Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

1131 lines (1026 sloc) 22.321 kb
/**********************************************************************
signal.c -
$Author: mame $
created at: Tue Dec 20 10:13:44 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/signal.h"
#include "ruby/node.h"
#include "vm_core.h"
#include <signal.h>
#include <stdio.h>
#ifdef __BEOS__
#undef SIGBUS
#endif
#if defined HAVE_SIGPROCMASK || defined HAVE_SIGSETMASK
#define USE_TRAP_MASK 1
#else
#define USE_TRAP_MASK 0
#endif
#ifndef NSIG
# ifdef DJGPP
# define NSIG SIGMAX
# else
# define NSIG (_SIGMAX + 1) /* For QNX */
# endif
#endif
static const struct signals {
const char *signm;
int signo;
} siglist [] = {
{"EXIT", 0},
#ifdef SIGHUP
{"HUP", SIGHUP},
#endif
{"INT", SIGINT},
#ifdef SIGQUIT
{"QUIT", SIGQUIT},
#endif
#ifdef SIGILL
{"ILL", SIGILL},
#endif
#ifdef SIGTRAP
{"TRAP", SIGTRAP},
#endif
#ifdef SIGIOT
{"IOT", SIGIOT},
#endif
#ifdef SIGABRT
{"ABRT", SIGABRT},
#endif
#ifdef SIGEMT
{"EMT", SIGEMT},
#endif
#ifdef SIGFPE
{"FPE", SIGFPE},
#endif
#ifdef SIGKILL
{"KILL", SIGKILL},
#endif
#ifdef SIGBUS
{"BUS", SIGBUS},
#endif
#ifdef SIGSEGV
{"SEGV", SIGSEGV},
#endif
#ifdef SIGSYS
{"SYS", SIGSYS},
#endif
#ifdef SIGPIPE
{"PIPE", SIGPIPE},
#endif
#ifdef SIGALRM
{"ALRM", SIGALRM},
#endif
#ifdef SIGTERM
{"TERM", SIGTERM},
#endif
#ifdef SIGURG
{"URG", SIGURG},
#endif
#ifdef SIGSTOP
{"STOP", SIGSTOP},
#endif
#ifdef SIGTSTP
{"TSTP", SIGTSTP},
#endif
#ifdef SIGCONT
{"CONT", SIGCONT},
#endif
#ifdef SIGCHLD
{"CHLD", SIGCHLD},
#endif
#ifdef SIGCLD
{"CLD", SIGCLD},
#else
# ifdef SIGCHLD
{"CLD", SIGCHLD},
# endif
#endif
#ifdef SIGTTIN
{"TTIN", SIGTTIN},
#endif
#ifdef SIGTTOU
{"TTOU", SIGTTOU},
#endif
#ifdef SIGIO
{"IO", SIGIO},
#endif
#ifdef SIGXCPU
{"XCPU", SIGXCPU},
#endif
#ifdef SIGXFSZ
{"XFSZ", SIGXFSZ},
#endif
#ifdef SIGVTALRM
{"VTALRM", SIGVTALRM},
#endif
#ifdef SIGPROF
{"PROF", SIGPROF},
#endif
#ifdef SIGWINCH
{"WINCH", SIGWINCH},
#endif
#ifdef SIGUSR1
{"USR1", SIGUSR1},
#endif
#ifdef SIGUSR2
{"USR2", SIGUSR2},
#endif
#ifdef SIGLOST
{"LOST", SIGLOST},
#endif
#ifdef SIGMSG
{"MSG", SIGMSG},
#endif
#ifdef SIGPWR
{"PWR", SIGPWR},
#endif
#ifdef SIGPOLL
{"POLL", SIGPOLL},
#endif
#ifdef SIGDANGER
{"DANGER", SIGDANGER},
#endif
#ifdef SIGMIGRATE
{"MIGRATE", SIGMIGRATE},
#endif
#ifdef SIGPRE
{"PRE", SIGPRE},
#endif
#ifdef SIGGRANT
{"GRANT", SIGGRANT},
#endif
#ifdef SIGRETRACT
{"RETRACT", SIGRETRACT},
#endif
#ifdef SIGSOUND
{"SOUND", SIGSOUND},
#endif
#ifdef SIGINFO
{"INFO", SIGINFO},
#endif
{NULL, 0}
};
static int
signm2signo(const char *nm)
{
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (strcmp(sigs->signm, nm) == 0)
return sigs->signo;
return 0;
}
static const char*
signo2signm(int no)
{
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (sigs->signo == no)
return sigs->signm;
return 0;
}
const char *
ruby_signal_name(int no)
{
return signo2signm(no);
}
/*
* call-seq:
* SignalException.new(sig) => signal_exception
*
* Construct a new SignalException object. +sig+ should be a known
* signal name, or a signal number.
