зеркало из https://github.com/github/ruby.git
1359 строки
29 KiB
C
1359 строки
29 KiB
C
/**********************************************************************
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signal.c -
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$Author$
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created at: Tue Dec 20 10:13:44 JST 1994
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Copyright (C) 1993-2007 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/ruby.h"
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#include "vm_core.h"
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#include <signal.h>
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#include <stdio.h>
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#include <errno.h>
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#include "ruby_atomic.h"
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#include "eval_intern.h"
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#include "internal.h"
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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# include <valgrind/memcheck.h>
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# ifndef VALGRIND_MAKE_MEM_DEFINED
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# define VALGRIND_MAKE_MEM_DEFINED(p, n) VALGRIND_MAKE_READABLE((p), (n))
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# endif
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# ifndef VALGRIND_MAKE_MEM_UNDEFINED
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# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) VALGRIND_MAKE_WRITABLE((p), (n))
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# endif
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#else
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# define VALGRIND_MAKE_MEM_DEFINED(p, n) 0
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# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) 0
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#endif
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#if defined(__native_client__) && defined(NACL_NEWLIB)
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# include "nacl/signal.h"
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#endif
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#ifdef NEED_RUBY_ATOMIC_OPS
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rb_atomic_t
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ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val)
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{
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rb_atomic_t old = *ptr;
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*ptr = val;
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return old;
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}
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rb_atomic_t
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ruby_atomic_compare_and_swap(rb_atomic_t *ptr, rb_atomic_t cmp,
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rb_atomic_t newval)
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{
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rb_atomic_t old = *ptr;
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if (old == cmp) {
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*ptr = newval;
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}
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return old;
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}
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#endif
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#if defined(__BEOS__) || defined(__HAIKU__)
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#undef SIGBUS
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#endif
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#ifndef NSIG
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# define NSIG (_SIGMAX + 1) /* For QNX */
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#endif
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static const 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 SIGABRT
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{"ABRT", SIGABRT},
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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 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 const char signame_prefix[3] = "SIG";
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static int
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signm2signo(const char *nm)
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{
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const 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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const 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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/*
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* call-seq:
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* Signal.signame(signo) -> string
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*
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* convert signal number to signal name
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*
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* Signal.trap("INT") { |signo| puts Signal.signame(signo) }
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* Process.kill("INT", 0)
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*
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* <em>produces:</em>
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*
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* INT
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*/
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static VALUE
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sig_signame(VALUE recv, VALUE signo)
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{
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const char *signame = signo2signm(NUM2INT(signo));
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return rb_str_new_cstr(signame);
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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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* SignalException.new(sig_name) -> signal_exception
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* SignalException.new(sig_number [, name]) -> signal_exception
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*
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* Construct a new SignalException object. +sig_name+ should be a known
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* signal name.
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*/
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static VALUE
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esignal_init(int argc, VALUE *argv, VALUE self)
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{
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int argnum = 1;
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VALUE sig = Qnil;
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int signo;
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const char *signm;
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if (argc > 0) {
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sig = rb_check_to_integer(argv[0], "to_int");
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if (!NIL_P(sig)) argnum = 2;
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else sig = argv[0];
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}
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rb_check_arity(argc, 1, argnum);
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if (argnum == 2) {
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signo = NUM2INT(sig);
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if (signo < 0 || signo > NSIG) {
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rb_raise(rb_eArgError, "invalid signal number (%d)", signo);
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}
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if (argc > 1) {
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sig = argv[1];
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}
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else {
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signm = signo2signm(signo);
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if (signm) {
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sig = rb_sprintf("SIG%s", signm);
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}
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else {
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sig = rb_sprintf("SIG%u", signo);
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}
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}
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}
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else {
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int len = sizeof(signame_prefix);
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signm = SYMBOL_P(sig) ? rb_id2name(SYM2ID(sig)) : StringValuePtr(sig);
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if (strncmp(signm, signame_prefix, len) == 0) {
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signm += len;
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len = 0;
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}
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signo = signm2signo(signm);
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if (!signo) {
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rb_raise(rb_eArgError, "unsupported name `%.*s%"PRIsVALUE"'",
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len, signame_prefix, sig);
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}
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sig = rb_sprintf("SIG%s", signm);
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}
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rb_call_super(1, &sig);
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rb_iv_set(self, "signo", INT2NUM(signo));
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return self;
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}
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/*
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* call-seq:
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* signal_exception.signo -> num
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*
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* Returns a signal number.
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*/
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static VALUE
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esignal_signo(VALUE self)
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{
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return rb_iv_get(self, "signo");
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}
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/* :nodoc: */
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static VALUE
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interrupt_init(int argc, VALUE *argv, VALUE self)
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{
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VALUE args[2];
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args[0] = INT2FIX(SIGINT);
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rb_scan_args(argc, argv, "01", &args[1]);
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return rb_call_super(2, args);
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}
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void
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ruby_default_signal(int sig)
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{
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signal(sig, SIG_DFL);
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raise(sig);
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}
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static int signal_ignored(int sig);
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static void signal_enque(int sig);
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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) if _pid_ is positive.
