c

@@ -36,6 +36,9 @@ from Kaleb S. KEITHLEY
 #include <X11/X.h>
 #include <X11/Xproto.h>
 #include <X11/extensions/xf86vmproto.h>
+
+#include "os/log_priv.h"
+
 #include "misc.h"
 #include "dixstruct.h"
 #include "extnsionst.h"

Xi/exevents.c

@@ -97,6 +97,7 @@ SOFTWARE.
 #include "dix/exevents_priv.h"
 #include "dix/input_priv.h"
 #include "mi/mi_priv.h"
+#include "os/log_priv.h"
 
 #include "inputstr.h"
 #include "windowstr.h"

config/dbus-core.c

@@ -28,6 +28,8 @@
 #include <dbus/dbus.h>
 #include <sys/select.h>
 
+#include "os/log_priv.h"
+
 #include "dix.h"
 #include "os.h"
 

dix/devices.c

@@ -62,6 +62,7 @@ SOFTWARE.
 #include "dix/ptrveloc_priv.h"
 #include "mi/mi_priv.h"
 #include "os/bug_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "xkb/xkbsrv_priv.h"
 

dix/dixfonts.c

@@ -60,6 +60,7 @@ Equipment Corporation.
 #include "dix/dix_priv.h"
 #include "dix/gc_priv.h"
 #include "os/auth.h"
+#include "os/log_priv.h"
 
 #include "scrnintstr.h"
 #include "resource.h"

dix/events.c

@@ -127,6 +127,7 @@ Equipment Corporation.
 #include "os/bug_priv.h"
 #include "os/client_priv.h"
 #include "os/fmt.h"
+#include "os/log_priv.h"
 #include "xkb/xkbsrv_priv.h"
 
 #include "misc.h"

dix/touch.c

@@ -33,6 +33,7 @@
 #include "dix/input_priv.h"
 #include "mi/mi_priv.h"
 #include "os/bug_priv.h"
+#include "os/log_priv.h"
 
 #include "inputstr.h"
 #include "scrnintstr.h"

hw/kdrive/ephyr/ephyrinit.c

@@ -28,6 +28,7 @@
 #include "dix/dix_priv.h"
 #include "os/cmdline.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "ephyr.h"
@@ -288,10 +289,8 @@ ddxProcessArgument(int argc, char **argv, int i)
     }
     else if (!strcmp(argv[i], "-verbosity")) {
         if (i + 1 < argc && argv[i + 1][0] != '-') {
-            int verbosity = atoi(argv[i + 1]);
-
-            LogSetParameter(XLOG_VERBOSITY, verbosity);
-            EPHYR_LOG("set verbosiry to %d\n", verbosity);
+            logVerbosity = atoi(argv[i + 1]);
+            EPHYR_LOG("set verbosiry to %d\n", logVerbosity);
             return 2;
         }
         else {

hw/xfree86/common/xf86Config.c

@@ -50,6 +50,7 @@
 #include <sys/types.h>
 #include <grp.h>
 
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "xf86.h"
@@ -827,13 +828,11 @@ configServerFlags(XF86ConfFlagsPtr flagsconf, XF86OptionPtr layoutopts)
     {
         if ((s = xf86GetOptValString(FlagOptions, FLAG_LOG))) {
             if (!xf86NameCmp(s, "flush")) {
-                LogMessageVerb(X_CONFIG, 1, "Flushing logfile enabled\n");
-                LogSetParameter(XLOG_FLUSH, TRUE);
+                LogMessageVerb(X_CONFIG, 1, "flush log flag is noop\n");
             }
             else if (!xf86NameCmp(s, "sync")) {
                 LogMessageVerb(X_CONFIG, 1, "Syncing logfile enabled\n");
-                LogSetParameter(XLOG_FLUSH, TRUE);
-                LogSetParameter(XLOG_SYNC, TRUE);
+                logSync = TRUE;
             }
             else {
                 LogMessageVerb(X_WARNING, 1, "Unknown Log option\n");

hw/xfree86/common/xf86Events.c

@@ -64,6 +64,7 @@
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
 #include "mi/mi_priv.h"
+#include "os/log_priv.h"
 
 #include "misc.h"
 #include "xf86.h"

hw/xfree86/common/xf86Helper.c

@@ -44,6 +44,7 @@
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
 #include "mi/mi_priv.h"
+#include "os/log_priv.h"
 
