100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
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/* */
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/* Copyright 2007 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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/* Signal handling, code specific to the bytecode interpreter */
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#include <signal.h>
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#include <errno.h>
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#include "caml/config.h"
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#include "caml/memory.h"
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#include "caml/osdeps.h"
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#include "caml/signals.h"
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#include "caml/signals_machdep.h"
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#ifndef NSIG
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#define NSIG 64
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#endif
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#ifdef _WIN32
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typedef void (*sighandler)(int sig);
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extern sighandler caml_win32_signal(int sig, sighandler action);
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#define signal(sig,act) caml_win32_signal(sig,act)
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#endif
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CAMLexport int volatile caml_something_to_do = 0;
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CAMLexport void (* volatile caml_async_action_hook)(void) = NULL;
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void caml_process_event(void)
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{
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void (*async_action)(void);
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caml_check_urgent_gc (Val_unit);
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caml_process_pending_signals();
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async_action = caml_async_action_hook;
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if (async_action != NULL) {
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caml_async_action_hook = NULL;
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(*async_action)();
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}
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}
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static void handle_signal(int signal_number)
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{
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int saved_errno;
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/* Save the value of errno (PR#5982). */
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saved_errno = errno;
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#if !defined(POSIX_SIGNALS) && !defined(BSD_SIGNALS)
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signal(signal_number, handle_signal);
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#endif
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if (signal_number < 0 || signal_number >= NSIG) return;
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if (caml_try_leave_blocking_section_hook()) {
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caml_execute_signal(signal_number, 1);
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caml_enter_blocking_section_hook();
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}else{
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caml_record_signal(signal_number);
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}
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errno = saved_errno;
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}
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int caml_set_signal_action(int signo, int action)
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{
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void (*act)(int signo), (*oldact)(int signo);
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#ifdef POSIX_SIGNALS
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struct sigaction sigact, oldsigact;
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#endif
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switch (action) {
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case 0: act = SIG_DFL; break;
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case 1: act = SIG_IGN; break;
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default: act = handle_signal; break;
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}
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#ifdef POSIX_SIGNALS
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sigact.sa_handler = act;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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if (sigaction(signo, &sigact, &oldsigact) == -1) return -1;
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oldact = oldsigact.sa_handler;
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#else
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oldact = signal(signo, act);
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if (oldact == SIG_ERR) return -1;
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#endif
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if (oldact == handle_signal)
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return 2;
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else if (oldact == SIG_IGN)
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return 1;
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else
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return 0;
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}
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