*/
static VALUE
esignal_init(int argc, VALUE *argv, VALUE self)
{
int argnum = 1;
VALUE sig = Qnil;
int signo;
const char *signm;
if (argc > 0) {
sig = rb_check_to_integer(argv[0], "to_int");
if (!NIL_P(sig)) argnum = 2;
else sig = argv[0];
}
if (argc < 1 || argnum < argc) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)",
argc, argnum);
}
if (argnum == 2) {
signo = NUM2INT(sig);
if (signo < 0 || signo > NSIG) {
rb_raise(rb_eArgError, "invalid signal number (%d)", signo);
}
if (argc > 1) {
sig = argv[1];
}
else {
signm = signo2signm(signo);
if (signm) {
sig = rb_sprintf("SIG%s", signm);
}
else {
sig = rb_sprintf("SIG%u", signo);
}
}
}
else {
signm = SYMBOL_P(sig) ? rb_sym2name(sig) : StringValuePtr(sig);
if (strncmp(signm, "SIG", 3) == 0) signm += 3;
signo = signm2signo(signm);
if (!signo) {
rb_raise(rb_eArgError, "unsupported name `SIG%s'", signm);
}
sig = rb_sprintf("SIG%s", signm);
}
rb_call_super(1, &sig);
rb_iv_set(self, "signo", INT2NUM(signo));
return self;
}
/*
* call-seq:
* signal_exception.signo => num
*
* Returns a signal number.
*/
static VALUE
esignal_signo(VALUE self)
{
return rb_iv_get(self, "signo");
}
static VALUE
interrupt_init(int argc, VALUE *argv, VALUE self)
{
VALUE args[2];
args[0] = INT2FIX(SIGINT);
rb_scan_args(argc, argv, "01", &args[1]);
return rb_call_super(2, args);
}
void
ruby_default_signal(int sig)
{
#ifndef MACOS_UNUSE_SIGNAL
signal(sig, SIG_DFL);
raise(sig);
#endif
}
/*
* call-seq:
* Process.kill(signal, pid, ...) => fixnum
*
* Sends the given signal to the specified process id(s), or to the
* current process if _pid_ is zero. _signal_ may be an
* integer signal number or a POSIX signal name (either with or without
* a +SIG+ prefix). If _signal_ is negative (or starts
* with a minus sign), kills process groups instead of
* processes. Not all signals are available on all platforms.
*
* pid = fork do
* Signal.trap("HUP") { puts "Ouch!"; exit }
* # ... do some work ...
* end
* # ...
* Process.kill("HUP", pid)
* Process.wait
*
* <em>produces:</em>
*
* Ouch!