 #include "os.h"
 #include "servermd.h"

hw/xfree86/common/xf86Init.c

@@ -58,6 +58,7 @@
 #include "mi/mi_priv.h"
 #include "os/cmdline.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "servermd.h"
@@ -870,14 +871,14 @@ void
 xf86SetVerbosity(int verb)
 {
     xf86Verbose = verb;
-    LogSetParameter(XLOG_VERBOSITY, verb);
+    logVerbosity = verb;
 }
 
 void
 xf86SetLogVerbosity(int verb)
 {
     xf86LogVerbose = verb;
-    LogSetParameter(XLOG_FILE_VERBOSITY, verb);
+    logFileVerbosity = verb;
 }
 
 static void

hw/xfree86/common/xf86Mode.c

@@ -85,6 +85,9 @@
 #endif
 
 #include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "xf86Modes.h"
 #include "xf86Crtc.h"
 #include "os.h"

hw/xfree86/common/xf86VidMode.c

@@ -39,6 +39,9 @@
 #endif
 
 #include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "os.h"
 #include "xf86.h"
 #include "xf86Priv.h"

hw/xfree86/common/xf86fbman.c

@@ -30,18 +30,17 @@
 #include <xorg-config.h>
 #endif
 
+#include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "misc.h"
 #include "xf86.h"
 
-#include <X11/X.h>
 #include "scrnintstr.h"
 #include "regionstr.h"
 #include "xf86fbman.h"
 
-/*
-#define DEBUG
-*/
-
 static DevPrivateKeyRec xf86FBManagerKeyRec;
 static DevPrivateKey xf86FBManagerKey;
 

hw/xfree86/common/xf86pciBus.c

@@ -35,8 +35,11 @@
 #include <ctype.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <X11/X.h>
 #include <pciaccess.h>
+#include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "os.h"
 #include "Pci.h"
 #include "xf86.h"

hw/xfree86/int10/vbeModes.c

@@ -36,6 +36,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "os/log_priv.h"
+
 #include "xf86.h"
 #include "vbe.h"
 #include "vbeModes.h"

hw/xfree86/man/Xorg.man

@@ -293,6 +293,15 @@ file verbosity level.  When the
 value is supplied, the log file verbosity level is set to that value.
 The default log file verbosity level is 3.
 .TP 8
+.BR \-syslogverbose " [\fIn\fP]"
+Sets the verbosity level for information printed to syslog. If the
+.I n
+value isn't supplied, each occurrence of this option increments the log
+file verbosity level.  When the
+.I n
+value is supplied, the log file verbosity level is set to that value.
+The default log file verbosity level is 0 (silent).
+.TP 8
 .BI \-modulepath " searchpath"
 Set the module search path to
 .IR searchpath .

hw/xfree86/os-support/linux/lnx_acpi.c

@@ -10,6 +10,8 @@
 #include <fcntl.h>
 #include <errno.h>
 
+#include "os/log_priv.h"
+
 #include "os.h"
 #include "xf86.h"
 #include "xf86Priv.h"

hw/xfree86/os-support/linux/lnx_apm.c

@@ -4,6 +4,9 @@
 #endif
 
 #include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "os.h"
 #include "xf86.h"
 #include "xf86Priv.h"

hw/xfree86/os-support/shared/posix_tty.c

@@ -59,6 +59,7 @@
 #include <errno.h>
 #include <X11/X.h>
 
+#include "os/log_priv.h"
 #include "os/xserver_poll.h"
 
 #include "xf86.h"

hw/xfree86/vgahw/vgaHW.c

@@ -16,6 +16,9 @@
 #include <unistd.h>
 
 #include <X11/X.h>
+
+#include "os/log_priv.h"
+
 #include "misc.h"
 
 #include "xf86.h"

hw/xnest/Init.c

@@ -23,6 +23,7 @@ is" without express or implied warranty.
 #include "dix/screenint_priv.h"
 #include "mi/mi_priv.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "screenint.h"

hw/xquartz/darwin.c

@@ -35,6 +35,7 @@
 #include <X11/Xproto.h>
 
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "os.h"

hw/xwayland/xwayland-dmabuf.c

@@ -30,6 +30,8 @@
 #include <drm_fourcc.h>
 #include <wayland-util.h>
 
+#include "os/log_priv.h"
+
 #include "xwayland-dmabuf.h"
 #include "xwayland-glamor-gbm.h"
 #include "xwayland-screen.h"

hw/xwayland/xwayland-input.c

@@ -35,6 +35,7 @@
 #include "mi/mi_priv.h"
 #include "mi/mipointer_priv.h"
 #include "os/bug_priv.h"
+#include "os/log_priv.h"
 
 #include <inputstr.h>
 #include <xkbsrv.h>

hw/xwayland/xwayland-output.c

@@ -32,6 +32,7 @@
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
 #include "randr/randrstr_priv.h"
+#include "os/log_priv.h"
 
