Lift fatal signal handlers from DDX'es up to a common DIX implementation

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/os/osinit.c b/os/osinit.c
index f9ee73ec1..34d8378a6 100644
--- a/os/osinit.c
+++ b/os/osinit.c
@@ -54,6 +54,8 @@ SOFTWARE.
 #include "os.h"
 #include "osdep.h"
 #include <X11/Xos.h>
+#include <signal.h>
+#include <errno.h>
 
 #include "dixstruct.h"
 
@@ -88,6 +90,58 @@ 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
+{
+  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",
+	     (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)
 {
@@ -97,6 +151,35 @@ OsInit(void)
     char fname[PATH_MAX];
 
     if (!been_here) {
+	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);
+	act.sa_handler = OsSigHandler;
+	act.sa_flags = 0;
+#ifdef SA_SIGINFO
+	act.sa_flags |= SA_SIGINFO;
+#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));
+	    }
+	}
+
 #if !defined(__SCO__) && !defined(__CYGWIN__) && !defined(__UNIXWARE__)
 	fclose(stdin);
 	fclose(stdout);