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* If _pid_ is zero _signal_ is sent to all processes whose group ID is equal
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* to the group ID of the process. _signal_ may be an integer signal number or
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* a POSIX signal name (either with or without a +SIG+ prefix). If _signal_ is
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* negative (or starts 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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* If _signal_ is an integer but wrong for signal,
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* <code>Errno::EINVAL</code> or +RangeError+ will be raised.
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* Otherwise unless _signal_ is a +String+ or a +Symbol+, and a known
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* signal name, +ArgumentError+ will be raised.
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*
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* Also, <code>Errno::ESRCH</code> or +RangeError+ for invalid _pid_,
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* <code>Errno::EPERM</code> when failed because of no privilege,
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* will be raised. In these cases, signals may have been sent to
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* preceding processes.
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*/
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VALUE
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rb_f_kill(int argc, const VALUE *argv)
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{
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#ifndef HAVE_KILLPG
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#define killpg(pg, sig) kill(-(pg), (sig))
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#endif
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int negative = 0;
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int sig;
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int i;
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volatile VALUE str;
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const char *s;
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rb_secure(2);
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rb_check_arity(argc, 2, UNLIMITED_ARGUMENTS);
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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_PTR(argv[0]);
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str_signal:
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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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if (strncmp(signame_prefix, s, sizeof(signame_prefix)) == 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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str = rb_check_string_type(argv[0]);
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if (!NIL_P(str)) {
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s = RSTRING_PTR(str);
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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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break;
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}
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if (argc <= 1) return INT2FIX(0);
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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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if (killpg(NUM2PIDT(argv[i]), sig) < 0)
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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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const rb_pid_t self = (GET_THREAD() == GET_VM()->main_thread) ? getpid() : -1;
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int wakeup = 0;
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for (i=1; i<argc; i++) {
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rb_pid_t pid = NUM2PIDT(argv[i]);
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if ((sig != 0) && (self != -1) && (pid == self)) {
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/*
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* When target pid is self, many caller assume signal will be
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* delivered immediately and synchronously.
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*/
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switch (sig) {
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case SIGSEGV:
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#ifdef SIGBUS
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case SIGBUS:
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#endif
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#ifdef SIGKILL
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case SIGKILL:
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#endif
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#ifdef SIGSTOP
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case SIGSTOP:
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#endif
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ruby_kill(pid, sig);
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break;
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default:
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if (signal_ignored(sig)) break;
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signal_enque(sig);
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wakeup = 1;
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}
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}
