296 lines
7.7 KiB
C
296 lines
7.7 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../LICENSE. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <signal.h>
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#include "alloc.h"
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#include "callback.h"
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#include "config.h"
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#include "fail.h"
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#include "memory.h"
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#include "misc.h"
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#include "mlvalues.h"
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#include "roots.h"
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#include "signals.h"
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#include "sys.h"
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#if macintosh
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#include "rotatecursor.h"
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#endif /* macintosh */
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#ifdef _WIN32
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typedef void (*sighandler)(int sig);
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extern sighandler win32_signal(int sig, sighandler action);
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#define signal(sig,act) win32_signal(sig,act)
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#endif
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int volatile async_signal_mode = 0;
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int volatile pending_signal = 0;
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int volatile something_to_do = 0;
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int volatile force_major_slice = 0;
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value signal_handlers = 0;
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void (*enter_blocking_section_hook)(void) = NULL;
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void (*leave_blocking_section_hook)(void) = NULL;
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void (* volatile async_action_hook)(void) = NULL;
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void process_event(void)
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{
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int signal_number;
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void (*async_action)(void);
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if (force_major_slice) minor_collection (); /* FIXME should be check_urgent_gc */
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/* If a signal arrives between the following two instructions,
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it will be lost. To do: use atomic swap or atomic read-and-clear
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for processors that support it? */
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signal_number = pending_signal;
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pending_signal = 0;
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if (signal_number) execute_signal(signal_number, 0);
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/* If an async action is scheduled between the following two instructions,
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it will be lost. */
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async_action = async_action_hook;
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async_action_hook = NULL;
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if (async_action != NULL) (*async_action)();
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#if macintosh
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ROTATECURSOR_MAGIC ();
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#endif
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}
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static int rev_convert_signal_number(int signo);
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void execute_signal(int signal_number, int in_signal_handler)
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{
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value res;
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#ifdef POSIX_SIGNALS
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sigset_t sigs;
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/* Block the signal before executing the handler, and record in sigs
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the original signal mask */
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sigemptyset(&sigs);
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sigaddset(&sigs, signal_number);
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sigprocmask(SIG_BLOCK, &sigs, &sigs);
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#endif
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res = callback_exn(Field(signal_handlers, signal_number),
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Val_int(rev_convert_signal_number(signal_number)));
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#ifdef POSIX_SIGNALS
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if (! in_signal_handler) {
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/* Restore the original signal mask */
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sigprocmask(SIG_SETMASK, &sigs, NULL);
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} else if (Is_exception_result(res)) {
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/* Restore the original signal mask and unblock the signal itself */
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sigdelset(&sigs, signal_number);
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sigprocmask(SIG_SETMASK, &sigs, NULL);
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}
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#endif
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if (Is_exception_result(res)) mlraise(Extract_exception(res));
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}
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void handle_signal(int signal_number)
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{
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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 (async_signal_mode){
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leave_blocking_section ();
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execute_signal(signal_number, 1);
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enter_blocking_section ();
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}else{
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pending_signal = signal_number;
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something_to_do = 1;
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}
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}
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void urge_major_slice (void)
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{
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force_major_slice = 1;
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something_to_do = 1;
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}
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CAMLexport void enter_blocking_section(void)
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{
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int temp;
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while (1){
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Assert (!async_signal_mode);
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/* If a signal arrives between the next two instructions,
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it will be lost. */
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temp = pending_signal; pending_signal = 0;
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if (temp) execute_signal(temp, 0);
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async_signal_mode = 1;
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if (!pending_signal) break;
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async_signal_mode = 0;
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}
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if (enter_blocking_section_hook != NULL) enter_blocking_section_hook();
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}
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CAMLexport void leave_blocking_section(void)
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{
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#ifdef _WIN32
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int signal_number;
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#endif
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if (leave_blocking_section_hook != NULL) leave_blocking_section_hook();
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#ifdef _WIN32
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/* Under Win32, asynchronous signals such as ctrl-C are not processed
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immediately (see ctrl_handler in win32.c), but simply set
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pending_signal and let the system call run to completion.
