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ruby--ruby/signal.c
matz 46620a8772 matz 
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1039 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2000-11-14 07:10:31 +00:00

662 lines
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/**********************************************************************
signal.c -
$Author$
$Date$
created at: Tue Dec 20 10:13:44 JST 1994
Copyright (C) 1993-2000 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby.h"
#include "rubysig.h"
#include <signal.h>
#include <stdio.h>
#ifdef __BEOS__
#undef SIGBUS
#endif
#ifndef NSIG
# ifdef DJGPP
# define NSIG SIGMAX
# else
# define NSIG (_SIGMAX + 1) /* For QNX */
# endif
#endif
static struct signals {
char *signm;
int signo;
} siglist [] = {
#ifdef SIGHUP
"HUP", SIGHUP,
#endif
#ifdef SIGINT
"INT", SIGINT,
#endif
#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
NULL, 0,
};
static int
signm2signo(nm)
char *nm;
{
struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (strcmp(sigs->signm, nm) == 0)
return sigs->signo;
return 0;
}
static char*
signo2signm(no)
int no;
{
struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (sigs->signo == no)
return sigs->signm;
return 0;
}
VALUE
rb_f_kill(argc, argv)
int argc;
VALUE *argv;
{
int negative = 0;
int sig;
int i;
char *s;
rb_secure(2);
if (argc < 2)
rb_raise(rb_eArgError, "wrong # 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(argv[0])->ptr;
if (s[0] == '-') {
negative++;
s++;
}
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
if((sig = signm2signo(s)) == 0)
rb_raise(rb_eArgError, "unrecognized signal name `%s'", s);
if (negative)
sig = -sig;
}
break;
default:
rb_raise(rb_eArgError, "bad signal type %s",
rb_class2name(CLASS_OF(argv[0])));
break;
}
if (sig < 0) {
sig = -sig;
for (i=1; i<argc; i++) {
int pid = NUM2INT(argv[i]);
#ifdef HAS_KILLPG
if (killpg(pid, sig) < 0)
#else
if (kill(-pid, sig) < 0)
#endif
rb_sys_fail(0);
}
}
else {
for (i=1; i<argc; i++) {
Check_Type(argv[i], T_FIXNUM);
if (kill(FIX2UINT(argv[i]), sig) < 0)
rb_sys_fail(0);
}
}
return INT2FIX(i-1);
}
static VALUE trap_list[NSIG];
static rb_atomic_t trap_pending_list[NSIG];
rb_atomic_t rb_trap_pending;
rb_atomic_t rb_trap_immediate;
int rb_prohibit_interrupt;
void
rb_gc_mark_trap_list()
{
#ifndef MACOS_UNUSE_SIGNAL
int i;
for (i=0; i<NSIG; i++) {
if (trap_list[i])
rb_gc_mark(trap_list[i]);
}
#endif /* MACOS_UNUSE_SIGNAL */
}
#ifdef POSIX_SIGNAL
void
posix_signal(signum, handler)
int signum;
RETSIGTYPE (*handler)_((int));
{
struct sigaction sigact;
sigact.sa_handler = handler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
#ifdef SA_RESTART
sigact.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
#endif
#ifdef SA_NOCLDWAIT
if (signum == SIGCHLD && handler == SIG_IGN)
sigact.sa_flags |= SA_NOCLDWAIT;
#endif
sigaction(signum, &sigact, 0);
}
#define ruby_signal(sig,handle) posix_signal((sig),(handle))
#else
#define ruby_signal(sig,handle) signal((sig),(handle))
#endif
static void signal_exec _((int sig));
static void
signal_exec(sig)
int sig;
{
if (trap_list[sig] == 0) {
switch (sig) {
case SIGINT:
rb_thread_interrupt();
break;
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
rb_thread_signal_raise(signo2signm(sig));
break;
}
}
else {
rb_thread_trap_eval(trap_list[sig], sig);
}
}
static RETSIGTYPE sighandle _((int));
static RETSIGTYPE
sighandle(sig)
int sig;
{
#ifdef NT
#define IN_MAIN_CONTEXT(f, a) (win32_main_context(a, f) ? (void)0 : f(a))
#else
#define IN_MAIN_CONTEXT(f, a) f(a)
#endif
if (sig >= NSIG) {
rb_bug("trap_handler: Bad signal %d", sig);
}
#if !defined(BSD_SIGNAL)
ruby_signal(sig, sighandle);
#endif
if (ATOMIC_TEST(rb_trap_immediate)) {
IN_MAIN_CONTEXT(signal_exec, sig);
ATOMIC_SET(rb_trap_immediate, 1);
}
else {
ATOMIC_INC(rb_trap_pending);
ATOMIC_INC(trap_pending_list[sig]);
}
}
#ifdef SIGBUS
static RETSIGTYPE sigbus _((int));
static RETSIGTYPE
sigbus(sig)
int sig;
{
rb_bug("Bus Error");
}
#endif
#ifdef SIGSEGV
static RETSIGTYPE sigsegv _((int));
static RETSIGTYPE
sigsegv(sig)
int sig;
{
rb_bug("Segmentation fault");