*/
VALUE
rb_f_kill(int argc, VALUE *argv)
{
#ifndef HAS_KILLPG
#define killpg(pg, sig) kill(-(pg), sig)
#endif
int negative = 0;
int sig;
int i;
const char *s;
rb_secure(2);
if (argc < 2)
rb_raise(rb_eArgError, "wrong number of arguments -- kill(sig, pid...)");
switch (TYPE(argv[0])) {
case T_FIXNUM:
sig = FIX2INT(argv[0]);
break;
case T_SYMBOL:
s = rb_sym2name(argv[0]);
if (!s) rb_raise(rb_eArgError, "bad signal");
goto str_signal;
case T_STRING:
s = RSTRING_PTR(argv[0]);
if (s[0] == '-') {
negative++;
s++;
}
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
if((sig = signm2signo(s)) == 0)
rb_raise(rb_eArgError, "unsupported name `SIG%s'", s);
if (negative)
sig = -sig;
break;
default:
{
VALUE str;
str = rb_check_string_type(argv[0]);
if (!NIL_P(str)) {
s = RSTRING_PTR(str);
goto str_signal;
}
rb_raise(rb_eArgError, "bad signal type %s",
rb_obj_classname(argv[0]));
}
break;
}
if (sig < 0) {
sig = -sig;
for (i=1; i<argc; i++) {
if (killpg(NUM2PIDT(argv[i]), sig) < 0)
rb_sys_fail(0);
}
}
else {
for (i=1; i<argc; i++) {
if (kill(NUM2PIDT(argv[i]), sig) < 0)
rb_sys_fail(0);
}
}
rb_thread_polling();
return INT2FIX(i-1);
}
static struct {
VALUE cmd;
} trap_list[NSIG];
static rb_atomic_t trap_pending_list[NSIG];
#if 0
static char rb_trap_accept_nativethreads[NSIG];
#endif
rb_atomic_t rb_trap_pending;
rb_atomic_t rb_trap_immediate;
int rb_prohibit_interrupt = 1;
VALUE
rb_get_trap_cmd(int sig)
{
return trap_list[sig].cmd;
}
void
rb_gc_mark_trap_list(void)
{
#ifndef MACOS_UNUSE_SIGNAL
int i;
for (i=0; i<NSIG; i++) {
if (trap_list[i].cmd)
rb_gc_mark(trap_list[i].cmd);
}
#endif /* MACOS_UNUSE_SIGNAL */
}
#ifdef __dietlibc__
#define sighandler_t sh_t
#endif
typedef RETSIGTYPE (*sighandler_t)(int);
#ifdef POSIX_SIGNAL
static sighandler_t
ruby_signal(int signum, sighandler_t handler)
{
struct sigaction sigact, old;
#if 0
rb_trap_accept_nativethreads[signum] = 0;
#endif
sigemptyset(&sigact.sa_mask);
#ifdef SA_SIGINFO
sigact.sa_sigaction = (void (*)(int, siginfo_t*, void*))handler;
sigact.sa_flags = SA_SIGINFO;
#else
sigact.sa_handler = handler;
sigact.sa_flags = 0;
#endif
#ifdef SA_NOCLDWAIT
if (signum == SIGCHLD && handler == SIG_IGN)
sigact.sa_flags |= SA_NOCLDWAIT;
#endif
sigaction(signum, &sigact, &old);
return old.sa_handler;
}
sighandler_t
posix_signal(int signum, sighandler_t handler)
{
return ruby_signal(signum, handler);
}
#else /* !POSIX_SIGNAL */
#define ruby_signal(sig,handler) (/* rb_trap_accept_nativethreads[sig] = 0,*/ signal((sig),(handler)))
#if 0 /* def HAVE_NATIVETHREAD */
static sighandler_t
ruby_nativethread_signal(int signum, sighandler_t handler)
{
sighandler_t old;
old = signal(signum, handler);
rb_trap_accept_nativethreads[signum] = 1;
return old;
}
#endif
#endif
static RETSIGTYPE
sighandler(int sig)
{
rb_vm_t *vm = GET_VM(); /* fix me for Multi-VM */
ATOMIC_INC(vm->signal_buff[sig]);
ATOMIC_INC(vm->buffered_signal_size);
#if !defined(BSD_SIGNAL) && !defined(POSIX_SIGNAL)
ruby_signal(sig, sighandler);
