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Diffstat (limited to 'xorg-server/os/osinit.c')
-rw-r--r--xorg-server/os/osinit.c122
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);