 #include "xwayland-cvt.h"
 #include "xwayland-output.h"

hw/xwayland/xwayland-screen.c

@@ -40,6 +40,7 @@
 #include "dix/input_priv.h"
 #include "dix/property_priv.h"
 #include "os/client_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "os/xserver_poll.h"
 

hw/xwayland/xwayland-window.c

@@ -34,6 +34,7 @@
 
 #include "dix/dix_priv.h"
 #include "dix/property_priv.h"
+#include "os/log_priv.h"
 
 #include "compositeext.h"
 #include "compint.h"

hw/xwayland/xwayland-xtest.c

@@ -33,6 +33,7 @@
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
 #include "os/client_priv.h"
+#include "os/log_priv.h"
 
 #include <inputstr.h>
 #include <inpututils.h>

hw/xwayland/xwayland.c

@@ -41,6 +41,7 @@
 #include "os/client_priv.h"
 #include "os/ddx_priv.h"
 #include "os/fmt.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "os/xserver_poll.h"
 
@@ -134,7 +135,6 @@ static int init_fd = -1;
 static int wm_fd = -1;
 static int listen_fds[5] = { -1, -1, -1, -1, -1 };
 static int listen_fd_count = 0;
-static int verbosity = 0;
 
 static void
 xwl_show_version(void)
@@ -237,12 +237,11 @@ ddxProcessArgument(int argc, char *argv[], int i)
 
             val = strtol(argv[i], &end, 0);
             if (*end == '\0') {
-                verbosity = val;
-                LogSetParameter(XLOG_VERBOSITY, verbosity);
+                logVerbosity = val;
                 return 2;
             }
         }
-        LogSetParameter(XLOG_VERBOSITY, ++verbosity);
+        logVerbosity++;
         return 1;
     }
     else if (strcmp(argv[i], "-version") == 0) {

hw/xwin/InitOutput.c

@@ -37,6 +37,7 @@ from The Open Group.
 #include "dix/dix_priv.h"
 #include "dix/screenint_priv.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "winmsg.h"
@@ -643,9 +644,8 @@ OsVendorInit(void)
         g_pszLogFile = LogInit(g_pszLogFile, ".old");
 
     }
-    LogSetParameter(XLOG_FLUSH, 1);
-    LogSetParameter(XLOG_VERBOSITY, g_iLogVerbose);
-    LogSetParameter(XLOG_FILE_VERBOSITY, g_iLogVerbose);
+    logVerbosity = 2;
+    logFileVerbosity = 2;
 
     /* Log the version information */
     if (serverGeneration == 1)

hw/xwin/glx/indirect.c

@@ -78,6 +78,8 @@
 #include <xwin-config.h>
 #endif
 
+#include "os/log_priv.h"
+
 #include "glwindows.h"
 #include <glx/glxserver.h>
 #include <glx/glxutil.h>
@@ -297,7 +299,7 @@ fbConfigsDump(unsigned int n, __GLXconfig * c, PixelFormatRejectStats *rejects)
     LogMessage(X_INFO, "ignored pixel formats: %d not OpenGL, %d unknown pixel type, %d unaccelerated\n",
                rejects->notOpenGL, rejects->unknownPixelType, rejects->unaccelerated);
 
-    if (g_iLogVerbose < 3)
+    if (logVerbosity < 3)
         return;
 
     ErrorF
@@ -572,7 +574,7 @@ glxWinScreenProbe(ScreenPtr pScreen)
     if (!wgl_extensions)
         wgl_extensions = "";
 
-    if (g_iLogVerbose >= 3) {
+    if (logVerbosity >= 3) {
         glxLogExtensions("GL_EXTENSIONS:  ", gl_extensions);
         glxLogExtensions("WGL_EXTENSIONS: ", wgl_extensions);
     }

hw/xwin/meson.build

@@ -109,7 +109,7 @@ srcs_windows += [
 
 rsrc = windows.compile_resources(
      'XWin.rc',
-     include_directories: include_directories('../../include/'),
+     include_directories: include_directories('../../include/', '../..'),
      depend_files: ['XWin.exe.manifest', 'X.ico'],
 )
 srcs_windows += rsrc

hw/xwin/winerror.c

@@ -32,6 +32,7 @@
 #include <xwin-config.h>
 #endif
 
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include <../xfree86/common/xorgVersion.h>

hw/xwin/winglobals.c

@@ -69,7 +69,6 @@ const char *g_pszLogFile = DEFAULT_LOGDIR "/XWin.%s.log";
 const char *g_pszLogFile = "XWin.log";
 Bool g_fLogFileChanged = FALSE;
 #endif
-int g_iLogVerbose = 2;
 Bool g_fLogInited = FALSE;
 char *g_pszCommandLine = NULL;
 Bool g_fSilentFatalError = FALSE;

hw/xwin/winglobals.h

@@ -45,7 +45,6 @@ extern const char *g_pszLogFile;
 #ifdef RELOCATE_PROJECTROOT
 extern Bool g_fLogFileChanged;
 #endif
-extern int g_iLogVerbose;
 extern Bool g_fLogInited;
 
 extern Bool g_fAuthEnabled;

hw/xwin/winprocarg.c

@@ -36,8 +36,9 @@ from The Open Group.
 #endif
 
 #include "os/cmdline.h"
-#include "os/osdep.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
+#include "os/osdep.h"
 