#endif
}
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
static sigset_t trap_last_mask;
# else
static int trap_last_mask;
# endif
#endif
#if HAVE_PTHREAD_H
#include <pthread.h>
#endif
void
rb_disable_interrupt(void)
{
#ifndef _WIN32
sigset_t mask;
sigfillset(&mask);
sigdelset(&mask, SIGVTALRM);
sigdelset(&mask, SIGSEGV);
pthread_sigmask(SIG_SETMASK, &mask, NULL);
#endif
}
void
rb_enable_interrupt(void)
{
#ifndef _WIN32
sigset_t mask;
sigemptyset(&mask);
pthread_sigmask(SIG_SETMASK, &mask, NULL);
#endif
}
int
rb_get_next_signal(rb_vm_t *vm)
{
int i, sig = 0;
for (i=1; i<RUBY_NSIG; i++) {
if (vm->signal_buff[i] > 0) {
rb_disable_interrupt();
{
ATOMIC_DEC(vm->signal_buff[i]);
ATOMIC_DEC(vm->buffered_signal_size);
}
rb_enable_interrupt();
sig = i;
break;
}
}
return sig;
}
#ifdef SIGBUS
static RETSIGTYPE
sigbus(int sig)
{
rb_bug("Bus Error");
}
#endif
#ifdef SIGSEGV
static int segv_received = 0;
static RETSIGTYPE
sigsegv(int sig)
{
if (segv_received) {
fprintf(stderr, "SEGV recieved in SEGV handler\n");
exit(1);
}
else {
extern int ruby_gc_stress;
segv_received = 1;
ruby_gc_stress = 0;
rb_bug("Segmentation fault");
}
}
#endif
#ifdef SIGPIPE
static RETSIGTYPE
sigpipe(int sig)
{
/* do nothing */
}
#endif
static void
signal_exec(VALUE cmd, int sig)
{
rb_proc_t *proc;
VALUE signum = INT2FIX(sig);
GetProcPtr(cmd, proc);
vm_invoke_proc(GET_THREAD(), proc, proc->block.self, 1, &signum, 0);
}
void
rb_trap_exit(void)
{
#ifndef MACOS_UNUSE_SIGNAL
if (trap_list[0].cmd) {
VALUE trap_exit = trap_list[0].cmd;
trap_list[0].cmd = 0;
signal_exec(trap_exit, 0);
}
#endif
}
void
rb_signal_exec(rb_thread_t *th, int sig)
{
VALUE cmd = rb_get_trap_cmd(sig);
if (cmd == 0) {
switch (sig) {
case SIGINT:
rb_interrupt();
break;
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGTERM
case SIGTERM:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
rb_thread_signal_raise(th, sig);
break;
}
}
else if (cmd == Qundef) {
rb_thread_signal_exit(th);
}
else {
signal_exec(cmd, sig);
}
}
void
rb_trap_exec(void)
{
#ifndef MACOS_UNUSE_SIGNAL
int i;
for (i=0; i<NSIG; i++) {
if (trap_pending_list[i]) {
trap_pending_list[i] = 0;
rb_signal_exec(GET_THREAD(), i);
}
}
#endif /* MACOS_UNUSE_SIGNAL */
rb_trap_pending = 0;
}
struct trap_arg {
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
sigset_t mask;
# else
int mask;
# endif
#endif
int sig;
sighandler_t func;
VALUE cmd;
};
static sighandler_t
default_handler(int sig)
{
sighandler_t func;
switch (sig) {
case SIGINT:
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGTERM
case SIGTERM:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
func = sighandler;
break;
#ifdef SIGBUS
case SIGBUS:
func = sigbus;
break;
#endif
#ifdef SIGSEGV
case SIGSEGV:
func = sigsegv;
break;
#endif
#ifdef SIGPIPE
case SIGPIPE:
func = sigpipe;
break;
#endif
default:
func = SIG_DFL;
break;
}
return func;
}
static RETSIGTYPE
wrong_trap(int sig)
{
}
static sighandler_t
trap_handler(VALUE *cmd, int sig)
{
