зеркало из https://github.com/github/ruby.git
740 строки
13 KiB
C
740 строки
13 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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char *signm;
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int signo;
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} siglist [] = {
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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(nm)
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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 char*
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signo2signm(no)
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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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VALUE
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rb_f_kill(argc, argv)
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int argc;
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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 VALUE trap_list[NSIG];
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static rb_atomic_t trap_pending_list[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;
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void
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rb_gc_mark_trap_list()
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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])
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rb_gc_mark(trap_list[i]);
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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(signum, handler)
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int signum;
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sighandler_t handler;
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{
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struct sigaction sigact, old;
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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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#if defined(SA_RESTART)
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/* All other signals but VTALRM shall restart restartable syscall
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VTALRM will cause EINTR to syscall if interrupted.
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*/
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if (signum != SIGVTALRM) {
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sigact.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
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}
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#endif
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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(signum, handler)
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int signum;
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sighandler_t handler;
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{
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ruby_signal(signum, handler);
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}
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#else
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#define ruby_signal(sig,handler) signal((sig),(handler))
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#endif
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static void signal_exec _((int sig));
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static void
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signal_exec(sig)
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int sig;
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{
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if (trap_list[sig] == 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 {
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rb_thread_trap_eval(trap_list[sig], sig);
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}
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}
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static RETSIGTYPE sighandler _((int));
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static RETSIGTYPE
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sighandler(sig)
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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(BSD_SIGNAL) && !defined(POSIX_SIGNAL)
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ruby_signal(sig, sighandler);
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#endif
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if (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 sigbus _((int));
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static RETSIGTYPE
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sigbus(sig)
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int sig;
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{
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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 sigsegv _((int));
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static RETSIGTYPE
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sigsegv(sig)
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int sig;
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{
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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 sigpipe _((int));
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static RETSIGTYPE
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sigpipe(sig)
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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()
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{
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#ifndef MACOS_UNUSE_SIGNAL
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if (trap_list[0]) {
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VALUE trap_exit = trap_list[0];
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trap_list[0] = 0;
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rb_eval_cmd(trap_exit, rb_ary_new3(1, INT2FIX(0)), 0);
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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()
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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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# 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 RETSIGTYPE sigexit _((int));
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static RETSIGTYPE
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sigexit(sig)
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int sig;
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{
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rb_exit(0);
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}
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static VALUE
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trap(arg)
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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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func = sighandler;
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command = arg->cmd;
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if (NIL_P(command)) {
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func = SIG_IGN;
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}
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else if (TYPE(command) == T_STRING) {
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SafeStringValue(command); /* taint check */
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if (RSTRING(command)->len == 0) {
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func = SIG_IGN;
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}
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else if (RSTRING(command)->len == 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) {
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func = SIG_DFL;
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}
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}
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else if (RSTRING(command)->len == 6) {
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if (strncmp(RSTRING(command)->ptr, "IGNORE", 6) == 0) {
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func = SIG_IGN;
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}
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}
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else if (RSTRING(command)->len == 4) {
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if (strncmp(RSTRING(command)->ptr, "EXIT", 4) == 0) {
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func = sigexit;
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}
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}
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}
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if (func == SIG_IGN || func == SIG_DFL) {
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command = 0;
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}
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switch (TYPE(arg->sig)) {
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case T_FIXNUM:
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sig = NUM2INT(arg->sig);
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break;
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case T_SYMBOL:
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s = rb_id2name(SYM2ID(arg->sig));
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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(arg->sig)->ptr;
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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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sig = signm2signo(s);
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if (sig == 0 && strcmp(s, "EXIT") != 0)
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rb_raise(rb_eArgError, "unsupported signal SIG%s", s);
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}
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if (sig < 0 || sig > NSIG) {
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rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
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}
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#if defined(HAVE_SETITIMER) && !defined(__BOW__)
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if (sig == SIGVTALRM) {
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rb_raise(rb_eArgError, "SIGVTALRM reserved for Thread; cannot set handler");
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}
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#endif
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if (func == SIG_DFL) {
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switch (sig) {
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case SIGINT:
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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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func = sighandler;
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break;
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#ifdef SIGBUS
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case SIGBUS:
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func = sigbus;
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break;
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#endif
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#ifdef SIGSEGV
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case SIGSEGV:
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func = sigsegv;
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break;
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#endif
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#ifdef SIGPIPE
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case SIGPIPE:
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func = sigpipe;
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break;
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#endif
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}
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}
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oldfunc = ruby_signal(sig, func);
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oldcmd = trap_list[sig];
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if (!oldcmd) {
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if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
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else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
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else oldcmd = Qnil;
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}
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|
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trap_list[sig] = command;
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|
/* 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(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()
|
|
{
|
|
#ifndef _WIN32
|
|
# ifdef HAVE_SIGPROCMASK
|
|
sigprocmask(SIG_SETMASK, &trap_last_mask, NULL);
|
|
# else
|
|
sigsetmask(trap_last_mask);
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
static VALUE
|
|
sig_trap(argc, argv)
|
|
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_f_lambda();
|
|
}
|
|
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
|
|
}
|
|
|
|
static VALUE
|
|
sig_list()
|
|
{
|
|
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(signum, handler)
|
|
int signum;
|
|
sighandler_t handler;
|
|
{
|
|
sighandler_t old;
|
|
|
|
old = ruby_signal(signum, handler);
|
|
if (old != SIG_DFL) {
|
|
ruby_signal(signum, old);
|
|
}
|
|
}
|
|
|
|
void
|
|
Init_signal()
|
|
{
|
|
#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
|
|
install_sighandler(SIGBUS, sigbus);
|
|
#endif
|
|
#ifdef SIGSEGV
|
|
install_sighandler(SIGSEGV, sigsegv);
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
install_sighandler(SIGPIPE, sigpipe);
|
|
#endif
|
|
#endif /* MACOS_UNUSE_SIGNAL */
|
|
}
|