 #include <../xfree86/common/xorgVersion.h>
 #include "win.h"
@@ -996,7 +997,7 @@ ddxProcessArgument(int argc, char *argv[], int i)
      */
     if (IS_OPTION("-logverbose")) {
         CHECK_ARGS(1);
-        g_iLogVerbose = atoi(argv[++i]);
+        logVerbosity = atoi(argv[++i]);
         return 2;
     }
 

include/meson.build

@@ -333,15 +333,6 @@ conf_data.set('WSCONS_SUPPORT', supports_wscons ? '1' : false)
 conf_data.set('XSERVER_LIBPCIACCESS', get_option('pciaccess') ? '1' : false)
 conf_data.set('XSERVER_PLATFORM_BUS', build_udev_kms ? '1' : false)
 
-configure_file(output : 'dix-config.h',
-               configuration : conf_data)
-
-configure_file(output : 'xorg-server.h',
-               input : 'xorg-server.h.meson.in',
-               configuration : conf_data,
-               install: build_xorg,
-               install_dir: xorgsdkdir)
-
 version_data = configuration_data()
 version_data.set('VENDOR_RELEASE', '@0@'.format(release))
 version_data.set_quoted('VENDOR_NAME', get_option('vendor_name'))

include/os.h

@@ -280,14 +280,6 @@ extern _X_EXPORT int
 timingsafe_memcmp(const void *b1, const void *b2, size_t len);
 #endif
 
-/* Logging. */
-typedef enum _LogParameter {
-    XLOG_FLUSH,
-    XLOG_SYNC,
-    XLOG_VERBOSITY,
-    XLOG_FILE_VERBOSITY
-} LogParameter;
-
 /* Flags for log messages. */
 typedef enum {
     X_PROBED,                   /* Value was probed */
@@ -304,14 +296,6 @@ typedef enum {
     X_UNKNOWN = -1              /* unknown -- this must always be last */
 } MessageType;
 
-extern _X_EXPORT const char *
-LogInit(const char *fname, const char *backup);
-extern void
-LogSetDisplay(void);
-extern _X_EXPORT void
-LogClose(enum ExitCode error);
-extern _X_EXPORT Bool
-LogSetParameter(LogParameter param, int value);
 extern _X_EXPORT void
 LogVMessageVerb(MessageType type, int verb, const char *format, va_list args)
 _X_ATTRIBUTE_PRINTF(3, 0);
@@ -322,7 +306,7 @@ extern _X_EXPORT void
 LogMessage(MessageType type, const char *format, ...)
 _X_ATTRIBUTE_PRINTF(2, 3);
 
-extern _X_EXPORT void
+void
 LogVHdrMessageVerb(MessageType type, int verb,
                    const char *msg_format, va_list msg_args,
                    const char *hdr_format, va_list hdr_args)
@@ -340,17 +324,11 @@ FatalError(const char *f, ...)
 _X_ATTRIBUTE_PRINTF(1, 2)
     _X_NORETURN;
 
-#ifdef DEBUG
-#define DebugF ErrorF
-#else
-#define DebugF(...)             /* */
-#endif
-
 extern _X_EXPORT void
 ErrorF(const char *f, ...)
 _X_ATTRIBUTE_PRINTF(1, 2);
-extern _X_EXPORT void
-LogPrintMarkers(void);
+
+void LogPrintMarkers(void);
 
 extern _X_EXPORT void
 xorg_backtrace(void);

meson.build

@@ -924,3 +924,14 @@ if build_docs or build_docs_devel
         configuration: docxmlconfig
     )
 endif
+
+# finally write config files. doing that very late, so other subdirs still
+# have a change to add config items
+configure_file(output : 'dix-config.h',
+               configuration : conf_data)
+
+configure_file(output : 'xorg-server.h',
+               input : 'include/xorg-server.h.meson.in',
+               configuration : conf_data,
+               install: build_xorg,
+               install_dir: xorgsdkdir)

os/client.c

@@ -87,6 +87,7 @@
 #endif
 
 #include "os/auth.h"
+#include "os/log_priv.h"
 
