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/* Copyright 2013-2014
* Kaz Kylheku <kaz@kylheku.com>
* Vancouver, Canada
* All rights reserved.
*
* BSD License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <setjmp.h>
#include <wchar.h>
#include <dirent.h>
#include <signal.h>
#include "config.h"
#include "lib.h"
#include "stream.h"
#include "hash.h"
#include "gc.h"
#include "signal.h"
#include "unwind.h"
#define MAX_SIG 32
volatile sig_atomic_t async_sig_enabled = 0;
static val sig_lambda[MAX_SIG];
volatile unsigned long sig_deferred;
val sig_hup, sig_int, sig_quit, sig_ill, sig_trap, sig_abrt, sig_bus;
val sig_fpe, sig_kill, sig_usr1, sig_segv, sig_usr2, sig_pipe, sig_alrm;
val sig_term, sig_chld, sig_cont, sig_stop, sig_tstp, sig_ttin;
val sig_ttou, sig_urg, sig_xcpu, sig_xfsz, sigtalrm, sig_prof;
val sig_poll, sig_sys, sig_winch, sig_iot, sig_stkflt;
val sig_io, sig_lost, sig_pwr;
static void sig_handler(int sig)
{
val lambda = sig_lambda[sig];
if (lambda) {
if (async_sig_enabled) {
async_sig_enabled = 0;
if (funcall2(lambda, num_fast(sig), t))
sig_deferred |= (1UL << sig);
async_sig_enabled = 1;
} else {
sig_deferred |= (1UL << sig);
}
}
}
void sig_init(void)
{
int i;
for (i = 0; i < MAX_SIG; i++) {
/* t means SIG_DFL, which is what signals
* are before we manipulate them. */
sig_lambda[i] = t;
prot1(&sig_lambda[i]);
}
sig_hup = num_fast(SIGHUP);
sig_int = num_fast(SIGINT);
sig_quit = num_fast(SIGQUIT);
sig_ill = num_fast(SIGILL);
sig_trap = num_fast(SIGTRAP);
sig_abrt = num_fast(SIGABRT);
sig_bus = num_fast(SIGBUS);
sig_fpe = num_fast(SIGFPE);
sig_kill = num_fast(SIGKILL);
sig_usr1 = num_fast(SIGUSR1);
sig_segv = num_fast(SIGSEGV);
sig_usr2 = num_fast(SIGUSR2);
sig_pipe = num_fast(SIGPIPE);
sig_alrm = num_fast(SIGALRM);
sig_term = num_fast(SIGTERM);
sig_chld = num_fast(SIGCHLD);
sig_cont = num_fast(SIGCONT);
sig_stop = num_fast(SIGSTOP);
sig_tstp = num_fast(SIGTSTP);
sig_ttin = num_fast(SIGTTIN);
sig_ttou = num_fast(SIGTTOU);
sig_urg = num_fast(SIGURG);
sig_xcpu = num_fast(SIGXCPU);
sig_xfsz = num_fast(SIGXFSZ);
sigtalrm = num_fast(SIGVTALRM);
sig_prof = num_fast(SIGPROF);
sig_poll = num_fast(SIGPOLL);
sig_sys = num_fast(SIGSYS);
#ifdef SIGWINCH
sig_winch = num_fast(SIGWINCH);
#endif
#ifdef SIGIOT
sig_iot = num_fast(SIGIOT);
#endif
#ifdef SIGSTKFLT
sig_stkflt = num_fast(SIGSTKFLT);
#endif
#ifdef SIGIO
sig_io = num_fast(SIGIO);
#endif
#ifdef SIGLOST
sig_lost = num_fast(SIGLOST);
#endif
#ifdef SIGPWR
sig_pwr = num_fast(SIGPWR);
#endif
}
val set_sig_handler(val signo, val lambda)
{
cnum sig = c_num(signo);
val old_lambda;
sigset_t block, saved;
sigfillset(&block);
sigprocmask(SIG_BLOCK, &block, &saved);
if (sig < 0 || sig >= MAX_SIG)
uw_throwf(error_s, lit("set-sig-handler: signal ~s out of range\n"), sig, nao);
old_lambda = sig_lambda[sig];
if (lambda != old_lambda) {
unsigned long mask = 1UL << sig;
if (lambda == nil) {
signal(sig, SIG_IGN);
sig_deferred &= ~mask;
} else if (lambda == t) {
signal(sig, SIG_DFL);
sig_deferred &= ~mask;
} else {
struct sigaction sa = { 0 };
type_check(lambda, FUN);
sa.sa_flags = SA_RESTART;
sa.sa_handler = sig_handler;
sigfillset(&sa.sa_mask);
sigaction(sig, &sa, 0);
}
sig_lambda[sig] = lambda;
}
sigprocmask(SIG_SETMASK, &saved, 0);
return old_lambda;
}
val get_sig_handler(val signo)
{
cnum sig = c_num(signo);
if (sig < 0 || sig >= MAX_SIG)
uw_throwf(error_s, lit("get-sig-handler: signal ~s out of range\n"), sig, nao);
return sig_lambda[sig];
}
val sig_check(void)
{
unsigned long sd;
int i;
if ((sd = sig_deferred) == 0)
return nil;
for (i = 0; i < MAX_SIG; i++) {
unsigned long mask = 1UL << i;
if ((sd & mask) != 0) {
sd &= ~mask;
sig_deferred = sd;
funcall2(sig_lambda[i], num_fast(i), nil);
}
}
return t;
}
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