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Merge branch 'improve-backtrace' into 'next'

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Clean up the backtrace code and make it use write() more safely.

See merge request STJr/SRB2!1897
This commit is contained in:
sphere 2024-06-03 13:37:48 +00:00
commit d3686b3255
1 changed files with 48 additions and 37 deletions
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83
src/sdl/i_system.c
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@ -271,75 +271,86 @@ SDL_bool framebuffer = SDL_FALSE;
UINT8 keyboard_started = false;
#ifdef UNIXBACKTRACE
#define STDERR_WRITE(string) if (fd != -1) I_OutputMsg("%s", string)
#define CRASHLOG_WRITE(string) if (fd != -1) junk = write(fd, string, strlen(string))
#define CRASHLOG_STDERR_WRITE(string) \
if (fd != -1)\
junk = write(fd, string, strlen(string));\
I_OutputMsg("%s", string)
static void bt_write_file(int fd, const char *string) {
ssize_t written = 0;
ssize_t sourcelen = strlen(string);
while (fd != -1 && (written != -1 && errno != EINTR) && written < sourcelen)
written = write(fd, string, sourcelen);
}
static void bt_write_stderr(const char *string) {
bt_write_file(STDERR_FILENO, string);
}
static void bt_write_all(int fd, const char *string) {
bt_write_file(fd, string);
bt_write_file(STDERR_FILENO, string);
}
static void write_backtrace(INT32 signal)
{
int fd = -1;
#ifndef NOEXECINFO
size_t size;
#endif
time_t rawtime;
struct tm timeinfo;
ssize_t junk;
enum { BT_SIZE = 1024, STR_SIZE = 32 };
#ifndef NOEXECINFO
void *array[BT_SIZE];
void *funcptrs[BT_SIZE];
size_t bt_size;
#endif
char timestr[STR_SIZE];
const char *error = "An error occurred within SRB2! Send this stack trace to someone who can help!\n";
const char *error2 = "(Or find crash-log.txt in your SRB2 directory.)\n"; // Shown only to stderr.
const char *filename = va("%s" PATHSEP "%s", srb2home, "crash-log.txt");
fd = open(va("%s" PATHSEP "%s", srb2home, "crash-log.txt"), O_CREAT|O_APPEND|O_RDWR, S_IRUSR|S_IWUSR);
fd = open(filename, O_CREAT|O_APPEND|O_RDWR, S_IRUSR|S_IWUSR);
if (fd == -1)
I_OutputMsg("\nWARNING: Couldn't open crash log for writing! Make sure your permissions are correct. Please save the below report!\n");
if (fd == -1) // File handle error
bt_write_stderr("\nWARNING: Couldn't open crash log for writing! Make sure your permissions are correct. Please save the below report!\n");
// Get the current time as a string.
time(&rawtime);
localtime_r(&rawtime, &timeinfo);
strftime(timestr, STR_SIZE, "%a, %d %b %Y %T %z", &timeinfo);
CRASHLOG_WRITE("------------------------\n"); // Nice looking seperator
bt_write_file(fd, "------------------------\n"); // Nice looking seperator
CRASHLOG_STDERR_WRITE("\n"); // Newline to look nice for both outputs.
CRASHLOG_STDERR_WRITE(error); // "Oops, SRB2 crashed" message
STDERR_WRITE(error2); // Tell the user where the crash log is.
bt_write_all(fd, "\n"); // Newline to look nice for both outputs.
bt_write_all(fd, "An error occurred within SRB2! Send this stack trace to someone who can help!\n");
if (fd != -1) // If the crash log exists,
bt_write_stderr("(Or find crash-log.txt in your SRB2 directory.)\n"); // tell the user where the crash log is.
// Tell the log when we crashed.
CRASHLOG_WRITE("Time of crash: ");
CRASHLOG_WRITE(timestr);
CRASHLOG_WRITE("\n");
bt_write_file(fd, "Time of crash: ");
bt_write_file(fd, timestr);
bt_write_file(fd, "\n");
// Give the crash log the cause and a nice 'Backtrace:' thing
// The signal is given to the user when the parent process sees we crashed.
CRASHLOG_WRITE("Cause: ");
CRASHLOG_WRITE(strsignal(signal));
CRASHLOG_WRITE("\n"); // Newline for the signal name
bt_write_file(fd, "Cause: ");
bt_write_file(fd, strsignal(signal));
bt_write_file(fd, "\n"); // Newline for the signal name
#ifndef NOEXECINFO
CRASHLOG_STDERR_WRITE("\nBacktrace:\n");
#ifdef NOEXECINFO
bt_write_all(fd, "\nNo Backtrace support\n");
#else
bt_write_all(fd, "\nBacktrace:\n");
// Flood the output and log with the backtrace
size = backtrace(array, BT_SIZE);
backtrace_symbols_fd(array, size, fd);
backtrace_symbols_fd(array, size, STDERR_FILENO);
bt_size = backtrace(funcptrs, BT_SIZE);
backtrace_symbols_fd(funcptrs, bt_size, fd);
backtrace_symbols_fd(funcptrs, bt_size, STDERR_FILENO);
#endif
CRASHLOG_WRITE("\n"); // Write another newline to the log so it looks nice :)
(void)junk;
bt_write_file(fd, "\n"); // Write another newline to the log so it looks nice :)
if (fd != -1) {
fsync(fd); // reaaaaally make sure we got that data written.
close(fd);
}
#undef STDERR_WRITE
#undef CRASHLOG_WRITE
#undef CRASHLOG_STDERR_WRITE
}
#endif // UNIXBACKTRACE
static void I_ReportSignal(int num, int coredumped)