зеркало из https://github.com/github/ruby.git
969 строки
19 KiB
C
969 строки
19 KiB
C
/**********************************************************************
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signal.c -
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$Author$
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$Date$
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created at: Tue Dec 20 10:13:44 JST 1994
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Copyright (C) 1993-2003 Yukihiro Matsumoto
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Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
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Copyright (C) 2000 Information-technology Promotion Agency, Japan
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**********************************************************************/
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#include "ruby.h"
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#include "rubysig.h"
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#include <signal.h>
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#include <stdio.h>
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#ifdef __BEOS__
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#undef SIGBUS
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#endif
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#ifndef NSIG
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# ifdef DJGPP
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# define NSIG SIGMAX
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# else
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# define NSIG (_SIGMAX + 1) /* For QNX */
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# endif
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#endif
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static struct signals {
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const char *signm;
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int signo;
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} siglist [] = {
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{"EXIT", 0},
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#ifdef SIGHUP
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{"HUP", SIGHUP},
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#endif
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{"INT", SIGINT},
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#ifdef SIGQUIT
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{"QUIT", SIGQUIT},
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#endif
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#ifdef SIGILL
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{"ILL", SIGILL},
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#endif
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#ifdef SIGTRAP
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{"TRAP", SIGTRAP},
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#endif
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#ifdef SIGIOT
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{"IOT", SIGIOT},
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#endif
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#ifdef SIGABRT
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{"ABRT", SIGABRT},
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#endif
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#ifdef SIGEMT
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{"EMT", SIGEMT},
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#endif
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#ifdef SIGFPE
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{"FPE", SIGFPE},
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#endif
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#ifdef SIGKILL
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{"KILL", SIGKILL},
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#endif
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#ifdef SIGBUS
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{"BUS", SIGBUS},
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#endif
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#ifdef SIGSEGV
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{"SEGV", SIGSEGV},
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#endif
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#ifdef SIGSYS
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{"SYS", SIGSYS},
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#endif
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#ifdef SIGPIPE
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{"PIPE", SIGPIPE},
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#endif
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#ifdef SIGALRM
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{"ALRM", SIGALRM},
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#endif
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#ifdef SIGTERM
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{"TERM", SIGTERM},
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#endif
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#ifdef SIGURG
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{"URG", SIGURG},
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#endif
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#ifdef SIGSTOP
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{"STOP", SIGSTOP},
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#endif
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#ifdef SIGTSTP
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{"TSTP", SIGTSTP},
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#endif
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#ifdef SIGCONT
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{"CONT", SIGCONT},
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#endif
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#ifdef SIGCHLD
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{"CHLD", SIGCHLD},
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#endif
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#ifdef SIGCLD
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{"CLD", SIGCLD},
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#else
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# ifdef SIGCHLD
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{"CLD", SIGCHLD},
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# endif
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#endif
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#ifdef SIGTTIN
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{"TTIN", SIGTTIN},
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#endif
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#ifdef SIGTTOU
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{"TTOU", SIGTTOU},
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#endif
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#ifdef SIGIO
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{"IO", SIGIO},
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#endif
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#ifdef SIGXCPU
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{"XCPU", SIGXCPU},
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#endif
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#ifdef SIGXFSZ
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{"XFSZ", SIGXFSZ},
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#endif
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#ifdef SIGVTALRM
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{"VTALRM", SIGVTALRM},
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#endif
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#ifdef SIGPROF
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{"PROF", SIGPROF},
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#endif
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#ifdef SIGWINCH
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{"WINCH", SIGWINCH},
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#endif
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#ifdef SIGUSR1
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{"USR1", SIGUSR1},
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#endif