sighandler_t func = wrong_trap;
VALUE command;
if (NIL_P(*cmd)) {
func = SIG_IGN;
}
else {
command = rb_check_string_type(*cmd);
if (!NIL_P(command)) {
SafeStringValue(command); /* taint check */
switch (RSTRING_LEN(command)) {
case 0:
goto sig_ign;
break;
case 14:
if (strncmp(RSTRING_PTR(command), "SYSTEM_DEFAULT", 14) == 0) {
func = SIG_DFL;
*cmd = 0;
}
break;
case 7:
if (strncmp(RSTRING_PTR(command), "SIG_IGN", 7) == 0) {
sig_ign:
func = SIG_IGN;
*cmd = 0;
}
else if (strncmp(RSTRING_PTR(command), "SIG_DFL", 7) == 0) {
sig_dfl:
func = default_handler(sig);
*cmd = 0;
}
else if (strncmp(RSTRING_PTR(command), "DEFAULT", 7) == 0) {
goto sig_dfl;
}
break;
case 6:
if (strncmp(RSTRING_PTR(command), "IGNORE", 6) == 0) {
goto sig_ign;
}
break;
case 4:
if (strncmp(RSTRING_PTR(command), "EXIT", 4) == 0) {
func = sighandler;
*cmd = Qundef;
}
break;
}
if (func == wrong_trap) {
rb_raise(rb_eArgError, "wrong trap - %s", RSTRING_PTR(command));
}
}
else {
rb_proc_t *proc;
GetProcPtr(*cmd, proc);
func = sighandler;
}
}
return func;
}
static int
trap_signm(VALUE vsig)
{
int sig = -1;
const char *s;
switch (TYPE(vsig)) {
case T_FIXNUM:
sig = FIX2INT(vsig);
if (sig < 0 || sig >= NSIG) {
rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
}
break;
case T_SYMBOL:
s = rb_sym2name(vsig);
if (!s) rb_raise(rb_eArgError, "bad signal");
goto str_signal;
default:
s = StringValuePtr(vsig);
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
sig = signm2signo(s);
if (sig == 0 && strcmp(s, "EXIT") != 0)
rb_raise(rb_eArgError, "unsupported signal SIG%s", s);
}
return sig;
}
static VALUE
trap(struct trap_arg *arg)
{
sighandler_t oldfunc, func = arg->func;
VALUE oldcmd, command = arg->cmd;
int sig = arg->sig;
oldfunc = ruby_signal(sig, func);
oldcmd = trap_list[sig].cmd;
switch (oldcmd) {
case 0:
if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
else oldcmd = Qnil;
break;
case Qundef:
oldcmd = rb_str_new2("EXIT");
break;
}
trap_list[sig].cmd = command;
/* enable at least specified signal. */
#if USE_TRAP_MASK
#ifdef HAVE_SIGPROCMASK
sigdelset(&arg->mask, sig);
#else
arg->mask &= ~sigmask(sig);
#endif
#endif
return oldcmd;
}
#if USE_TRAP_MASK
static VALUE
trap_ensure(struct trap_arg *arg)
{
/* enable interrupt */
#ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_SETMASK, &arg->mask, NULL);
#else
sigsetmask(arg->mask);
#endif
trap_last_mask = arg->mask;
return 0;
}
#endif
void
rb_trap_restore_mask(void)
{
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_SETMASK, &trap_last_mask, NULL);
# else
sigsetmask(trap_last_mask);
# endif
#endif
}
/*
* call-seq:
* Signal.trap( signal, command ) => obj
* Signal.trap( signal ) {| | block } => obj
*
* Specifies the handling of signals. The first parameter is a signal
* name (a string such as ``SIGALRM'', ``SIGUSR1'', and so on) or a
* signal number. The characters ``SIG'' may be omitted from the
* signal name. The command or block specifies code to be run when the
* signal is raised.
