221 lines
5.1 KiB
C
221 lines
5.1 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. Distributed only by permission. */
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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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volatile int async_signal_mode = 0;
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volatile int pending_signal = 0;
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volatile int something_to_do = 0;
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volatile int force_major_slice = 0;
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value signal_handlers = 0;
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void (*enter_blocking_section_hook)() = NULL;
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void (*leave_blocking_section_hook)() = NULL;
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static void execute_signal(int signal_number)
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{
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Assert (!async_signal_mode);
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callback(Field(signal_handlers, signal_number), Val_int(signal_number));
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}
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void handle_signal(int signal_number)
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{
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#ifndef POSIX_SIGNALS
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#ifndef BSD_SIGNALS
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signal(signal_number, handle_signal);
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#endif
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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);
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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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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);
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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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void leave_blocking_section(void)
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{
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if (leave_blocking_section_hook != NULL) leave_blocking_section_hook();
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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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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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#ifndef NSIG
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#define NSIG 32
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#endif
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value install_signal_handler(value signal_number, value action) /* ML */
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{
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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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value 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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if (signal_handlers == 0) {
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int i;
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Begin_root(action);
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signal_handlers = alloc_tuple(NSIG);
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End_roots();
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for (i = 0; i < NSIG; i++) Field(signal_handlers, i) = Val_int(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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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) 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) 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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return res;
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}
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