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#ifdef SIGUSR2
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{"USR2", SIGUSR2},
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#endif
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#ifdef SIGLOST
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{"LOST", SIGLOST},
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#endif
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#ifdef SIGMSG
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{"MSG", SIGMSG},
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#endif
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#ifdef SIGPWR
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{"PWR", SIGPWR},
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#endif
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#ifdef SIGPOLL
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{"POLL", SIGPOLL},
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#endif
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#ifdef SIGDANGER
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{"DANGER", SIGDANGER},
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#endif
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#ifdef SIGMIGRATE
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{"MIGRATE", SIGMIGRATE},
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#endif
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#ifdef SIGPRE
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{"PRE", SIGPRE},
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#endif
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#ifdef SIGGRANT
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{"GRANT", SIGGRANT},
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#endif
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#ifdef SIGRETRACT
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{"RETRACT", SIGRETRACT},
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#endif
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#ifdef SIGSOUND
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{"SOUND", SIGSOUND},
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#endif
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#ifdef SIGINFO
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{"INFO", SIGINFO},
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#endif
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{NULL, 0}
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};
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static int
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signm2signo(const char *nm)
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{
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struct signals *sigs;
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for (sigs = siglist; sigs->signm; sigs++)
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if (strcmp(sigs->signm, nm) == 0)
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return sigs->signo;
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return 0;
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}
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static const char*
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signo2signm(int no)
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{
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struct signals *sigs;
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for (sigs = siglist; sigs->signm; sigs++)
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if (sigs->signo == no)
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return sigs->signm;
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return 0;
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}
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const char *
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ruby_signal_name(int no)
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{
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return signo2signm(no);
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}
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/*
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* call-seq:
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* Process.kill(signal, pid, ...) => fixnum
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*
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* Sends the given signal to the specified process id(s), or to the
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* current process if _pid_ is zero. _signal_ may be an
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* integer signal number or a POSIX signal name (either with or without
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* a +SIG+ prefix). If _signal_ is negative (or starts
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* with a minus sign), kills process groups instead of
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* processes. Not all signals are available on all platforms.
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*
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* pid = fork do
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* Signal.trap("HUP") { puts "Ouch!"; exit }
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* # ... do some work ...
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* end
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* # ...
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* Process.kill("HUP", pid)
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* Process.wait
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*
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* <em>produces:</em>
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*
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* Ouch!
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*/
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VALUE
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rb_f_kill(int argc, VALUE *argv)
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{
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int negative = 0;
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int sig;
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int i;
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char *s;
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rb_secure(2);
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if (argc < 2)
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rb_raise(rb_eArgError, "wrong number of arguments -- kill(sig, pid...)");
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switch (TYPE(argv[0])) {
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case T_FIXNUM:
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sig = FIX2INT(argv[0]);
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break;
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case T_SYMBOL:
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s = rb_id2name(SYM2ID(argv[0]));
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if (!s) rb_raise(rb_eArgError, "bad signal");
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goto str_signal;
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case T_STRING:
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s = RSTRING(argv[0])->ptr;
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if (s[0] == '-') {
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negative++;
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s++;
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}
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str_signal:
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if (strncmp("SIG", s, 3) == 0)
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s += 3;
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if((sig = signm2signo(s)) == 0)
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rb_raise(rb_eArgError, "unsupported name `SIG%s'", s);
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if (negative)
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sig = -sig;
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break;
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default:
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{
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VALUE str;