* If the command is the string ``IGNORE'' or ``SIG_IGN'', the signal
* will be ignored.
* If the command is ``DEFAULT'' or ``SIG_DFL'', the Ruby's default handler
* will be invoked.
* If the command is ``EXIT'', the script will be terminated by the signal.
* If the command is ``SYSTEM_DEFAULT'', the operating system's default
* handler will be invoked.
* Otherwise, the given command or block will be run.
* The special signal name ``EXIT'' or signal number zero will be
* invoked just prior to program termination.
* trap returns the previous handler for the given signal.
*
* Signal.trap(0, proc { puts "Terminating: #{$$}" })
* Signal.trap("CLD") { puts "Child died" }
* fork && Process.wait
*
* produces:
* Terminating: 27461
* Child died
* Terminating: 27460
*/
static VALUE
sig_trap(int argc, VALUE *argv)
{
struct trap_arg arg;
rb_secure(2);
if (argc == 0 || argc > 2) {
rb_raise(rb_eArgError, "wrong number of arguments -- trap(sig, cmd)/trap(sig){...}");
}
arg.sig = trap_signm(argv[0]);
if (argc == 1) {
arg.cmd = rb_block_proc();
arg.func = sighandler;
}
else if (argc == 2) {
arg.cmd = argv[1];
arg.func = trap_handler(&arg.cmd, arg.sig);
}
if (OBJ_TAINTED(arg.cmd)) {
rb_raise(rb_eSecurityError, "Insecure: tainted signal trap");
}
#if USE_TRAP_MASK
/* disable interrupt */
# ifdef HAVE_SIGPROCMASK
sigfillset(&arg.mask);
sigprocmask(SIG_BLOCK, &arg.mask, &arg.mask);
# else
arg.mask = sigblock(~0);
# endif
return rb_ensure(trap, (VALUE)&arg, trap_ensure, (VALUE)&arg);
#else
return trap(&arg);
#endif
}
/*
* call-seq:
* Signal.list => a_hash
*
* Returns a list of signal names mapped to the corresponding
* underlying signal numbers.
*
* Signal.list #=> {"ABRT"=>6, "ALRM"=>14, "BUS"=>7, "CHLD"=>17, "CLD"=>17, "CONT"=>18, "FPE"=>8, "HUP"=>1, "ILL"=>4, "INT"=>2, "IO"=>29, "IOT"=>6, "KILL"=>9, "PIPE"=>13, "POLL"=>29, "PROF"=>27, "PWR"=>30, "QUIT"=>3, "SEGV"=>11, "STOP"=>19, "SYS"=>31, "TERM"=>15, "TRAP"=>5, "TSTP"=>20, "TTIN"=>21, "TTOU"=>22, "URG"=>23, "USR1"=>10, "USR2"=>12, "VTALRM"=>26, "WINCH"=>28, "XCPU"=>24, "XFSZ"=>25}
*/
static VALUE
sig_list(void)
{
VALUE h = rb_hash_new();
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++) {
rb_hash_aset(h, rb_str_new2(sigs->signm), INT2FIX(sigs->signo));
}
return h;
}
static void
install_sighandler(int signum, sighandler_t handler)
{
sighandler_t old;
old = ruby_signal(signum, handler);
if (old != SIG_DFL) {
ruby_signal(signum, old);
}
}
#if defined(SIGCLD) || defined(SIGCHLD)
static void
init_sigchld(int sig)
{
sighandler_t oldfunc;
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
sigset_t mask;
# else
int mask;
# endif
#endif
#if USE_TRAP_MASK
/* disable interrupt */
# ifdef HAVE_SIGPROCMASK
sigfillset(&mask);
sigprocmask(SIG_BLOCK, &mask, &mask);
# else
mask = sigblock(~0);
# endif
#endif
oldfunc = ruby_signal(sig, SIG_DFL);