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else if (kill(pid, sig) < 0) {
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rb_sys_fail(0);
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}
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}
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if (wakeup) {
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rb_threadptr_check_signal(GET_VM()->main_thread);
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}
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}
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rb_thread_execute_interrupts(rb_thread_current());
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return INT2FIX(i-1);
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}
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static struct {
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rb_atomic_t cnt[RUBY_NSIG];
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rb_atomic_t size;
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} signal_buff;
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#ifdef __dietlibc__
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#define sighandler_t sh_t
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#else
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#define sighandler_t ruby_sighandler_t
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#endif
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typedef RETSIGTYPE (*sighandler_t)(int);
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#ifdef USE_SIGALTSTACK
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typedef void ruby_sigaction_t(int, siginfo_t*, void*);
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#define SIGINFO_ARG , siginfo_t *info, void *ctx
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#define SIGINFO_CTX ctx
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#else
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typedef RETSIGTYPE ruby_sigaction_t(int);
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#define SIGINFO_ARG
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#define SIGINFO_CTX 0
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#endif
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|
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#ifdef USE_SIGALTSTACK
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int
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rb_sigaltstack_size(void)
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{
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/* XXX: BSD_vfprintf() uses >1500KiB stack and x86-64 need >5KiB stack. */
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int size = 8192;
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#ifdef MINSIGSTKSZ
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if (size < MINSIGSTKSZ)
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size = MINSIGSTKSZ;
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#endif
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#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
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{
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int pagesize;
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pagesize = (int)sysconf(_SC_PAGE_SIZE);
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if (size < pagesize)
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size = pagesize;
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}
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#endif
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return size;
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}
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|
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/* alternate stack for SIGSEGV */
|
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void
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rb_register_sigaltstack(rb_thread_t *th)
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{
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stack_t newSS, oldSS;
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if (!th->altstack)
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rb_bug("rb_register_sigaltstack: th->altstack not initialized\n");
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newSS.ss_sp = th->altstack;
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newSS.ss_size = rb_sigaltstack_size();
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newSS.ss_flags = 0;
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sigaltstack(&newSS, &oldSS); /* ignore error. */
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}
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#endif /* USE_SIGALTSTACK */
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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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#if 0
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rb_trap_accept_nativethreads[signum] = 0;
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#endif
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|
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sigemptyset(&sigact.sa_mask);
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#ifdef USE_SIGALTSTACK
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sigact.sa_sigaction = (ruby_sigaction_t*)handler;
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sigact.sa_flags = SA_SIGINFO;
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#else
|
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sigact.sa_handler = handler;
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sigact.sa_flags = 0;
|
|
#endif
|
|
|
|
switch (signum) {
|
|
#ifdef SA_NOCLDWAIT
|
|
