Signal logging for Linux 2.4.x kernels.
- Jedi/Sector One <j@4u.net>.

--- kernel/signal.c.orig	2002-12-08 13:00:39.000000000 +0100
+++ kernel/signal.c	2002-12-08 14:06:59.000000000 +0100
@@ -529,6 +529,46 @@
 	if (!sig || !t->sig)
 		goto out_nolock;
 
+    switch (sig) {
+    case SIGPIPE:
+    case SIGALRM:
+    case SIGURG:
+    case SIGXCPU:
+    case SIGXFSZ:
+    case SIGVTALRM:
+    case SIGPROF:
+    case SIGIO:
+        if (!ignored_signal(sig, t)) {
+            break;
+        }
+    case SIGILL:
+    case SIGTRAP:
+    case SIGIOT:
+    case SIGBUS:
+    case SIGFPE:
+    case SIGSEGV:
+    case SIGSTKFLT:
+    case SIGPWR:
+    case SIGSYS:
+        if (t->p_pptr != NULL) {
+            printk(KERN_ERR "signal %d received by (%.32s:%d) UID(%lu) "
+                   "EUID(%lu), parent (%.32s:%d) UID(%lu) EUID(%lu)%s\n",
+                   sig, t->comm, t->pid,
+                   (unsigned long) t->uid,
+                   (unsigned long) t->euid,
+                   t->p_pptr->comm, t->p_pptr->pid,
+                   (unsigned long) t->p_pptr->uid,
+                   (unsigned long) t->p_pptr->euid,
+                   ignored_signal(sig, t) ? " [ignored]" : "");
+        } else {
+            printk(KERN_ERR "signal %d received by (%.32s:%d) UID(%lu) "
+                   "EUID(%lu), zombie%s\n", sig, t->comm, t->pid,
+                   (unsigned long) t->uid,
+                   (unsigned long) t->euid,
+                   ignored_signal(sig, t) ? " [ignored]" : "");
+        }
+    }
+    
 	spin_lock_irqsave(&t->sigmask_lock, flags);
 	handle_stop_signal(sig, t);