Added -dumpstack option to catch fatal signals for stacktrace dumping. Writes to both stderr and a crash.log in the WORKING directory. Admins are expected to email a copy or something to an FTE dev, then delete it. Clients connecting will be notified, but unable to obtain actual details via quake.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/branches/wip@3813 fc73d0e0-1445-4013-8a0c-d673dee63da5

engine/Makefile

@@ -270,6 +270,7 @@ CLIENT_ONLY_CFLAGS=-DCLIENTONLY
 SERVER_ONLY_CFLAGS=-DSERVERONLY
 JOINT_CFLAGS=
 DEBUG_CFLAGS=-ggdb -g
+DEBUG_CFLAGS=-rdynamic
 PROFILE_CFLAGS=-pg
 
 ifeq ($(FTE_TARGET),win32)

engine/client/cl_main.c

@@ -3117,10 +3117,6 @@ void CL_Init (void)
 	Cmd_AddCommand ("demo_jump", CL_DemoJump_f);
 	Cmd_AddCommand ("timedemo", CL_TimeDemo_f);
 
-#ifdef _DEBUG
-	Cmd_AddCommand ("crashme", (void*)~0);
-#endif
-
 	Cmd_AddCommand ("showpic", SCR_ShowPic_Script_f);
 
 	Cmd_AddCommand ("startdemos", CL_Startdemos_f);

engine/common/common.c

@@ -3309,6 +3309,8 @@ void COM_Init (void)
 	Cmd_AddCommand ("dir", COM_Dir_f);			//q3 like
 	Cmd_AddCommand ("flocate", COM_Locate_f);	//prints the pak or whatever where this file can be found.
 	Cmd_AddCommand ("version", COM_Version_f);	//prints the pak or whatever where this file can be found.
+	
+	Cmd_AddCommand ("crashme", (void*)0); //debugging feature, makes it jump to an invalid address
 
 	COM_InitFilesystem ();
 

engine/server/sv_main.c

@@ -1630,6 +1630,22 @@ void SV_AcceptMessage(int protocol)
 	Netchan_OutOfBand (NS_SERVER, net_from, len, (qbyte *)string);
 }
 
+#ifndef _WIN32
+#include <sys/stat.h>
+static void SV_CheckRecentCrashes(client_t *tellclient)
+{
+	struct stat sb;
+	if (-1 != stat("crash.log", &sb))
+	{
+		SV_ClientPrintf(tellclient, PRINT_HIGH, "\1WARNING: crash.log exists, dated %s\n", ctime(&sb.st_mtime));
+	}
+}
+#else
+static void SV_CheckRecentCrashes(client_t *tellclient)
+{
+}
+#endif
+
 /*
 ==================
 SVC_DirectConnect
@@ -2389,6 +2405,8 @@ client_t *SVC_DirectConnect(void)
 			SV_ClientPrintf(newcl, PRINT_CHAT, "%s\n", sv_motd[i].string);
 	}
 
+	SV_CheckRecentCrashes(newcl);
+
 #ifdef PEXT2_VOICECHAT
 	SV_VoiceInitClient(newcl);
 #endif

engine/server/sv_sys_unix.c

@@ -637,6 +637,32 @@ void Sys_Shutdown (void)
 {
 }
 
+#include <execinfo.h>
+static void Friendly_Crash_Handler(int sig)
+{
+	int fd;
+	void *array[10];
+	size_t size;
+
+	// get void*'s for all entries on the stack
+	size = backtrace(array, 10);
+
+	// print out all the frames to stderr
+	fprintf(stderr, "Error: signal %d:\n", sig);
+	backtrace_symbols_fd(array, size, 2);
+
+	fd = open("crash.log", O_WRONLY|O_CREAT|O_APPEND, S_IRUSR | S_IWUSR | S_IRGRP);
+	if (fd != -1)
+	{
+		write(fd, "Crash Log:\n", 11);
+		size = backtrace(array, 10);
+		backtrace_symbols_fd(array, size, fd);
+		write(fd, "\n", 1);
+		close(fd);
+	}
+	exit(1);
+}
+
 /*
 =============
 main
@@ -661,6 +687,12 @@ int main(int argc, char *argv[])
 	parms.argc = com_argc;
 	parms.argv = com_argv;
 
+	if (COM_CheckParm("-dumpstack"))
+	{
+		signal(SIGILL, Friendly_Crash_Handler);
+		signal(SIGSEGV, Friendly_Crash_Handler);
+		signal(SIGBUS, Friendly_Crash_Handler);
+	}
 
 	parms.memsize = 16*1024*1024;