 /**
  * Try to determine a PID for a client from its connection

os/cmdline.c

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: MIT OR X11
+ *
+ * Copyright © 2024 Enrico Weigelt, metux IT consult <info@metux.net>
+ *
+ * @brief command line helper functions
+ */
+
+#include <dix-config.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "os/cmdline.h"
+
+int ProcessCmdLineMultiInt(int argc, char *argv[], int *idx, const char* name, int *value)
+{
+    if (strcmp(argv[*idx], name))
+        return 0;
+
+    int i2 = *idx+1;
+    if (i2 < argc && argv[i2]) {
+        char *end;
+        long val = strtol(argv[i2], &end, 0);
+        if (*end == '\0') {
+            (*idx)++;
+            (*value) = val;
+            return 1;
+        }
+    }
+    (*value)++;
+    return 1;
+}

os/cmdline.h

@@ -17,4 +17,19 @@ void UseMsg(void);
 void ProcessCommandLine(int argc, char * argv[]);
 void CheckUserParameters(int argc, char **argv, char **envp);
 
+/*
+ * @brief check for and parse an counting-flag or value-flag option
+ *
+ * Parses an option that may either be used for setting an integer value or
+ * given one or multiple times (without argument) to increase an value
+ *
+ * @param argc total number of elements in argv
+ * @param argv array of pointers to cmdline argument strings
+ * @param idx pointer to current index in argv -- eventually will be modified
+ * @param name the command line argument name
+ * @param value pointer to the field holding the setting value
+ * @return non-zero if the flag was found and parsed
+ */
+int ProcessCmdLineMultiInt(int argc, char *argv[], int *idx, const char* name, int *value);
+
 #endif /* _XSERVER_OS_CMELINE_H */

os/connection.c

@@ -98,6 +98,7 @@ SOFTWARE.
 #include "os/audit.h"
 #include "os/auth.h"
 #include "os/client_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "misc.h"               /* for typedef of pointer */

os/inputthread.c

@@ -35,6 +35,7 @@
 
 #include "dix/input_priv.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 
 #include "inputstr.h"
 #include "opaque.h"

os/log.c

@@ -88,12 +88,17 @@ OR PERFORMANCE OF THIS SOFTWARE.
 #include <X11/Xfuncproto.h>
 #include <X11/Xos.h>
 
+#ifdef CONFIG_SYSLOG
+#include <syslog.h>
+#endif
+
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
 #include "os/audit.h"
 #include "os/bug_priv.h"
 #include "os/ddx_priv.h"
 #include "os/fmt.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 
 #include "opaque.h"
@@ -109,13 +114,18 @@ OR PERFORMANCE OF THIS SOFTWARE.
 /* Default logging parameters. */
 #define DEFAULT_LOG_VERBOSITY		0
 #define DEFAULT_LOG_FILE_VERBOSITY	3
+#define DEFAULT_SYSLOG_VERBOSITY	0
+
+Bool logSync = FALSE;
+int logVerbosity = DEFAULT_LOG_VERBOSITY;
+int logFileVerbosity = DEFAULT_LOG_FILE_VERBOSITY;
+
+#ifdef CONFIG_SYSLOG
+int xorgSyslogVerbosity = DEFAULT_SYSLOG_VERBOSITY;
+const char *xorgSyslogIdent = "X";
+#endif
 
-static FILE *logFile = NULL;
 static int logFileFd = -1;
-static Bool logFlush = FALSE;
-static Bool logSync = FALSE;
-static int logVerbosity = DEFAULT_LOG_VERBOSITY;
-static int logFileVerbosity = DEFAULT_LOG_FILE_VERBOSITY;
 
 /* Buffer to information logged before the log file is opened. */
 static char *saveBuffer = NULL;
@@ -201,6 +211,24 @@ LogFilePrep(const char *fname, const char *backup, const char *idstring)
 }
 #pragma GCC diagnostic pop
 
+static inline void doLogSync(void) {
+#ifndef WIN32
+    fsync(logFileFd);
+#endif
+}
+
+static void initSyslog(void) {
+#ifdef CONFIG_SYSLOG
+    char buffer[4096];
+    strcpy(buffer, xorgSyslogIdent);
+
+    snprintf(buffer, sizeof(buffer), "%s :%s", xorgSyslogIdent, (display ? display : "<>"));
+
+    /* initialize syslog */
+    openlog(buffer, LOG_PID, LOG_LOCAL1);
+#endif
+}
+
 /*
  * LogInit is called to start logging to a file.  It is also called (with
  * NULL arguments) when logging to a file is not wanted.  It must always be
@@ -236,19 +264,14 @@ LogInit(const char *fname, const char *backup)
                 saved_log_backup = strdup(backup);
         } else
             logFileName = LogFilePrep(fname, backup, display);
-        if ((logFile = fopen(logFileName, "w")) == NULL)
-            FatalError("Cannot open log file \"%s\"\n", logFileName);
-        setvbuf(logFile, NULL, _IONBF, 0);
 
