sys_sdl: Implement a basic segfault handler

diff --git a/sys_sdl.c b/sys_sdl.c
index 50cca9d99d5688c2e3442caf963f04e8bfbcfe3a..7a893917dbb177ad2e30a9dec3bb25209d7cb335 100644 (file)
--- a/sys_sdl.c
+++ b/sys_sdl.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/time.h>
+#include <execinfo.h>
 #endif
 
 #ifdef __ANDROID__
@@ -14,6 +15,7 @@
 #endif
 
 #include <signal.h>
+#include <time.h>
 
 #include <SDL.h>
 
@@ -66,6 +68,60 @@ void Sys_Error (const char *error, ...)
        exit (1);
 }
 
+static const char *segfault_witty_comments[] =
+{
+       "Oh no!",
+       "It's gonna be okay.",
+       "Oops...",
+       "I'm sorry :(",
+       "Ooh that's gotta hurt.",
+       "I wish there was more I could do.",
+       "I blame Cloudwalk.",
+       "I blame LadyHavoc.",
+       "I blame divVerent.",
+       "Hi, I'm Null Pointer. Welcome to Jackass!",
+       "I meant to do that!",
+       "Ow.",
+       "Totally not copying that one voxel game with these witty comments.",
+       NULL
+};
+
+static const int segfault_witty_max = 12;
+static qbool segfaulted = false;
+
+static void Sys_HandleSegfault(int signal)
+{
+       void *bt[20];
+       char **btstrings;
+       char crash_report[32768];
+       int numptrs, i, j;
+       time_t t;
+       struct tm t2;
+
+       if(signal != SIGSEGV)
+               Sys_Error("Sys_HandleSegfault: Called without SIGSEGV?!");
+       
+       if(segfaulted)
+               exit(1);
+       
+       segfaulted = true;
+       
+       srand(time(0));
+
+       t = time(NULL);
+       t2 = *localtime(&t);
+
+       numptrs = backtrace(bt, 20);
+       btstrings = backtrace_symbols(bt, numptrs);
+       
+       j = dpsnprintf(crash_report, sizeof(crash_report), "DarkPlaces Crash Report -- %d-%02d-%02d %02d:%02d:%02d\n\n// %s\n\nBacktrace:\n", t2.tm_year + 1900, t2.tm_mon + 1, t2.tm_mday, t2.tm_hour, t2.tm_min, t2.tm_sec, segfault_witty_comments[rand() % (segfault_witty_max + 1)]);
+       
+       for(i = 0; i < numptrs && j != -1; i++)
+               j += dpsnprintf(&crash_report[j], sizeof(crash_report) - j, "%s\n", btstrings[i]);
+
+       Sys_Error("DarkPlaces has crashed. Please report this to a developer.\n\n--CUT HERE--\n%s\n--CUT HERE--", crash_report);
+}
+
 void Sys_PrintToTerminal(const char *text)
 {
 #ifdef __ANDROID__
@@ -181,6 +237,8 @@ void Sys_InitConsole (void)
 
 int main (int argc, char *argv[])
 {
+       struct sigaction sa;
+
        signal(SIGFPE, SIG_IGN);
 
 #ifdef __ANDROID__
@@ -191,6 +249,11 @@ int main (int argc, char *argv[])
        sys.argc = argc;
        sys.argv = (const char **)argv;
 
+       sa.sa_flags = SA_NODEFER;
+       sa.sa_handler = Sys_HandleSegfault;
+
+       sigaction(SIGSEGV, &sa, NULL);
+
        // Sys_Error this early in startup might screw with automated
        // workflows or something if we show the dialog by default.
        nocrashdialog = true;