svn merge https://vcxsrv.svn.sourceforge.net/svnroot/vcxsrv/branches/released .

1 files changed, 119 insertions, 3 deletions

diff --git a/xorg-server/os/osinit.c b/xorg-server/os/osinit.c
index 49dfe4999..23a45e5b7 100644
--- a/xorg-server/os/osinit.c
+++ b/xorg-server/os/osinit.c
@@ -54,6 +54,15 @@ SOFTWARE.
 #include "os.h"
 #include "osdep.h"
 #include <X11/Xos.h>
+#include <signal.h>
+#include <errno.h>
+#ifdef HAVE_DLFCN_H
+# include <dlfcn.h>
+#endif
+#ifdef HAVE_BACKTRACE
+#include <execinfo.h>
+#endif
+
 
 #include "dixstruct.h"
 
@@ -88,6 +97,66 @@ int limitStackSpace = -1;
 int limitNoFile = -1;
 #endif
 
+static OsSigWrapperPtr OsSigWrapper = NULL;
+
+OsSigWrapperPtr
+OsRegisterSigWrapper(OsSigWrapperPtr newSigWrapper)
+{
+    OsSigWrapperPtr oldSigWrapper = OsSigWrapper;
+
+    OsSigWrapper = newSigWrapper;
+
+    return oldSigWrapper;
+}
+
+/*
+ * OsSigHandler --
+ *    Catch unexpected signals and exit or continue cleanly.
+ */
+static void
+#ifdef SA_SIGINFO
+OsSigHandler(int signo, siginfo_t *sip, void *unused)
+#else
+OsSigHandler(int signo)
+#endif
+{
+#ifdef RTLD_DI_SETSIGNAL
+  const char *dlerr = dlerror();
+
+  if (dlerr) {
+      LogMessage(X_ERROR, "Dynamic loader error: %s\n", dlerr);
+  }
+#endif /* RTLD_DI_SETSIGNAL */
+
+  if (OsSigWrapper != NULL) {
+      if (OsSigWrapper(signo) == 0) {
+	  /* ddx handled signal and wants us to continue */
+	  return;
+      }
+  }
+
+  /* log, cleanup, and abort */
+  xorg_backtrace();
+
+#ifdef SA_SIGINFO
+  if (sip->si_code == SI_USER) {
+      ErrorF("Recieved signal %d sent by process %ld, uid %ld\n",
+	     signo, (long) sip->si_pid, (long) sip->si_uid);
+  } else {
+      switch (signo) {
+          case SIGSEGV:
+          case SIGBUS:
+          case SIGILL:
+          case SIGFPE:
+	      ErrorF("%s at address %p\n", strsignal(signo), sip->si_addr);
+      }
+  }
+#endif
+
+  FatalError("Caught signal %d (%s). Server aborting\n",
+	     signo, strsignal(signo));
+}
+
 void
 OsInit(void)
 {
@@ -96,11 +165,58 @@ OsInit(void)
     static char* devnull = "/dev/null";
     char fname[PATH_MAX];
 
-#ifdef macII
-    set42sig();
+    if (!been_here) {
+#ifndef _MSC_VER
+	struct sigaction act, oact;
+	int i;
+	int siglist[] = { SIGSEGV, SIGQUIT, SIGILL, SIGFPE, SIGBUS,
+#ifdef SIGSYS
+			  SIGSYS,
+#endif
+#ifdef SIGXCPU
+			  SIGXCPU,
+#endif
+#ifdef SIGXFSZ
+			  SIGXFSZ,
+#endif
+#ifdef SIGEMT
+			  SIGEMT,
+#endif
+			  0 /* must be last */ };
+	sigemptyset(&act.sa_mask);
+#ifdef SA_SIGINFO
+	act.sa_sigaction = OsSigHandler;
+	act.sa_flags = SA_SIGINFO;
+#else
+        act.sa_handler = OsSigHandler;
+        act.sa_flags = 0;
+#endif
+	for (i = 0; siglist[i] != 0; i++) {
+	    if (sigaction(siglist[i], &act, &oact)) {
+		ErrorF("failed to install signal handler for signal %d: %s\n",
+		       siglist[i], strerror(errno));
+	    }
+	}
+#ifdef HAVE_BACKTRACE
+	/*
+	 * initialize the backtracer, since the ctor calls dlopen(), which
+	 * calls malloc(), which isn't signal-safe.
+	 */
+	do {
+	    void *array;
+	    backtrace(&array, 1);
+	} while (0);
 #endif
 
-    if (!been_here) {
+#ifdef RTLD_DI_SETSIGNAL
+	/* Tell runtime linker to send a signal we can catch instead of SIGKILL
+	 * for failures to load libraries/modules at runtime so we can clean up
+	 * after ourselves.
+	 */
+	int failure_signal = SIGQUIT;
+	dlinfo(RTLD_SELF, RTLD_DI_SETSIGNAL, &failure_signal);
+#endif
+#endif
 #if !defined(__SCO__) && !defined(__CYGWIN__) && !defined(__UNIXWARE__)
 	fclose(stdin);
 	fclose(stdout);