}
#endif
void
rb_trap_exit()
{
#ifndef MACOS_UNUSE_SIGNAL
if (trap_list[0]) {
rb_eval_cmd(trap_list[0], rb_ary_new3(1, INT2FIX(0)));
}
#endif
}
void
rb_trap_exec()
{
#ifndef MACOS_UNUSE_SIGNAL
int i;
for (i=0; i<NSIG; i++) {
if (trap_pending_list[i]) {
trap_pending_list[i] = 0;
signal_exec(i);
}
}
#endif /* MACOS_UNUSE_SIGNAL */
rb_trap_pending = 0;
}
struct trap_arg {
#if !defined(NT)
# ifdef HAVE_SIGPROCMASK
sigset_t mask;
# else
int mask;
# endif
#endif
VALUE sig, cmd;
};
# ifdef HAVE_SIGPROCMASK
static sigset_t trap_last_mask;
# else
static int trap_last_mask;
# endif
static RETSIGTYPE sigexit _((int));
static RETSIGTYPE
sigexit(sig)
int sig;
{
rb_exit(0);
}
static VALUE
trap(arg)
struct trap_arg *arg;
{
RETSIGTYPE (*func)_((int));
VALUE command, old;
int sig;
char *s;
func = sighandle;
command = arg->cmd;
if (NIL_P(command)) {
func = SIG_IGN;
}
else if (TYPE(command) == T_STRING) {
Check_SafeStr(command); /* taint check */
if (RSTRING(command)->len == 0) {
func = SIG_IGN;
}
else if (RSTRING(command)->len == 7) {
if (strncmp(RSTRING(command)->ptr, "SIG_IGN", 7) == 0) {
func = SIG_IGN;
}
else if (strncmp(RSTRING(command)->ptr, "SIG_DFL", 7) == 0) {
func = SIG_DFL;
}
else if (strncmp(RSTRING(command)->ptr, "DEFAULT", 7) == 0) {
func = SIG_DFL;
}
}
else if (RSTRING(command)->len == 6) {
if (strncmp(RSTRING(command)->ptr, "IGNORE", 6) == 0) {
func = SIG_IGN;
}
}
else if (RSTRING(command)->len == 4) {
if (strncmp(RSTRING(command)->ptr, "EXIT", 4) == 0) {
func = sigexit;
}
}
}
if (func == SIG_IGN || func == SIG_DFL) {
command = 0;
}
switch (TYPE(arg->sig)) {
case T_FIXNUM:
sig = NUM2INT(arg->sig);
break;
case T_SYMBOL:
s = rb_id2name(SYM2ID(arg->sig));
if (!s) rb_raise(rb_eArgError, "bad signal");
goto str_signal;
case T_STRING:
s = RSTRING(arg->sig)->ptr;
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
sig = signm2signo(s);
if (sig == 0 && strcmp(s, "EXIT") != 0)
rb_raise(rb_eArgError, "invalid signal SIG%s", s);
}
if (sig < 0 || sig > NSIG) {
rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
}
#if defined(HAVE_SETITIMER) && !defined(__BOW__)
if (sig == SIGVTALRM) {
rb_raise(rb_eArgError, "SIGVTALRM reserved for Thread; cannot set handler");
}
#endif
if (func == SIG_DFL) {
switch (sig) {
case SIGINT:
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
func = sighandle;
break;
#ifdef SIGBUS
case SIGBUS:
func = sigbus;
break;
#endif
#ifdef SIGSEGV
case SIGSEGV:
func = sigsegv;
break;
#endif
#ifdef SIGPIPE
case SIGPIPE:
func = SIG_IGN;
break;
#endif
}
}
ruby_signal(sig, func);
old = trap_list[sig];
if (!old) old = Qnil;
trap_list[sig] = command;
/* enable at least specified signal. */
#if !defined(NT)
#ifdef HAVE_SIGPROCMASK
sigdelset(&arg->mask, sig);
#else
arg->mask &= ~sigmask(sig);
#endif
#endif
return old;
}
#if !defined(NT)
static VALUE
trap_ensure(arg)
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()
{
#if !defined(NT)
# ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_SETMASK, &trap_last_mask, NULL);
# else
sigsetmask(trap_last_mask);
# endif
#endif
}
static VALUE
rb_f_trap(argc, argv)
int argc;
VALUE *argv;
{
struct trap_arg arg;
rb_secure(2);
if (argc == 0 || argc > 2) {
rb_raise(rb_eArgError, "wrong # of arguments -- trap(sig, cmd)/trap(sig){...}");
}
arg.sig = argv[0];
if (argc == 1) {
arg.cmd = rb_f_lambda();
}
else if (argc == 2) {
arg.cmd = argv[1];
}
#if !defined(NT)
/* 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
}
void
Init_signal()
{
#ifndef MACOS_UNUSE_SIGNAL
rb_define_global_function("trap", rb_f_trap, -1);
ruby_signal(SIGINT, sighandle);
#ifdef SIGHUP
ruby_signal(SIGHUP, sighandle);
#endif
#ifdef SIGQUIT
ruby_signal(SIGQUIT, sighandle);
#endif
#ifdef SIGALRM
ruby_signal(SIGALRM, sighandle);
#endif
#ifdef SIGUSR1
ruby_signal(SIGUSR1, sighandle);
#endif
#ifdef SIGUSR2
ruby_signal(SIGUSR2, sighandle);
#endif
#ifdef SIGBUS
ruby_signal(SIGBUS, sigbus);
#endif
#ifdef SIGSEGV
ruby_signal(SIGSEGV, sigsegv);
#endif
#ifdef SIGPIPE
ruby_signal(SIGPIPE, SIG_IGN);
#endif
#endif /* MACOS_UNUSE_SIGNAL */
}
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