case SIGCHLD:
|
|
if (handler == SIG_IGN)
|
|
sigact.sa_flags |= SA_NOCLDWAIT;
|
|
break;
|
|
#endif
|
|
#if defined(SA_ONSTACK) && defined(USE_SIGALTSTACK)
|
|
case SIGSEGV:
|
|
#ifdef SIGBUS
|
|
case SIGBUS:
|
|
#endif
|
|
sigact.sa_flags |= SA_ONSTACK;
|
|
break;
|
|
#endif
|
|
}
|
|
(void)VALGRIND_MAKE_MEM_DEFINED(&old, sizeof(old));
|
|
if (sigaction(signum, &sigact, &old) < 0) {
|
|
if (errno != 0 && errno != EINVAL) {
|
|
rb_bug_errno("sigaction", errno);
|
|
}
|
|
}
|
|
if (old.sa_flags & SA_SIGINFO)
|
|
return (sighandler_t)old.sa_sigaction;
|
|
else
|
|
return old.sa_handler;
|
|
}
|
|
|
|
sighandler_t
|
|
posix_signal(int signum, sighandler_t handler)
|
|
{
|
|
return ruby_signal(signum, handler);
|
|
}
|
|
|
|
#else /* !POSIX_SIGNAL */
|
|
#define ruby_signal(sig,handler) (/* rb_trap_accept_nativethreads[(sig)] = 0,*/ signal((sig),(handler)))
|
|
#if 0 /* def HAVE_NATIVETHREAD */
|
|
static sighandler_t
|
|
ruby_nativethread_signal(int signum, sighandler_t handler)
|
|
{
|
|
sighandler_t old;
|
|
|
|
old = signal(signum, handler);
|
|
rb_trap_accept_nativethreads[signum] = 1;
|
|
return old;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
static int
|
|
signal_ignored(int sig)
|
|
{
|
|
#ifdef POSIX_SIGNAL
|
|
struct sigaction old;
|
|
(void)VALGRIND_MAKE_MEM_DEFINED(&old, sizeof(old));
|
|
if (sigaction(sig, NULL, &old) < 0) return FALSE;
|
|
return old.sa_handler == SIG_IGN;
|
|
#else
|
|
sighandler_t old = signal(sig, SIG_DFL);
|
|
signal(sig, old);
|
|
return old == SIG_IGN;
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
signal_enque(int sig)
|
|
{
|
|
ATOMIC_INC(signal_buff.cnt[sig]);
|
|
ATOMIC_INC(signal_buff.size);
|
|
}
|
|
|
|
static RETSIGTYPE
|
|
sighandler(int sig)
|
|
{
|
|
signal_enque(sig);
|
|
rb_thread_wakeup_timer_thread();
|
|
#if !defined(BSD_SIGNAL) && !defined(POSIX_SIGNAL)
|
|
ruby_signal(sig, sighandler);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
rb_signal_buff_size(void)
|
|
{
|
|
return signal_buff.size;
|
|
}
|
|
|
|
#if HAVE_PTHREAD_H
|
|
#include <pthread.h>
|
|
#endif
|
|
|
|
static void
|
|
rb_disable_interrupt(void)
|
|
{
|
|
#ifdef HAVE_PTHREAD_SIGMASK
|
|
sigset_t mask;
|
|
sigfillset(&mask);
|
|
pthread_sigmask(SIG_SETMASK, &mask, NULL);
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
rb_enable_interrupt(void)
|
|
{
|
|
#ifdef HAVE_PTHREAD_SIGMASK
|
|
sigset_t mask;
|
|
sigemptyset(&mask);
|
|
pthread_sigmask(SIG_SETMASK, &mask, NULL);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
rb_get_next_signal(void)
|
|
{
|
|
int i, sig = 0;
|
|
|
|
if (signal_buff.size != 0) {
|
|
for (i=1; i<RUBY_NSIG; i++) {
|
|
if (signal_buff.cnt[i] > 0) {
|
|
ATOMIC_DEC(signal_buff.cnt[i]);
|
|
ATOMIC_DEC(signal_buff.size);
|
|
sig = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return sig;
|
|
}
|
|
|
|
|
|
#if defined(USE_SIGALTSTACK) || defined(_WIN32)
|
|
NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
|
|
#if !(defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__))
|
|
#elif defined __linux__
|
|
# define USE_UCONTEXT_REG 1
|
|
#elif defined __APPLE__
|
|
# define USE_UCONTEXT_REG 1
|
|
#endif
|
|
#ifdef USE_UCONTEXT_REG
|
|
static void
|
|
check_stack_overflow(const uintptr_t addr, const ucontext_t *ctx)
|
|
{
|
|
# if defined __linux__
|
|
const mcontext_t *mctx = &ctx->uc_mcontext;
|
|
# if defined REG_RSP
|
|
const greg_t sp = mctx->gregs[REG_RSP];
|
|
# else
|
|
const greg_t sp = mctx->gregs[REG_ESP];
|
|
# endif
|
|
# elif defined __APPLE__
|
|
const mcontext_t mctx = ctx->uc_mcontext;
|
|
# if defined(__LP64__)
|
|
const uintptr_t sp = mctx->__ss.__rsp;
|
|
# else
|
|
const uintptr_t sp = mctx->__ss.__esp;
|
|
# endif
|
|
# endif
|
|
enum {pagesize = 4096};
|
|
const uintptr_t sp_page = (uintptr_t)sp / pagesize;
|
|
const uintptr_t fault_page = addr / pagesize;
|
|
|
|
/* SP in ucontext is not decremented yet when `push` failed, so
|
|
* the fault page can be the next. */
|
|
if (sp_page == fault_page || sp_page == fault_page + 1) {
|
|
rb_thread_t *th = ruby_current_thread;
|
|
if ((uintptr_t)th->tag->buf / pagesize == sp_page) {
|
|
/* drop the last tag if it is close to the fault,
|
|
* otherwise it can cause stack overflow again at the same
|
|
* place. */
|
|
th->tag = th->tag->prev;
|
|
}
|
|
ruby_thread_stack_overflow(th);
|
|
}
|
|
}
|
|
#else
|
|
static void
|
|
check_stack_overflow(const void *addr)
|
|
{
|
|
int ruby_stack_overflowed_p(const rb_thread_t *, const void *);
|
|
rb_thread_t *th = ruby_current_thread;
|
|
if (ruby_stack_overflowed_p(th, addr)) {
|
|
ruby_thread_stack_overflow(th);
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef _WIN32
|
|
#define CHECK_STACK_OVERFLOW() check_stack_overflow(0)
|
|
#else
|
|
#define FAULT_ADDRESS info->si_addr
|
|
# ifdef USE_UCONTEXT_REG
|
|
# define CHECK_STACK_OVERFLOW() check_stack_overflow((uintptr_t)FAULT_ADDRESS, ctx)
|
|
#else
|
|
# define CHECK_STACK_OVERFLOW() check_stack_overflow(FAULT_ADDRESS)
|
|
#endif
|
|
#define MESSAGE_FAULT_ADDRESS " at %p", FAULT_ADDRESS
|
|
#endif
|
|
#else
|
|
#define CHECK_STACK_OVERFLOW() (void)0
|
|
#endif
|
|
#ifndef MESSAGE_FAULT_ADDRESS
|
|
#define MESSAGE_FAULT_ADDRESS
|
|
#endif
|
|
|
|
#ifdef SIGBUS
|
|
static RETSIGTYPE
|
|
sigbus(int sig SIGINFO_ARG)
|
|
{
|
|
/*
|
|
* Mac OS X makes KERN_PROTECTION_FAILURE when thread touch guard page.
|
|
* and it's delivered as SIGBUS instead of SIGSEGV to userland. It's crazy
|
|
* wrong IMHO. but anyway we have to care it. Sigh.
|
|
*/
|
|
#if defined __APPLE__
|
|
CHECK_STACK_OVERFLOW();
|
|
#endif
|
|
rb_bug_context(SIGINFO_CTX, "Bus Error" MESSAGE_FAULT_ADDRESS);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SIGSEGV
|
|
static void
|
|
ruby_abort(void)
|
|
{
|
|
#ifdef __sun
|
|
/* Solaris's abort() is async signal unsafe. Of course, it is not
|
|
* POSIX compliant.
