Function logStackTrace

app/redis-6.2.6/src/debug.c:1550–1578

Logs the stack trace using the backtrace() call. This function is designed * to be called from signal handlers safely. * The eip argument is optional (can take NULL). * The uplevel argument indicates how many of the calling functions to skip. */

 * The uplevel argument indicates how many of the calling functions to skip.
 */
void logStackTrace(void *eip, int uplevel) {
    void *trace[100];
    int trace_size = 0, fd = openDirectLogFiledes();
    char *msg;
    uplevel++; /* skip this function */

    if (fd == -1) return; /* If we can't log there is anything to do. */

    /* Get the stack trace first! */
    trace_size = backtrace(trace, 100);

    msg = "\n------ STACK TRACE ------\n";
    if (write(fd,msg,strlen(msg)) == -1) {/* Avoid warning. */};

    if (eip) {
        /* Write EIP to the log file*/
        msg = "EIP:\n";
        if (write(fd,msg,strlen(msg)) == -1) {/* Avoid warning. */};
        backtrace_symbols_fd(&eip, 1, fd);
    }

    /* Write symbols to log file */
    msg = "\nBacktrace:\n";
    if (write(fd,msg,strlen(msg)) == -1) {/* Avoid warning. */};
    backtrace_symbols_fd(trace+uplevel, trace_size-uplevel, fd);

    /* Cleanup */
    closeDirectLogFiledes(fd);
}

#endif /* HAVE_BACKTRACE */