-        logFileFd = fileno(logFile);
+        if ((logFileFd = open(logFileName, O_WRONLY | O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP)) == -1)
+            FatalError("Cannot open log file \"%s\": %s\n", logFileName, strerror(errno));
 
         /* Flush saved log information. */
         if (saveBuffer && bufferSize > 0) {
-            fwrite(saveBuffer, bufferPos, 1, logFile);
-            fflush(logFile);
-#ifndef WIN32
-            fsync(fileno(logFile));
-#endif
+            write(logFileFd, saveBuffer, bufferPos);
+            doLogSync();
         }
     }
 
@@ -263,6 +286,7 @@ LogInit(const char *fname, const char *backup)
     }
     needBuffer = FALSE;
 
+    initSyslog();
     return logFileName;
 }
 
@@ -294,44 +318,23 @@ LogSetDisplay(void)
         free(saved_log_fname);
         free(saved_log_backup);
     }
+    initSyslog();
 }
 
 void
 LogClose(enum ExitCode error)
 {
-    if (logFile) {
+    if (logFileFd != -1) {
         int msgtype = (error == EXIT_NO_ERROR) ? X_INFO : X_ERROR;
         LogMessageVerb(msgtype, -1,
                 "Server terminated %s (%d). Closing log file.\n",
                 (error == EXIT_NO_ERROR) ? "successfully" : "with error",
                 error);
-        fclose(logFile);
-        logFile = NULL;
+        close(logFileFd);
         logFileFd = -1;
     }
 }
 
-Bool
-LogSetParameter(LogParameter param, int value)
-{
-    switch (param) {
-    case XLOG_FLUSH:
-        logFlush = value ? TRUE : FALSE;
-        return TRUE;
-    case XLOG_SYNC:
-        logSync = value ? TRUE : FALSE;
-        return TRUE;
-    case XLOG_VERBOSITY:
-        logVerbosity = value;
-        return TRUE;
-    case XLOG_FILE_VERBOSITY:
-        logFileVerbosity = value;
-        return TRUE;
-    default:
-        return FALSE;
-    }
-}
-
 enum {
     LMOD_LONG     = 0x1,
     LMOD_LONGLONG = 0x2,
@@ -550,6 +553,19 @@ vpnprintf(char *string, int size_in, const char *f, va_list args)
     return s_idx;
 }
 
+static void
+LogSyslogWrite(int verb, const char *buf, size_t len, Bool end_line) {
+#ifdef CONFIG_SYSLOG
+    if (inSignalContext) // syslog() ins't signal-safe yet :(
+        return;          // shall we try syslog(2) syscall instead ?
+
+    if (verb >= 0 && xorgSyslogVerbosity < verb)
+        return;
+
+    syslog(LOG_PID, "%.*s", (int)len, buf);
+#endif
+}
+
 /* This function does the actual log message writes. It must be signal safe.
  * When attempting to call non-signal-safe functions, guard them with a check
  * of the inSignalContext global variable. */
@@ -559,37 +575,31 @@ LogSWrite(int verb, const char *buf, size_t len, Bool end_line)
     static Bool newline = TRUE;
     int ret;
 
+    LogSyslogWrite(verb, buf, len, end_line);
+
     if (verb < 0 || logVerbosity >= verb)
         ret = write(2, buf, len);
 
     if (verb < 0 || logFileVerbosity >= verb) {
         if (inSignalContext && logFileFd >= 0) {
             ret = write(logFileFd, buf, len);
-#ifndef WIN32
-            if (logFlush && logSync)
-                fsync(logFileFd);
-#endif
+            if (logSync)
+                doLogSync();
         }
-        else if (!inSignalContext && logFile) {
+        else if (!inSignalContext && logFileFd != -1) {
             if (newline) {
                 time_t t = time(NULL);
                 struct tm tm;
                 char fmt_tm[32];
 
                 localtime_r(&t, &tm);
-                strftime(fmt_tm, sizeof(fmt_tm) - 1, "%Y-%m-%d %H:%M:%S", &tm);
-
-                fprintf(logFile, "[%s] ", fmt_tm);
+                strftime(fmt_tm, sizeof(fmt_tm) - 1, "[%Y-%m-%d %H:%M:%S] ", &tm);
+                write(logFileFd, fmt_tm, strlen(fmt_tm));
             }
             newline = end_line;
-            fwrite(buf, len, 1, logFile);
-            if (logFlush) {
-                fflush(logFile);
-#ifndef WIN32
-                if (logSync)
-                    fsync(fileno(logFile));
-#endif
-            }
+            write(logFileFd, buf, len);
+            if (logSync)
+                doLogSync();
         }
         else if (!inSignalContext && needBuffer) {
             if (len > bufferUnused) {