|
|
*/
|
|
raise(SIGABRT);
|
|
#else
|
|
abort();
|
|
#endif
|
|
|
|
}
|
|
|
|
static int segv_received = 0;
|
|
extern int ruby_disable_gc_stress;
|
|
|
|
static RETSIGTYPE
|
|
sigsegv(int sig SIGINFO_ARG)
|
|
{
|
|
if (segv_received) {
|
|
ssize_t RB_UNUSED_VAR(err);
|
|
static const char msg[] = "SEGV received in SEGV handler\n";
|
|
|
|
err = write(2, msg, sizeof(msg));
|
|
ruby_abort();
|
|
}
|
|
|
|
CHECK_STACK_OVERFLOW();
|
|
|
|
segv_received = 1;
|
|
ruby_disable_gc_stress = 1;
|
|
rb_bug_context(SIGINFO_CTX, "Segmentation fault" MESSAGE_FAULT_ADDRESS);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
signal_exec(VALUE cmd, int safe, int sig)
|
|
{
|
|
rb_thread_t *cur_th = GET_THREAD();
|
|
volatile unsigned long old_interrupt_mask = cur_th->interrupt_mask;
|
|
int state;
|
|
|
|
/*
|
|
* workaround the following race:
|
|
* 1. signal_enque queues signal for execution
|
|
* 2. user calls trap(sig, "IGNORE"), setting SIG_IGN
|
|
* 3. rb_signal_exec runs on queued signal
|
|
*/
|
|
if (IMMEDIATE_P(cmd))
|
|
return;
|
|
|
|
cur_th->interrupt_mask |= TRAP_INTERRUPT_MASK;
|
|
TH_PUSH_TAG(cur_th);
|
|
if ((state = EXEC_TAG()) == 0) {
|
|
VALUE signum = INT2NUM(sig);
|
|
rb_eval_cmd(cmd, rb_ary_new3(1, signum), safe);
|
|
}
|
|
TH_POP_TAG();
|
|
cur_th = GET_THREAD();
|
|
cur_th->interrupt_mask = old_interrupt_mask;
|
|
|
|
if (state) {
|
|
/* XXX: should be replaced with rb_threadptr_pending_interrupt_enque() */
|
|
JUMP_TAG(state);
|
|
}
|
|
}
|
|
|
|
void
|
|
rb_trap_exit(void)
|
|
{
|
|
rb_vm_t *vm = GET_VM();
|
|
VALUE trap_exit = vm->trap_list[0].cmd;
|
|
|
|
if (trap_exit) {
|
|
vm->trap_list[0].cmd = 0;
|
|
signal_exec(trap_exit, vm->trap_list[0].safe, 0);
|
|
}
|
|
}
|
|
|
|
void
|
|
rb_signal_exec(rb_thread_t *th, int sig)
|
|
{
|
|
rb_vm_t *vm = GET_VM();
|
|
VALUE cmd = vm->trap_list[sig].cmd;
|
|
int safe = vm->trap_list[sig].safe;
|
|
|
|
if (cmd == 0) {
|
|
switch (sig) {
|
|
case SIGINT:
|
|
rb_interrupt();
|
|
break;
|
|
#ifdef SIGHUP
|
|
case SIGHUP:
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
case SIGQUIT:
|
|
#endif
|
|
#ifdef SIGTERM
|
|
case SIGTERM:
|
|
#endif
|
|
#ifdef SIGALRM
|
|
case SIGALRM:
|
|
#endif
|
|
#ifdef SIGUSR1
|
|
case SIGUSR1:
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
case SIGUSR2:
|
|
#endif
|
|
rb_threadptr_signal_raise(th, sig);
|
|
break;
|
|
}
|
|
}
|
|
else if (cmd == Qundef) {
|
|
rb_threadptr_signal_exit(th);
|
|
}
|
|
else {
|
|
signal_exec(cmd, safe, sig);
|
|
}
|
|
}
|
|
|
|
static sighandler_t
|
|
default_handler(int sig)
|
|
{
|
|
sighandler_t func;
|
|
switch (sig) {
|
|
case SIGINT:
|
|
#ifdef SIGHUP
|
|
case SIGHUP:
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
case SIGQUIT:
|
|
#endif
|
|
#ifdef SIGTERM
|
|
case SIGTERM:
|
|
#endif
|
|
#ifdef SIGALRM
|
|
case SIGALRM:
|
|
#endif
|
|
#ifdef SIGUSR1
|
|
case SIGUSR1:
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
case SIGUSR2:
|
|
#endif
|
|
func = sighandler;
|
|
break;
|
|
#ifdef SIGBUS
|
|
case SIGBUS:
|
|
func = (sighandler_t)sigbus;
|
|
break;
|
|
#endif
|
|
#ifdef SIGSEGV
|
|
case SIGSEGV:
|
|
func = (sighandler_t)sigsegv;
|
|
break;
|
|
#endif
|
|
#ifdef SIGPIPE
|
|
case SIGPIPE:
|
|
func = SIG_IGN;
|
|
break;
|
|
#endif
|
|
default:
|
|
func = SIG_DFL;
|
|
break;
|
|
}
|
|
|
|
return func;
|
|
}
|
|
|
|
static sighandler_t
|
|
trap_handler(VALUE *cmd, int sig)
|
|
{
|
|
sighandler_t func = sighandler;
|
|
VALUE command;
|
|
|
|
if (NIL_P(*cmd)) {
|
|
func = SIG_IGN;
|
|
}
|
|
else {
|
|
command = rb_check_string_type(*cmd);
|
|
if (NIL_P(command) && SYMBOL_P(*cmd)) {
|
|
command = rb_id2str(SYM2ID(*cmd));
|
|