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Hence, test pending_signal here and act upon it, before we get
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a chance to process the result of the system call. */
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signal_number = pending_signal;
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pending_signal = 0;
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if (signal_number) execute_signal(signal_number, 1);
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#endif
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Assert(async_signal_mode);
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async_signal_mode = 0;
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}
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#ifndef SIGABRT
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#define SIGABRT -1
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#endif
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#ifndef SIGALRM
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#define SIGALRM -1
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#endif
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#ifndef SIGFPE
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#define SIGFPE -1
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#endif
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#ifndef SIGHUP
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#define SIGHUP -1
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#endif
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#ifndef SIGILL
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#define SIGILL -1
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#endif
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#ifndef SIGINT
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#define SIGINT -1
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#endif
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#ifndef SIGKILL
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#define SIGKILL -1
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#endif
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#ifndef SIGPIPE
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#define SIGPIPE -1
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#endif
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#ifndef SIGQUIT
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#define SIGQUIT -1
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#endif
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#ifndef SIGSEGV
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#define SIGSEGV -1
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#endif
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#ifndef SIGTERM
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#define SIGTERM -1
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#endif
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#ifndef SIGUSR1
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#define SIGUSR1 -1
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#endif
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#ifndef SIGUSR2
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#define SIGUSR2 -1
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#endif
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#ifndef SIGCHLD
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#define SIGCHLD -1
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#endif
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#ifndef SIGCONT
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#define SIGCONT -1
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#endif
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#ifndef SIGSTOP
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#define SIGSTOP -1
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#endif
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#ifndef SIGTSTP
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#define SIGTSTP -1
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#endif
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#ifndef SIGTTIN
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#define SIGTTIN -1
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#endif
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#ifndef SIGTTOU
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#define SIGTTOU -1
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#endif
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#ifndef SIGVTALRM
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#define SIGVTALRM -1
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#endif
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#ifndef SIGPROF
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#define SIGPROF -1
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#endif
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static int posix_signals[] = {
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SIGABRT, SIGALRM, SIGFPE, SIGHUP, SIGILL, SIGINT, SIGKILL, SIGPIPE,
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SIGQUIT, SIGSEGV, SIGTERM, SIGUSR1, SIGUSR2, SIGCHLD, SIGCONT,
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SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU, SIGVTALRM, SIGPROF
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};
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CAMLexport int convert_signal_number(int signo)
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{
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if (signo < 0 && signo >= -(sizeof(posix_signals) / sizeof(int)))
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return posix_signals[-signo-1];
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else
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return signo;
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}
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static int rev_convert_signal_number(int signo)
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{
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int i;
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for (i = 0; i < sizeof(posix_signals) / sizeof(int); i++)
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if (signo == posix_signals[i]) return -i - 1;
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return signo;
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}
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#ifndef NSIG
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#define NSIG 64
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#endif
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CAMLprim value install_signal_handler(value signal_number, value action)
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{
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CAMLparam2 (signal_number, action);
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int sig;
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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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CAMLlocal1 (res);
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sig = convert_signal_number(Int_val(signal_number));
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if (sig < 0 || sig >= NSIG)
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invalid_argument("Sys.signal: unavailable signal");
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switch(action) {
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case Val_int(0): /* Signal_default */
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act = SIG_DFL;
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break;
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case Val_int(1): /* Signal_ignore */
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act = SIG_IGN;
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break;
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default: /* Signal_handle */
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act = handle_signal;
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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(sig, &sigact, &oldsigact) == -1) caml_sys_error(NO_ARG);
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oldact = oldsigact.sa_handler;
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#else
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oldact = signal(sig, act);
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if (oldact == SIG_ERR) caml_sys_error(NO_ARG);
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#endif
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if (oldact == handle_signal) {
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res = alloc_small (1, 0); /* Signal_handle */
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Field(res, 0) = Field(signal_handlers, sig);
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}
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else if (oldact == SIG_IGN)
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res = Val_int(1); /* Signal_ignore */
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else
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res = Val_int(0); /* Signal_default */
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if (Is_block(action)) {
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if (signal_handlers == 0) {
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signal_handlers = alloc(NSIG, 0);
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register_global_root(&signal_handlers);
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}
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modify(&Field(signal_handlers, sig), Field(action, 0));
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}
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CAMLreturn (res);
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}
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