Very Computer

How do you correctly call syslog() to shut the messages down?

Thanks,
Quang

--
Kasper Dupont

Here's the function I'm talking about:

static int LclKernelLog(const char *logTerminal)
        {
        fd_set readSet;
        int fdKernelMsg;
        int fdTerminal, i;
        int fdLogFile;
        int pid;
        char buf[1024];

        /*---------------------------------------------------------------------
         * Open the kmsg file...
         *-------------------------------------------------------------------*/
        fdKernelMsg = open("/proc/kmsg", O_RDONLY,0);
        if (fdKernelMsg < 0)
                return errno;

        /*---------------------------------------------------------------------
         * Create the temp log file
         *-------------------------------------------------------------------*/
        fdLogFile = open("/tmp/sys.log", O_WRONLY | O_CREAT, 0644);
        if (fdLogFile < 0)
                {
                sleep(5);
                close(fdKernelMsg);
                return errno;
                }

        /*---------------------------------------------------------------------
         * Create a process
         *-------------------------------------------------------------------*/
        pid = fork();
        if (pid < 0)
                return errno;

        /*---------------------------------------------------------------------
         * Parent process: Close the file handles
         *-------------------------------------------------------------------*/
        if (pid > 0)
                {
                close(fdKernelMsg);
                close(fdLogFile);
                return 0;
                }

        /*---------------------------------------------------------------------
         * Child: Close the standard in/out/err fds
         *-------------------------------------------------------------------*/
        close(0);
        close(1);
        close(2);

        /*---------------------------------------------------------------------
         * Open the log terminal
         *-------------------------------------------------------------------*/
        fdTerminal = open(logTerminal, O_WRONLY, 0);

        /*---------------------------------------------------------------------
         * Disable log to console
         *-------------------------------------------------------------------*/
        syslog(6, NULL, 0);

        /*---------------------------------------------------------------------
         * Monitor and process the log
         *-------------------------------------------------------------------*/
        while (1)
                {
                /*-------------------------------------------------------------
                 * Set the file descriptor to monitor
                 *-----------------------------------------------------------*/
                FD_ZERO(&readSet);
                FD_SET(fdKernelMsg, &readSet);

                /*-------------------------------------------------------------
                 * Monitor the log and catch it
                 *-----------------------------------------------------------*/
                i = select(fdKernelMsg+1, &readSet, NULL, NULL, NULL);
                if (i <= 0)
                        continue;

                /*-------------------------------------------------------------
                 * Check descriptor for data to read
                 *-----------------------------------------------------------*/
                if (FD_ISSET(fdKernelMsg, &readSet))
                        {
                        i = read(fdKernelMsg, buf, sizeof(buf));
                        if (i > 0)
                                {
                                write(fdTerminal, buf, i);
                                write(fdLogFile, buf, i);
                                }
                        }
                }

        return 0;
        }

--
Quang

+------------------------------------------------------------------

Quote:> Are you sure this has anything to do with syslog? By default
> all kernel messages will be printed directly to the console
> without going through any user process. Perhaps you want one
> of your init scripts to change on of the fields in
> /proc/sys/kernel/printk, I think it is the first one you
> should change.

It works now.  I'm using diet-libc instead of the regular libc and its
parameters are different than the standard syslog() call.

--
Quang