if (!command) rb_raise(rb_eArgError, "bad handler");
|
|
}
|
|
if (!NIL_P(command)) {
|
|
SafeStringValue(command); /* taint check */
|
|
*cmd = command;
|
|
switch (RSTRING_LEN(command)) {
|
|
case 0:
|
|
goto sig_ign;
|
|
break;
|
|
case 14:
|
|
if (strncmp(RSTRING_PTR(command), "SYSTEM_DEFAULT", 14) == 0) {
|
|
func = SIG_DFL;
|
|
*cmd = 0;
|
|
}
|
|
break;
|
|
case 7:
|
|
if (strncmp(RSTRING_PTR(command), "SIG_IGN", 7) == 0) {
|
|
sig_ign:
|
|
func = SIG_IGN;
|
|
*cmd = Qtrue;
|
|
}
|
|
else if (strncmp(RSTRING_PTR(command), "SIG_DFL", 7) == 0) {
|
|
sig_dfl:
|
|
func = default_handler(sig);
|
|
*cmd = 0;
|
|
}
|
|
else if (strncmp(RSTRING_PTR(command), "DEFAULT", 7) == 0) {
|
|
goto sig_dfl;
|
|
}
|
|
break;
|
|
case 6:
|
|
if (strncmp(RSTRING_PTR(command), "IGNORE", 6) == 0) {
|
|
goto sig_ign;
|
|
}
|
|
break;
|
|
case 4:
|
|
if (strncmp(RSTRING_PTR(command), "EXIT", 4) == 0) {
|
|
*cmd = Qundef;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
rb_proc_t *proc;
|
|
GetProcPtr(*cmd, proc);
|
|
(void)proc;
|
|
}
|
|
}
|
|
|
|
return func;
|
|
}
|
|
|
|
static int
|
|
trap_signm(VALUE vsig)
|
|
{
|
|
int sig = -1;
|
|
const char *s;
|
|
|
|
switch (TYPE(vsig)) {
|
|
case T_FIXNUM:
|
|
sig = FIX2INT(vsig);
|
|
if (sig < 0 || sig >= NSIG) {
|
|
rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
|
|
}
|
|
break;
|
|
|
|
case T_SYMBOL:
|
|
s = rb_id2name(SYM2ID(vsig));
|
|
if (!s) rb_raise(rb_eArgError, "bad signal");
|
|
goto str_signal;
|
|
|
|
default:
|
|
s = StringValuePtr(vsig);
|
|
|
|
str_signal:
|
|
if (strncmp(signame_prefix, s, sizeof(signame_prefix)) == 0)
|
|
s += 3;
|
|
sig = signm2signo(s);
|
|
if (sig == 0 && strcmp(s, "EXIT") != 0)
|
|
rb_raise(rb_eArgError, "unsupported signal SIG%s", s);
|
|
}
|
|
return sig;
|
|
}
|
|
|
|
static VALUE
|
|
trap(int sig, sighandler_t func, VALUE command)
|
|
{
|
|
sighandler_t oldfunc;
|
|
VALUE oldcmd;
|
|
rb_vm_t *vm = GET_VM();
|
|
|
|
/*
|
|
* Be careful. ruby_signal() and trap_list[sig].cmd must be changed
|
|
* atomically. In current implementation, we only need to don't call
|
|
* RUBY_VM_CHECK_INTS().
|
|
*/
|
|
oldfunc = ruby_signal(sig, func);
|
|
oldcmd = vm->trap_list[sig].cmd;
|
|
switch (oldcmd) {
|
|
case 0:
|
|
case Qtrue:
|
|
if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
|
|
else if (oldfunc == SIG_DFL) oldcmd = rb_str_new2("SYSTEM_DEFAULT");
|
|
else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
|
|
else oldcmd = Qnil;
|
|
break;
|
|
case Qnil:
|
|
break;
|
|
case Qundef:
|
|
oldcmd = rb_str_new2("EXIT");
|
|
break;
|
|
}
|
|
|
|
vm->trap_list[sig].cmd = command;
|
|
vm->trap_list[sig].safe = rb_safe_level();
|
|
|
|
return oldcmd;
|
|
}
|
|
|
|
static int
|
|
reserved_signal_p(int signo)
|
|
{
|
|
/* Synchronous signal can't deliver to main thread */
|
|
#ifdef SIGSEGV
|
|
if (signo == SIGSEGV)
|
|
return 1;
|
|
#endif
|
|
#ifdef SIGBUS
|
|
if (signo == SIGBUS)
|
|
return 1;
|
|
#endif
|
|
#ifdef SIGILL
|
|
if (signo == SIGILL)
|
|
return 1;
|
|
#endif
|
|
#ifdef SIGFPE
|
|
if (signo == SIGFPE)
|
|
return 1;
|
|
#endif
|
|
|
|
/* used ubf internal see thread_pthread.c. */
|
|
#ifdef SIGVTALRM
|
|
if (signo == SIGVTALRM)
|
|
return 1;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* Signal.trap( signal, command ) -> obj
|
|
* Signal.trap( signal ) {| | block } -> obj
|
|
*
|
|
* Specifies the handling of signals. The first parameter is a signal
|
|
* name (a string such as ``SIGALRM'', ``SIGUSR1'', and so on) or a
|
|
* signal number. The characters ``SIG'' may be omitted from the
|
|
* signal name. The command or block specifies code to be run when the
|
|
* signal is raised.