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str = rb_check_string_type(argv[0]);
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if (!NIL_P(str)) {
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s = RSTRING(str)->ptr;
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goto str_signal;
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}
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rb_raise(rb_eArgError, "bad signal type %s",
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rb_obj_classname(argv[0]));
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}
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break;
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}
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if (sig < 0) {
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sig = -sig;
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for (i=1; i<argc; i++) {
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int pid = NUM2INT(argv[i]);
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#ifdef HAS_KILLPG
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if (killpg(pid, sig) < 0)
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#else
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if (kill(-pid, sig) < 0)
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#endif
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rb_sys_fail(0);
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}
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}
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else {
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for (i=1; i<argc; i++) {
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Check_Type(argv[i], T_FIXNUM);
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if (kill(FIX2INT(argv[i]), sig) < 0)
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rb_sys_fail(0);
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}
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}
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return INT2FIX(i-1);
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}
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static struct {
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VALUE cmd;
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int safe;
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} trap_list[NSIG];
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static rb_atomic_t trap_pending_list[NSIG];
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static char rb_trap_accept_nativethreads[NSIG];
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rb_atomic_t rb_trap_pending;
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rb_atomic_t rb_trap_immediate;
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int rb_prohibit_interrupt = 1;
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void
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rb_gc_mark_trap_list(void)
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{
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#ifndef MACOS_UNUSE_SIGNAL
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int i;
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for (i=0; i<NSIG; i++) {
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if (trap_list[i].cmd)
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rb_gc_mark(trap_list[i].cmd);
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}
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#endif /* MACOS_UNUSE_SIGNAL */
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}
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#ifdef __dietlibc__
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#define sighandler_t sh_t
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#endif
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typedef RETSIGTYPE (*sighandler_t)(int);
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#ifdef POSIX_SIGNAL
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static sighandler_t
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ruby_signal(int signum, sighandler_t handler)
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{
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struct sigaction sigact, old;
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rb_trap_accept_nativethreads[signum] = 0;
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sigact.sa_handler = handler;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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#ifdef SA_NOCLDWAIT
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if (signum == SIGCHLD && handler == SIG_IGN)
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sigact.sa_flags |= SA_NOCLDWAIT;
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#endif
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sigaction(signum, &sigact, &old);
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return old.sa_handler;
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}
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void
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posix_signal(int signum, sighandler_t handler)
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{
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ruby_signal(signum, handler);
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}
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#ifdef HAVE_NATIVETHREAD
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static sighandler_t
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ruby_nativethread_signal(int signum, sighandler_t handler)
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{
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sighandler_t old;
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old = ruby_signal(signum, handler);
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rb_trap_accept_nativethreads[signum] = 1;
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return old;
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}
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void
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posix_nativethread_signal(int signum, sighandler_t handler)
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{
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ruby_nativethread_signal(signum, handler);
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}
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#endif
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#else /* !POSIX_SIGNAL */
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#define ruby_signal(sig,handler) (rb_trap_accept_nativethreads[sig] = 0, signal((sig),(handler)))
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#ifdef HAVE_NATIVETHREAD
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static sighandler_t
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ruby_nativethread_signal(int signum, sighandler_t handler)
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{
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sighandler_t old;
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old = signal(signum, handler);
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rb_trap_accept_nativethreads[signum] = 1;
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return old;
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}
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#endif
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#endif
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static void
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signal_exec(int sig)
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{
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if (trap_list[sig].cmd == 0) {
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switch (sig) {
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case SIGINT:
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rb_thread_interrupt();
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break;
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#ifdef SIGHUP
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case SIGHUP:
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#endif
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#ifdef SIGQUIT
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case SIGQUIT:
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#endif
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#ifdef SIGALRM
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case SIGALRM:
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#endif
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#ifdef SIGUSR1
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case SIGUSR1:
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#endif
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#ifdef SIGUSR2
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case SIGUSR2:
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#endif
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rb_thread_signal_raise(signo2signm(sig));
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break;
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}
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}
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else if (trap_list[sig].cmd == Qundef) {
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rb_thread_signal_exit();
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}
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else {
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rb_thread_trap_eval(trap_list[sig].cmd, sig, trap_list[sig].safe);
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}
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}
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#if defined(HAVE_NATIVETHREAD) && defined(HAVE_NATIVETHREAD_KILL)
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static void
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sigsend_to_ruby_thread(int sig)
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{
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#ifdef HAVE_SIGPROCMASK
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sigset_t mask, old_mask;
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#else
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int mask, old_mask;
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#endif
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#ifdef HAVE_SIGPROCMASK
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sigfillset(&mask);
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sigprocmask(SIG_BLOCK, &mask, &old_mask);
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#else
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mask = sigblock(~0);
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sigsetmask(mask);
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#endif
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ruby_native_thread_kill(sig);
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}
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#endif
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static RETSIGTYPE
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sighandler(int sig)
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{
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#ifdef _WIN32
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#define IN_MAIN_CONTEXT(f, a) (rb_w32_main_context(a, f) ? (void)0 : f(a))
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#else
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#define IN_MAIN_CONTEXT(f, a) f(a)
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#endif
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if (sig >= NSIG) {
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rb_bug("trap_handler: Bad signal %d", sig);
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}
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#if defined(HAVE_NATIVETHREAD) && defined(HAVE_NATIVETHREAD_KILL)
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if (!is_ruby_native_thread() && !rb_trap_accept_nativethreads[sig]) {
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sigsend_to_ruby_thread(sig);
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return;
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}
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#endif
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#if !defined(BSD_SIGNAL) && !defined(POSIX_SIGNAL)
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if (rb_trap_accept_nativethreads[sig]) {
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ruby_nativethread_signal(sig, sighandler);
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} else {
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ruby_signal(sig, sighandler);
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}
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#endif
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if (trap_list[sig].cmd == 0 && ATOMIC_TEST(rb_trap_immediate)) {
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IN_MAIN_CONTEXT(signal_exec, sig);
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ATOMIC_SET(rb_trap_immediate, 1);
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}
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else {
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ATOMIC_INC(rb_trap_pending);
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ATOMIC_INC(trap_pending_list[sig]);
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}
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}
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#ifdef SIGBUS
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static RETSIGTYPE
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sigbus(int sig)
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{
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#if defined(HAVE_NATIVETHREAD) && defined(HAVE_NATIVETHREAD_KILL)
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if (!is_ruby_native_thread() && !rb_trap_accept_nativethreads[sig]) {
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sigsend_to_ruby_thread(sig);
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return;
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}
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#endif
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rb_bug("Bus Error");
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}
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#endif
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#ifdef SIGSEGV
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static RETSIGTYPE
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sigsegv(int sig)
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{
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#if defined(HAVE_NATIVETHREAD) && defined(HAVE_NATIVETHREAD_KILL)
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if (!is_ruby_native_thread() && !rb_trap_accept_nativethreads[sig]) {
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sigsend_to_ruby_thread(sig);
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return;
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}
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#endif
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rb_bug("Segmentation fault");
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}
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#endif
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#ifdef SIGPIPE
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static RETSIGTYPE
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sigpipe(int sig)
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{
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/* do nothing */
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}
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#endif
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void
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rb_trap_exit(void)
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{
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#ifndef MACOS_UNUSE_SIGNAL
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if (trap_list[0].cmd) {
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VALUE trap_exit = trap_list[0].cmd;
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trap_list[0].cmd = 0;
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rb_eval_cmd(trap_exit, rb_ary_new3(1, INT2FIX(0)), trap_list[0].safe);
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}
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#endif
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}
