I"m trying to find out how to close sockets with a signal handler
function in C without having the socket numbers.
...
#include <signal.h>
void sighandler(int);
void socket_closer(void);
void sighandler(int signum)
{
socket_closer(); // Close any open sockets...
}
int main(int argc,char * argv)
{
signal(SIGABRT,sighandler);
signal(SIGFPE,sighandler);
signal(SIGILL,sighandler);
signal(SIGINT,sighandler);
signal(SIGSEGV,sighandler);
signal(SIGTERM,sighandler);
...
`
// Open some UNIX, TCP, RAW, or UDP sockets and enter an infinite
while loop, no closing.
...
// Main never exits normally and this is required.
}
void socket_closer(void)
{
// Need to get the name of socket ???.
close(???);
exit(0);
}
I need to know how to write socket_closer.
Note that the signal handler function does not have any of the socket
numbers and I cannot store them in global variables.
I should close all filehandles too on signal, but sockets first. I'm
trying to use opendir in socket_closer to open
/proc/net/udp, /proc/net/tcp, /proc/net/unix, and /proc/net/raw, but I
can't. Is there a process specific proc directory
that I can open? Specifically, I want the proc entries from the current
process. I need immediate socket cleanup or else
I'd leave the program as-is and wait for the stale sockets to be closed
by Linux. I think it takes between 15 seconds and
three minutes for Linux to clean up the stale sockets. That is a LOT of
time, too long to wait in fact. I'm looking for
a way to catch any signal that the program is exiting and clean up the
sockets even though I don't have the socket numbers._______________________________________________
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