|
|
* If the command is the string ``IGNORE'' or ``SIG_IGN'', the signal
|
|
* will be ignored.
|
|
* If the command is ``DEFAULT'' or ``SIG_DFL'', the Ruby's default handler
|
|
* will be invoked.
|
|
* If the command is ``EXIT'', the script will be terminated by the signal.
|
|
* If the command is ``SYSTEM_DEFAULT'', the operating system's default
|
|
* handler will be invoked.
|
|
* Otherwise, the given command or block will be run.
|
|
* The special signal name ``EXIT'' or signal number zero will be
|
|
* invoked just prior to program termination.
|
|
* trap returns the previous handler for the given signal.
|
|
*
|
|
* Signal.trap(0, proc { puts "Terminating: #{$$}" })
|
|
* Signal.trap("CLD") { puts "Child died" }
|
|
* fork && Process.wait
|
|
*
|
|
* produces:
|
|
* Terminating: 27461
|
|
* Child died
|
|
* Terminating: 27460
|
|
*/
|
|
static VALUE
|
|
sig_trap(int argc, VALUE *argv)
|
|
{
|
|
int sig;
|
|
sighandler_t func;
|
|
VALUE cmd;
|
|
|
|
rb_secure(2);
|
|
rb_check_arity(argc, 1, 2);
|
|
|
|
sig = trap_signm(argv[0]);
|
|
if (reserved_signal_p(sig)) {
|
|
const char *name = signo2signm(sig);
|
|
if (name)
|
|
rb_raise(rb_eArgError, "can't trap reserved signal: SIG%s", name);
|
|
else
|
|
rb_raise(rb_eArgError, "can't trap reserved signal: %d", sig);
|
|
}
|
|
|
|
if (argc == 1) {
|
|
cmd = rb_block_proc();
|
|
func = sighandler;
|
|
}
|
|
else {
|
|
cmd = argv[1];
|
|
func = trap_handler(&cmd, sig);
|
|
}
|
|
|
|
if (OBJ_TAINTED(cmd)) {
|
|
rb_raise(rb_eSecurityError, "Insecure: tainted signal trap");
|
|
}
|
|
|
|
return trap(sig, func, cmd);
|
|
}
|
|
|
|
/*
|
|
* call-seq:
|
|
* Signal.list -> a_hash
|
|
*
|
|
* Returns a list of signal names mapped to the corresponding
|
|
* underlying signal numbers.
|
|
*
|
|
* Signal.list #=> {"EXIT"=>0, "HUP"=>1, "INT"=>2, "QUIT"=>3, "ILL"=>4, "TRAP"=>5, "IOT"=>6, "ABRT"=>6, "FPE"=>8, "KILL"=>9, "BUS"=>7, "SEGV"=>11, "SYS"=>31, "PIPE"=>13, "ALRM"=>14, "TERM"=>15, "URG"=>23, "STOP"=>19, "TSTP"=>20, "CONT"=>18, "CHLD"=>17, "CLD"=>17, "TTIN"=>21, "TTOU"=>22, "IO"=>29, "XCPU"=>24, "XFSZ"=>25, "VTALRM"=>26, "PROF"=>27, "WINCH"=>28, "USR1"=>10, "USR2"=>12, "PWR"=>30, "POLL"=>29}
|
|
*/
|
|
static VALUE
|
|
sig_list(void)
|
|
{
|
|
VALUE h = rb_hash_new();
|
|
const struct signals *sigs;
|
|
|
|
for (sigs = siglist; sigs->signm; sigs++) {
|
|
rb_hash_aset(h, rb_str_new2(sigs->signm), INT2FIX(sigs->signo));
|
|
}
|
|
return h;
|
|
}
|
|
|
|
static void
|
|
install_sighandler(int signum, sighandler_t handler)
|
|
{
|
|
sighandler_t old;
|
|
|
|
/* At this time, there is no subthread. Then sigmask guarantee atomics. */
|
|
rb_disable_interrupt();
|
|
old = ruby_signal(signum, handler);
|
|
/* signal handler should be inherited during exec. */
|
|
if (old != SIG_DFL) {
|
|
ruby_signal(signum, old);
|
|
}
|
|
rb_enable_interrupt();
|
|
}
|
|
|
|
#if defined(SIGCLD) || defined(SIGCHLD)
|
|
static void
|
|
init_sigchld(int sig)
|
|
{
|
|
sighandler_t oldfunc;
|
|
|
|
rb_disable_interrupt();
|
|
oldfunc = ruby_signal(sig, SIG_DFL);
|
|
if (oldfunc != SIG_DFL && oldfunc != SIG_IGN) {
|
|
ruby_signal(sig, oldfunc);
|
|
}
|
|
else {
|
|
GET_VM()->trap_list[sig].cmd = 0;
|
|
}
|
|
rb_enable_interrupt();
|
|
}
|
|
#endif
|
|
|
|
void
|
|
ruby_sig_finalize(void)
|
|
{
|
|
sighandler_t oldfunc;
|
|
|
|
oldfunc = ruby_signal(SIGINT, SIG_IGN);
|
|
if (oldfunc == sighandler) {
|
|
ruby_signal(SIGINT, SIG_DFL);
|
|
}
|
|
}
|
|
|
|
|
|
int ruby_enable_coredump = 0;
|
|
#ifndef RUBY_DEBUG_ENV
|
|
#define ruby_enable_coredump 0
|
|
#endif
|
|
|
|
/*
|
|
* Many operating systems allow signals to be sent to running
|
|
* processes. Some signals have a defined effect on the process, while
|
|
* others may be trapped at the code level and acted upon. For
|
|
* example, your process may trap the USR1 signal and use it to toggle
|
|
* debugging, and may use TERM to initiate a controlled shutdown.