os/log_priv.h

@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: MIT OR X11
+ *
+ * Copyright © 2024 Enrico Weigelt, metux IT consult <info@metux.net>
+ */
+#ifndef _XSERVER_LOG_PRIV_H
+#define _XSERVER_LOG_PRIV_H
+
+#include <sys/types.h>
+#include <X11/Xdefs.h>
+
+#include "include/os.h"
+
+/**
+ * @brief force fsync() on each log write
+ *
+ * If set to TRUE, force fsync() on each log write.
+ */
+extern Bool logSync;
+
+/**
+ * @brief console log verbosity (stderr)
+ *
+ * The verbosity level of logging to console. All messages with verbosity
+ * level below this one will be written to stderr
+ */
+extern int logVerbosity;
+
+/**
+ * @brief log file verbosity
+ *
+ * The verbosity level of logging to per-display file. All messages with
+ * verbosity level below this one will be written to the log file.
+ */
+extern int logFileVerbosity;
+
+/**
+ * @brief syslog verbosity
+ *
+ * The verbosity level of logging to syslog. All messages with
+ * verbosity level below this one will be sent to local syslog daemon.
+ */
+extern int xorgSyslogVerbosity;
+
+/**
+ * @brief syslog identifier
+ *
+ * The identifier prefix used for syslog logging.
+ * Per default will be filled with basename(argv[0]). DDX'es can override
+ * this before calling LogInit()
+ */
+extern const char *xorgSyslogIdent;
+
+/**
+ * @brief initialize logging and open log files
+ *
+ * Make backup of existing log file, create a new one and open it for logging.
+ *
+ * - May be called with NULL or "", if no logging is desired.
+ *
+ * - Must always be called, otherwise log messages will fill up the buffer and
+ *   let it grow infinitely.
+ *
+ * - if "%s" is present in fname, it will be replaced with the display string or pid
+ *
+ * @param fname log file name template. if NULL, dont write any log.
+ * @param backup name for the old logfile.
+ * @return new log file name
+ */
+const char* LogInit(const char *fname, const char *backup);
+
+/**
+ * @brief rename the current log file according display name
+ *
+ * Renames the current log file with per display prefix (e.g. "Xorg.log.0")
+ *
+ */
+void LogSetDisplay(void);
+
+/**
+ * @brief log exit code, then flush and close log file and write
+ *
+ * Logs the exit code (and success/error state), then flush and close log file.
+ */
+void LogClose(enum ExitCode error);
+
+#ifdef DEBUG
+/**
+ * @brief log debug messages (like errors) if symbol DEBUG is defined
+ */
+#define DebugF ErrorF
+#else
+#define DebugF(...)             /* */
+#endif
+
+#endif /* _XSERVER_LOG_PRIV_H */

os/meson.build

@@ -5,6 +5,7 @@ srcs_os = [
     'auth.c',
     'backtrace.c',
     'client.c',
+    'cmdline.c',
     'connection.c',
     'fmt.c',
     'inputthread.c',
@@ -22,6 +23,8 @@ srcs_os = [
     'log.c',
 ]
 
+conf_data.set('CONFIG_SYSLOG', cc.has_header('syslog.h') ? '1' : false)
+
 # Wrapper code for missing C library functions. Note that conf_data contains either '1' or false.
 srcs_libc = []
 if conf_data.get('HAVE_REALLOCARRAY').to_int() == 0

os/osinit.c

@@ -60,6 +60,7 @@ SOFTWARE.
 
 #include "dix/dix_priv.h"
 #include "os/busfault.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "os/serverlock.h"
 

os/utils.c

@@ -77,8 +77,7 @@ __stdcall unsigned long GetTickCount(void);
 #define TRANS_REOPEN
 #include <X11/Xtrans/Xtrans.h>
 
-#include "os/audit.h"
-#include "os/client_priv.h"
+#include <libgen.h>
 
 #include "input.h"
 #include "dixfont.h"
@@ -106,10 +105,13 @@ __stdcall unsigned long GetTickCount(void);
 
 #include "dix/dix_priv.h"
 #include "dix/input_priv.h"
+#include "os/audit.h"
 #include "os/auth.h"
 #include "os/bug_priv.h"
+#include "os/client_priv.h"
 #include "os/cmdline.h"
 #include "os/ddx_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "os/serverlock.h"
 