if (oldfunc != SIG_DFL && oldfunc != SIG_IGN) {
ruby_signal(sig, oldfunc);
} else {
trap_list[sig].cmd = 0;
}
#if USE_TRAP_MASK
#ifdef HAVE_SIGPROCMASK
sigdelset(&mask, sig);
sigprocmask(SIG_SETMASK, &mask, NULL);
#else
mask &= ~sigmask(sig);
sigsetmask(mask);
#endif
trap_last_mask = mask;
#endif
}
#endif
void
ruby_sig_finalize()
{
sighandler_t oldfunc;
oldfunc = ruby_signal(SIGINT, SIG_IGN);
if (oldfunc == sighandler) {
ruby_signal(SIGINT, SIG_DFL);
}
}
#ifdef RUBY_DEBUG_ENV
int ruby_enable_coredump = 0;
#endif
/*
* Many operating systems allow signals to be sent to running
* processes. Some signals have a defined effect on the process, while
* others may be trapped at the code level and acted upon. For
* example, your process may trap the USR1 signal and use it to toggle
* debugging, and may use TERM to initiate a controlled shutdown.
*
* pid = fork do
* Signal.trap("USR1") do
* $debug = !$debug
* puts "Debug now: #$debug"
* end
* Signal.trap("TERM") do
* puts "Terminating..."
* shutdown()
* end
* # . . . do some work . . .
* end
*
* Process.detach(pid)
*
* # Controlling program:
* Process.kill("USR1", pid)
* # ...
* Process.kill("USR1", pid)
* # ...
* Process.kill("TERM", pid)
*
* produces:
* Debug now: true
* Debug now: false
* Terminating...
*
* The list of available signal names and their interpretation is
* system dependent. Signal delivery semantics may also vary between
* systems; in particular signal delivery may not always be reliable.
*/
void
Init_signal(void)
{
#ifndef MACOS_UNUSE_SIGNAL
VALUE mSignal = rb_define_module("Signal");
rb_define_global_function("trap", sig_trap, -1);
rb_define_module_function(mSignal, "trap", sig_trap, -1);
rb_define_module_function(mSignal, "list", sig_list, 0);
rb_define_method(rb_eSignal, "initialize", esignal_init, -1);
rb_define_method(rb_eSignal, "signo", esignal_signo, 0);
rb_alias(rb_eSignal, rb_intern("signm"), rb_intern("message"));
rb_define_method(rb_eInterrupt, "initialize", interrupt_init, -1);
install_sighandler(SIGINT, sighandler);
#ifdef SIGHUP
install_sighandler(SIGHUP, sighandler);
#endif
#ifdef SIGQUIT
install_sighandler(SIGQUIT, sighandler);
#endif
#ifdef SIGTERM
install_sighandler(SIGTERM, sighandler);
#endif
#ifdef SIGALRM
install_sighandler(SIGALRM, sighandler);
#endif
#ifdef SIGUSR1
install_sighandler(SIGUSR1, sighandler);
#endif
#ifdef SIGUSR2
install_sighandler(SIGUSR2, sighandler);
#endif
#ifdef RUBY_DEBUG_ENV
if (!ruby_enable_coredump)
#endif
{
#ifdef SIGBUS
install_sighandler(SIGBUS, sigbus);
#endif
#ifdef SIGSEGV
install_sighandler(SIGSEGV, sigsegv);
#endif
}
#ifdef SIGPIPE
install_sighandler(SIGPIPE, sigpipe);
#endif
#if defined(SIGCLD)
init_sigchld(SIGCLD);
#elif defined(SIGCHLD)
init_sigchld(SIGCHLD);
#endif
#endif /* MACOS_UNUSE_SIGNAL */
}
Jump to Line
Something went wrong with that request. Please try again.