|
|
*
|
|
* pid = fork do
|
|
* Signal.trap("USR1") do
|
|
* $debug = !$debug
|
|
* puts "Debug now: #$debug"
|
|
* end
|
|
* Signal.trap("TERM") do
|
|
* puts "Terminating..."
|
|
* shutdown()
|
|
* end
|
|
* # . . . do some work . . .
|
|
* end
|
|
*
|
|
* Process.detach(pid)
|
|
*
|
|
* # Controlling program:
|
|
* Process.kill("USR1", pid)
|
|
* # ...
|
|
* Process.kill("USR1", pid)
|
|
* # ...
|
|
* Process.kill("TERM", pid)
|
|
*
|
|
* produces:
|
|
* Debug now: true
|
|
* Debug now: false
|
|
* Terminating...
|
|
*
|
|
* The list of available signal names and their interpretation is
|
|
* system dependent. Signal delivery semantics may also vary between
|
|
* systems; in particular signal delivery may not always be reliable.
|
|
*/
|
|
void
|
|
Init_signal(void)
|
|
{
|
|
VALUE mSignal = rb_define_module("Signal");
|
|
|
|
rb_define_global_function("trap", sig_trap, -1);
|
|
rb_define_module_function(mSignal, "trap", sig_trap, -1);
|
|
rb_define_module_function(mSignal, "list", sig_list, 0);
|
|
rb_define_module_function(mSignal, "signame", sig_signame, 1);
|
|
|
|
rb_define_method(rb_eSignal, "initialize", esignal_init, -1);
|
|
rb_define_method(rb_eSignal, "signo", esignal_signo, 0);
|
|
rb_alias(rb_eSignal, rb_intern("signm"), rb_intern("message"));
|
|
rb_define_method(rb_eInterrupt, "initialize", interrupt_init, -1);
|
|
|
|
install_sighandler(SIGINT, sighandler);
|
|
#ifdef SIGHUP
|
|
install_sighandler(SIGHUP, sighandler);
|
|
#endif
|
|
#ifdef SIGQUIT
|
|
install_sighandler(SIGQUIT, sighandler);
|
|
#endif
|
|
#ifdef SIGTERM
|
|
install_sighandler(SIGTERM, sighandler);
|
|
#endif
|
|
#ifdef SIGALRM
|
|
install_sighandler(SIGALRM, sighandler);
|
|
#endif
|
|
#ifdef SIGUSR1
|
|
install_sighandler(SIGUSR1, sighandler);
|
|
#endif
|
|
#ifdef SIGUSR2
|
|
install_sighandler(SIGUSR2, sighandler);
|
|
#endif
|
|
|
|
if (!ruby_enable_coredump) {
|
|
#ifdef SIGBUS
|
|
install_sighandler(SIGBUS, (sighandler_t)sigbus);
|
|
#endif
|
|
#ifdef SIGSEGV
|
|
# ifdef USE_SIGALTSTACK
|
|
rb_register_sigaltstack(GET_THREAD());
|
|
# endif
|
|
install_sighandler(SIGSEGV, (sighandler_t)sigsegv);
|
|
#endif
|
|
}
|
|
#ifdef SIGPIPE
|
|
install_sighandler(SIGPIPE, SIG_IGN);
|
|
#endif
|
|
|
|
#if defined(SIGCLD)
|
|
init_sigchld(SIGCLD);
|
|
#elif defined(SIGCHLD)
|
|
init_sigchld(SIGCHLD);
|
|
#endif
|
|
}
|