зеркало из https://github.com/github/ruby.git
1086 строки
21 KiB
C
1086 строки
21 KiB
C
/**********************************************************************
|
|
|
|
signal.c -
|
|
|
|
$Author$
|
|
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 "vm_core.h"
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
|
|
#ifdef _WIN32
|
|
typedef LONG rb_atomic_t;
|
|
|
|
# define ATOMIC_TEST(var) InterlockedExchange(&(var), 0)
|
|
# define ATOMIC_SET(var, val) InterlockedExchange(&(var), (val))
|
|
# define ATOMIC_INC(var) InterlockedIncrement(&(var))
|
|
# define ATOMIC_DEC(var) InterlockedDecrement(&(var))
|
|
|
|
#else
|
|
typedef int rb_atomic_t;
|
|
|
|
# define ATOMIC_TEST(var) ((var) ? ((var) = 0, 1) : 0)
|
|
# define ATOMIC_SET(var, val) ((var) = (val))
|
|
# define ATOMIC_INC(var) (++(var))
|
|
# define ATOMIC_DEC(var) (--(var))
|
|
#endif
|
|
|
|
#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
|
|
# define NSIG (_SIGMAX + 1) /* For QNX */
|
|
#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_id2name(SYM2ID(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)
|
|
{
|
|
signal(sig, SIG_DFL);
|
|
raise(sig);
|
|
}
|
|
|
|
/*
|
|
* 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_id2name(SYM2ID(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);
|
|
}
|
|
|
|
struct {
|
|
rb_atomic_t cnt[RUBY_NSIG];
|
|
rb_atomic_t size;
|
|
} signal_buff;
|
|
|
|
#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)
|
|
{
|
|
ATOMIC_INC(signal_buff.cnt[sig]);
|
|
ATOMIC_INC(signal_buff.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(void)
|
|
{
|
|
int i, sig = 0;
|
|
|
|
for (i=1; i<RUBY_NSIG; i++) {
|
|
if (signal_buff.cnt[i] > 0) {
|
|
rb_disable_interrupt();
|
|
{
|
|
ATOMIC_DEC(signal_buff.cnt[i]);
|
|
ATOMIC_DEC(signal_buff.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(EXIT_FAILURE);
|
|
}
|
|
else {
|
|
extern int ruby_disable_gc_stress;
|
|
segv_received = 1;
|
|
ruby_disable_gc_stress = 1;
|
|
rb_bug("Segmentation fault");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef SIGPIPE
|
|
static RETSIGTYPE
|
|
sigpipe(int sig)
|
|
{
|
|
/* do nothing */
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
signal_exec(VALUE cmd, int safe, int sig)
|
|
{
|
|
VALUE signum = INT2NUM(sig);
|
|
rb_eval_cmd(cmd, rb_ary_new3(1, signum), safe);
|
|
}
|
|
|
|
void
|
|
rb_trap_exit(void)
|
|
{
|
|
rb_vm_t *vm = GET_VM();
|
|
VALUE trap_exit = vm->trap_list[0].cmd;
|
|
|
|
if (trap_exit) {
|
|
vm->trap_list[0].cmd = 0;
|
|
signal_exec(trap_exit, vm->trap_list[0].safe, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
rb_signal_exec(rb_thread_t *th, int sig)
|
|
{
|
|
rb_vm_t *vm = GET_VM();
|
|
VALUE cmd = vm->trap_list[sig].cmd;
|
|
int safe = vm->trap_list[sig].safe;
|
|
|
|
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, safe, sig);
|
|
}
|
|
}
|
|
|
|
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 sighandler_t
|
|
trap_handler(VALUE *cmd, int sig)
|
|
{
|
|
sighandler_t func = sighandler;
|
|
VALUE command;
|
|
|
|
if (NIL_P(*cmd)) {
|
|
func = SIG_IGN;
|
|
}
|
|
else {
|
|
command = rb_check_string_type(*cmd);
|
|
if (!NIL_P(command)) {
|
|
SafeStringValue(command); /* taint check */
|
|
*cmd = command;
|
|
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) {
|
|
*cmd = Qundef;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
rb_proc_t *proc;
|
|
GetProcPtr(*cmd, proc);
|
|
}
|
|
}
|
|
|
|
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_id2name(SYM2ID(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;
|
|
rb_vm_t *vm = GET_VM();
|
|
|
|
oldfunc = ruby_signal(sig, func);
|
|
oldcmd = vm->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;
|
|
}
|
|
|
|
vm->trap_list[sig].cmd = command;
|
|
vm->trap_list[sig].safe = rb_safe_level();
|
|
/* 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 #=> {"EXIT"=>0, "HUP"=>1, "INT"=>2, "QUIT"=>3, "ILL"=>4, "TRAP"=>5, "IOT"=>6, "ABRT"=>6, "FPE"=>8, "KILL"=>9, "BUS"=>7, "SEGV"=>11, "SYS"=>31, "PIPE"=>13, "ALRM"=>14, "TERM"=>15, "URG"=>23, "STOP"=>19, "TSTP"=>20, "CONT"=>18, "CHLD"=>17, "CLD"=>17, "TTIN"=>21, "TTOU"=>22, "IO"=>29, "XCPU"=>24, "XFSZ"=>25, "VTALRM"=>26, "PROF"=>27, "WINCH"=>28, "USR1"=>10, "USR2"=>12, "PWR"=>30, "POLL"=>29}
|
|
*/
|
|
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 {
|
|
GET_VM()->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)
|
|
{
|
|
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
|
|
}
|