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/*
* UCW Library -- Catching of signals and calling callback functions
*
* (c) 2004, Robert Spalek <robert@ucw.cz>
* (c) 2006 Martin Mares <mj@ucw.cz>
*/
#include <ucw/lib.h>
#include <ucw/threads.h>
#include <ucw/sighandler.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
static int sig_handler_nest[NSIG];
static struct sigaction sig_handler_old[NSIG];
static void
signal_handler_internal(int sig)
{
struct ucwlib_context *ctx = ucwlib_thread_context();
if (!ctx->signal_handlers || !ctx->signal_handlers[sig] || ctx->signal_handlers[sig](sig))
abort();
}
void
handle_signal(int signum)
{
ucwlib_lock();
if (!sig_handler_nest[signum]++)
{
struct sigaction act;
bzero(&act, sizeof(act));
act.sa_handler = signal_handler_internal;
act.sa_flags = SA_NODEFER;
if (sigaction(signum, &act, &sig_handler_old[signum]) < 0)
die("sigaction: %m");
}
ucwlib_unlock();
}
void
unhandle_signal(int signum)
{
ucwlib_lock();
ASSERT(sig_handler_nest[signum]);
if (!--sig_handler_nest[signum])
{
if (sigaction(signum, &sig_handler_old[signum], NULL) < 0)
die("sigaction: %m");
}
ucwlib_unlock();
}
ucw_sighandler_t
set_signal_handler(int signum, ucw_sighandler_t newh)
{
struct ucwlib_context *ctx = ucwlib_thread_context();
if (!ctx->signal_handlers)
ctx->signal_handlers = xmalloc_zero(NSIG * sizeof(ucw_sighandler_t));
ucw_sighandler_t old = ctx->signal_handlers[signum];
ctx->signal_handlers[signum] = newh;
return old;
}