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void
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rb_trap_exec(void)
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{
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#ifndef MACOS_UNUSE_SIGNAL
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int i;
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for (i=0; i<NSIG; i++) {
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if (trap_pending_list[i]) {
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trap_pending_list[i] = 0;
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signal_exec(i);
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}
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}
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#endif /* MACOS_UNUSE_SIGNAL */
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rb_trap_pending = 0;
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}
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struct trap_arg {
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#ifndef _WIN32
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# ifdef HAVE_SIGPROCMASK
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sigset_t mask;
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# else
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int mask;
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# endif
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#endif
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VALUE sig, cmd;
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};
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|
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# ifdef HAVE_SIGPROCMASK
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static sigset_t trap_last_mask;
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# else
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static int trap_last_mask;
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# endif
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static VALUE
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trap(struct trap_arg *arg)
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{
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sighandler_t func, oldfunc;
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VALUE command, oldcmd;
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int sig = -1;
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char *s;
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|
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func = sighandler;
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if (NIL_P(arg->cmd)) {
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func = SIG_IGN;
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}
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else {
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command = rb_check_string_type(arg->cmd);
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if (!NIL_P(command)) {
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SafeStringValue(command); /* taint check */
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switch (RSTRING(command)->len) {
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case 0:
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func = SIG_IGN;
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break;
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case 7:
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if (strncmp(RSTRING(command)->ptr, "SIG_IGN", 7) == 0) {
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func = SIG_IGN;
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}
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else if (strncmp(RSTRING(command)->ptr, "SIG_DFL", 7) == 0) {
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func = SIG_DFL;
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}
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else if (strncmp(RSTRING(command)->ptr, "DEFAULT", 7) == 0) {
|
|
func = SIG_DFL;
|
|
}
|
|
break;
|
|
case 6:
|
|
if (strncmp(RSTRING(command)->ptr, "IGNORE", 6) == 0) {
|
|
func = SIG_IGN;
|
|
}
|
|
break;
|
|
case 4:
|
|
if (strncmp(RSTRING(command)->ptr, "EXIT", 4) == 0) {
|
|
arg->cmd = Qundef;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (func == SIG_IGN || func == SIG_DFL) {
|
|
command = 0;
|
|
}
|
|
else {
|
|
command = arg->cmd;
|
|
}
|
|
|
|
switch (TYPE(arg->sig)) {
|
|
case T_FIXNUM:
|
|
sig = FIX2INT(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, "unsupported signal SIG%s", s);
|
|
}
|
|
|
|
if (sig < 0 || sig > NSIG) {
|
|
rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
|
|
}
|
|
#if defined(HAVE_SETITIMER)
|
|
if (sig == SIGVTALRM) {
|
|
rb_raise(rb_eArgError, "SIGVTALRM reserved for Thread; can't 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 = 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
|
|
}
|
|
}
|
|
oldfunc = ruby_signal(sig, func);
|
|
oldcmd = trap_list[sig].cmd;
|
|
if (!oldcmd) {
|
|
if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
|
|
else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
|
|
else oldcmd = Qnil;
|
|
}
|
|
|
|
trap_list[sig].cmd = command;
|
|
trap_list[sig].safe = ruby_safe_level;
|
|
/* enable at least specified signal. */
|
|
#ifndef _WIN32
|
|
#ifdef HAVE_SIGPROCMASK
|
|
sigdelset(&arg->mask, sig);
|
|
#else
|
|
arg->mask &= ~sigmask(sig);
|
|
#endif
|
|
#endif
|
|
return oldcmd;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
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)
|
|
{
|
|
#ifndef _WIN32
|
|
# ifdef HAVE_SIGPROCMASK
|
|
sigprocmask(SIG_SETMASK, &trap_last_mask, NULL);
|
|
# else
|
|
sigsetmask(trap_last_mask);
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* Signal.trap( signal, proc ) => 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 operating system's default handler
|
|
* will be invoked. If the command is ``EXIT'', the script will be
|
|
* terminated by the signal. 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 = argv[0];
|
|
if (argc == 1) {
|
|
arg.cmd = rb_block_proc();
|
|
}
|
|
else if (argc == 2) {
|
|
arg.cmd = argv[1];
|
|
}
|
|
|
|
if (OBJ_TAINTED(arg.cmd)) {
|
|
rb_raise(rb_eSecurityError, "Insecure: tainted signal trap");
|
|
}
|
|
#ifndef _WIN32
|
|
/* 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();
|
|
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);
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_NATIVETHREAD
|
|
static void
|
|
install_nativethread_sighandler(int signum, sighandler_t handler)
|
|
{
|
|
sighandler_t old;
|
|
int old_st;
|
|
|
|
old_st = rb_trap_accept_nativethreads[signum];
|
|
old = ruby_nativethread_signal(signum, handler);
|
|
if (old != SIG_DFL) {
|
|
if (old_st) {
|
|
ruby_nativethread_signal(signum, old);
|
|
} else {
|
|
ruby_signal(signum, old);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
init_sigchld(int sig)
|
|
{
|
|
sighandler_t oldfunc;
|
|
#ifndef _WIN32
|
|
# ifdef HAVE_SIGPROCMASK
|
|
sigset_t mask;
|
|
# else
|
|
int mask;
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef _WIN32
|
|
/* 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;
|
|
}
|
|
|
|
#ifndef _WIN32
|
|
#ifdef HAVE_SIGPROCMASK
|
|
sigdelset(&mask, sig);
|
|
sigprocmask(SIG_SETMASK, &mask, NULL);
|
|
#else
|
|
mask &= ~sigmask(sig);
|
|
sigsetmask(mask);
|
|
#endif
|
|
trap_last_mask = mask;
|
|
#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);
|
|
|
|
install_sighandler(SIGINT, sighandler);
|
|
#ifdef SIGHUP
|
|
install_sighandler(SIGHUP, sighandler);
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
install_sighandler(SIGQUIT, sighandler);
|
|
#endif
|
|
#ifdef SIGALRM
|
|
install_sighandler(SIGALRM, sighandler);
|
|
#endif
|
|
#ifdef SIGUSR1
|
|
install_sighandler(SIGUSR1, sighandler);
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
install_sighandler(SIGUSR2, sighandler);
|
|
#endif
|
|
|
|
#ifdef SIGBUS
|
|
# ifndef RUBY_GC_STRESS
|
|
install_sighandler(SIGBUS, sigbus);
|
|
# endif
|
|
#endif
|
|
#ifdef SIGSEGV
|
|
# ifndef RUBY_GC_STRESS
|
|
install_sighandler(SIGSEGV, sigsegv);
|
|
# endif
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
install_sighandler(SIGPIPE, sigpipe);
|
|
#endif
|
|
|
|
#ifdef SIGCLD
|
|
init_sigchld(SIGCLD);
|
|
#endif
|
|
#ifdef SIGCHLD
|
|
init_sigchld(SIGCHLD);
|
|
#endif
|
|
|
|
#endif /* MACOS_UNUSE_SIGNAL */
|
|
}
|