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Top Forums Programming Application Cleanup during Linux Shutdown Post 302392493 by whatisron on Thursday 4th of February 2010 02:14:09 PM
Old 02-04-2010
Application Cleanup during Linux Shutdown

I'm trying to do some cleanup (write open files) when Linux shuts down. I thought the right method would be to trap SIGTERM and do the necessary processing. Here's my sample code:

Code:
#include <stdio.h> // for File I/O
#include <signal.h> // for signals
#include <unistd.h> // for sleep()

void handler(int signal)
{
    FILE *out=fopen("test.txt","at");
    if (out)
    {
        fprintf(out,"got %d\n",signal);
        fclose(out);
    }
}

int main()
{
    signal(SIGTERM,handler);
    signal(SIGINT,handler);
    sleep(30);
}

When I run this, and press Ctrl-C, it writes "got 2" to test.txt. However, if I logout/reboot, nothing is written to the file.

Any help or ideas would be appreciated!

-Ron
 

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REGISTER_SHUTDOWN_FUNCTION(3)						 1					     REGISTER_SHUTDOWN_FUNCTION(3)

register_shutdown_function - Register a function for execution on shutdown

SYNOPSIS
void register_shutdown_function (callable $callback, [mixed $parameter], [mixed $...]) DESCRIPTION
Registers a $callback to be executed after script execution finishes or exit(3) is called. Multiple calls to register_shutdown_function(3) can be made, and each will be called in the same order as they were registered. If you call exit(3) within one registered shutdown function, processing will stop completely and no other registered shutdown functions will be called. PARAMETERS
o $callback - The shutdown callback to register. The shutdown callbacks are executed as the part of the request, so it's possible to send output from them and access output buffers. o $parameter - It is possible to pass parameters to the shutdown function by passing additional parameters. o $... - RETURN VALUES
No value is returned. ERRORS
/EXCEPTIONS If the passed callback is not callable a E_WARNING level error will be generated. EXAMPLES
Example #1 register_shutdown_function(3) example <?php function shutdown() { // This is our shutdown function, in // here we can do any last operations // before the script is complete. echo 'Script executed with success', PHP_EOL; } register_shutdown_function('shutdown'); ?> NOTES
Note Working directory of the script can change inside the shutdown function under some web servers, e.g. Apache. Note Shutdown functions will not be executed if the process is killed with a SIGTERM or SIGKILL signal. While you cannot intercept a SIGKILL, you can use pcntl_signal(3) to install a handler for a SIGTERM which uses exit(3) to end cleanly. SEE ALSO
auto_append_file, exit(3), The section on connection handling. PHP Documentation Group REGISTER_SHUTDOWN_FUNCTION(3)
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