@@ -439,6 +441,12 @@ ProcessCommandLine(int argc, char *argv[])
     }
     SeatId = getenv("XDG_SEAT");
 
+#ifdef CONFIG_SYSLOG
+    xorgSyslogIdent = getenv("SYSLOG_IDENT");
+    if (!xorgSyslogIdent)
+        xorgSyslogIdent = strdup(basename(argv[0]));
+#endif
+
     for (i = 1; i < argc; i++) {
         /* call ddx first, so it can peek/override if it wants */
         if ((skip = ddxProcessArgument(argc, argv, i))) {
@@ -805,6 +813,9 @@ ProcessCommandLine(int argc, char *argv[])
             else
                 UseMsg();
         }
+#ifdef CONFIG_SYSLOG
+        else if (ProcessCmdLineMultiInt(argc, argv, &i, "-syslogverbose", &xorgSyslogVerbosity));
+#endif
         else {
             ErrorF("Unrecognized option: %s\n", argv[i]);
             UseMsg();

test/signal-logging.c

@@ -30,6 +30,7 @@
 #include <unistd.h>
 
 #include "os/fmt.h"
+#include "os/log_priv.h"
 
 #include "assert.h"
 #include "misc.h"
@@ -149,7 +150,7 @@ number_formatting(void)
                                 -0x7FFFFFFFFFFFFFFF, /* Maximum 64-bit signed number */
     } ;
 
-    LogSetParameter(XLOG_VERBOSITY, -1);
+    logVerbosity = -1;
 
     for (i = 0; i < ARRAY_SIZE(unsigned_tests); i++)
         assert(check_number_format_test(unsigned_tests[i]));
@@ -181,7 +182,7 @@ static void logging_format(void)
     uintptr_t ptr;
     char *fname = NULL;
 
-    LogSetParameter(XLOG_VERBOSITY, -1);
+    logVerbosity = -1;
 
     /* set up buf to contain ".....end" */
     memset(buf, '.', sizeof(buf));

xkb/XKBMAlloc.c

@@ -29,9 +29,12 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <stdio.h>
 #include <X11/X.h>
 #include <X11/Xproto.h>
+#include <X11/keysym.h>
+
+#include "os/log_priv.h"
+
 #include "misc.h"
 #include "inputstr.h"
-#include <X11/keysym.h>
 #include <xkbsrv.h>
 
 /***====================================================================***/

xkb/ddxLoad.c

@@ -39,6 +39,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <X11/extensions/XKM.h>
 
 #include "dix/dix_priv.h"
+#include "os/log_priv.h"
 #include "os/osdep.h"
 #include "xkb/xkbfile_priv.h"
 #include "xkb/xkbfmisc_priv.h"

xkb/maprules.c

@@ -41,6 +41,7 @@
 #include <X11/Xatom.h>
 #include <X11/keysym.h>
 
+#include "os/log_priv.h"
 #include "xkb/xkbrules_priv.h"
 
 #include "misc.h"

xkb/xkbAccessX.c

@@ -37,6 +37,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <X11/extensions/XIproto.h>
 
 #include "dix/input_priv.h"
+#include "os/log_priv.h"
 #include "xkb/xkbsrv_priv.h"
 
 #include "exglobals.h"

xkb/xkbEvents.c

@@ -34,6 +34,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <X11/extensions/XIproto.h>
 
 #include "dix/exevents_priv.h"
+#include "os/log_priv.h"
 
 #include "inputstr.h"
 #include "exglobals.h"

xkb/xkbInit.c

@@ -41,6 +41,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 #include "os/bug_priv.h"
 #include "os/cmdline.h"
+#include "os/log_priv.h"
 #include "xkb/xkbsrv_priv.h"
 
 #include "misc.h"

xkb/xkbPrKeyEv.c

@@ -34,6 +34,7 @@ THE USE OR PERFORMANCE OF THIS SOFTWARE.
 #include <X11/keysym.h>
 
 #include "dix/input_priv.h"
+#include "os/log_priv.h"
 #include "xkb/xkbsrv_priv.h"
 
 #include "misc.h"

xkb/xkbUtils.c

@@ -58,6 +58,7 @@ DEALINGS IN THE SOFTWARE.
 #define	XK_CYRILLIC
 #include <X11/keysym.h>
 
+#include "os/log_priv.h"
 #include "xkb/xkbsrv_priv.h"
 
 #include "os.h"

xkb/xkmread.c

@@ -34,6 +34,7 @@
 #include <X11/keysym.h>
 #include <X11/extensions/XKMformat.h>
 
+#include "os/log_priv.h"
 #include "xkb/xkbfile_priv.h"
 #include "xkb/xkbfmisc_priv.h"