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Be a bit more precise with backtrace prints. Don't include the signal handler, and make sure the faulting frame is not corrupted by the handler on x86.

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git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@4326 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
Spoike 2013-05-04 04:01:47 +00:00
parent 98d4e12ffc
commit 6b41038183
1 changed files with 39 additions and 13 deletions
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52
engine/server/sv_sys_unix.c
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@ -645,34 +645,57 @@ void Sys_Shutdown (void)
#ifdef __linux__ /*should probably be GNUC but whatever*/
#include <execinfo.h>
static void Friendly_Crash_Handler(int sig)
#ifdef __i386__
#define __USE_GNU
#include <ucontext.h>
#endif
static void Friendly_Crash_Handler(int sig, siginfo_t *info, void *vcontext)
{
int fd;
void *array[10];
size_t size;
int firstframe = 0;
char signame[32];
switch(sig)
{
case SIGILL: strcpy(signame, "SIGILL"); break;
case SIGFPE: strcpy(signame, "SIGFPE"); break;
case SIGBUS: strcpy(signame, "SIGBUS"); break;
case SIGSEGV: Q_snprintfz(signame, sizeof(signame), "SIGSEGV (%p)", info->si_addr); break;
default: Q_snprintfz(signame, sizeof(signame), "%i", sig); break;
}
// get void*'s for all entries on the stack
size = backtrace(array, 10);
#if defined(__i386__)
ucontext_t *uc = vcontext;
array[1] = uc->uc_mcontext.gregs[REG_EIP];
firstframe = 1;
#elif defined(__amd64__)
firstframe = 2;
#endif
// print out all the frames to stderr
fprintf(stderr, "Error: signal %d:\n", sig);
backtrace_symbols_fd(array, size, 2);
fprintf(stderr, "Error: signal %s:\n", signame);
backtrace_symbols_fd(array+firstframe, size-firstframe, 2);
fd = open("crash.log", O_WRONLY|O_CREAT|O_APPEND, S_IRUSR | S_IWUSR | S_IRGRP);
if (fd != -1)
{
time_t rawtime;
struct tm * timeinfo;
char tbuffer [80];
char buffer [80];
time (&rawtime);
timeinfo = localtime (&rawtime);
strftime (buffer, sizeof(buffer), "Time: %Y-%m-%d %H:%M:%S\n",timeinfo);
write(fd, buffer, strlen(buffer));
Q_snprintf(buffer, sizeof(buffer), "Binary: "__DATE__" "__TIME__"\n");
Q_snprintfz(buffer, sizeof(buffer), "Binary: "__DATE__" "__TIME__"\n");
write(fd, buffer, strlen(buffer));
Q_snprintf(buffer, sizeof(buffer), "Ver: %i.%02i%s\n", FTE_VER_MAJOR, FTE_VER_MINOR
Q_snprintfz(buffer, sizeof(buffer), "Ver: %i.%02i%s\n", FTE_VER_MAJOR, FTE_VER_MINOR,
#ifdef OFFICIAL_RELEASE
" (official)");
#else
@ -682,13 +705,12 @@ static void Friendly_Crash_Handler(int sig)
#ifdef SVNREVISION
if (strcmp(STRINGIFY(SVNREVISION), "-"))
{
Q_snprintf(buffer, sizeof(buffer), "Revision: %s\n", SVNREVISION);
Q_snprintfz(buffer, sizeof(buffer), "Revision: %s\n", STRINGIFY(SVNREVISION));
write(fd, buffer, strlen(buffer));
}
#endif
size = backtrace(array, 10);
backtrace_symbols_fd(array, size, fd);
backtrace_symbols_fd(array + firstframe, size - firstframe, fd);
write(fd, "\n", 1);
close(fd);
}
@ -723,10 +745,14 @@ int main(int argc, char *argv[])
#ifdef __linux__
if (!COM_CheckParm("-nodumpstack"))
{
signal(SIGILL, Friendly_Crash_Handler);
signal(SIGFPE, Friendly_Crash_Handler);
signal(SIGSEGV, Friendly_Crash_Handler);
signal(SIGBUS, Friendly_Crash_Handler);
struct sigaction act;
memset(&act, 0, sizeof(act));
act.sa_sigaction = Friendly_Crash_Handler;
act.sa_flags = SA_SIGINFO | SA_RESTART;
sigaction(SIGILL, &act, NULL);
sigaction(SIGFPE, &act, NULL);
sigaction(SIGSEGV, &act, NULL);
sigaction(SIGBUS, &act, NULL);
}
#endif