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Viewing file:     mksigtab.sh (6.46 KB)      -rw-r--r--

#!/bin/sh

# Copyright 2016 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

# Create sigtab.go from gen-sysinfo.go.

# This shell scripts creates the sigtab.go file, which maps signals to
# their dispositions.  We generate a file so that we can build a
# composite literal that only refers to signals that are defined on
# this system.

# This script simply writes to standard output.

set -e

echo '// Generated by mksigtab.sh.  Do not edit.'
echo
echo 'package runtime'
echo
echo 'var sigtable = [...]sigTabT{'

SIGLIST=""

# Handle signals valid on all Unix systems.

addsig() {
    # Get the signal number and add it to SIGLIST
    signum=`grep "const $1 = " gen-sysinfo.go | sed -e 's/.* = //'`
    if echo "$signum" | grep '^_SIG[A-Z0-9_]*$' >/dev/null 2>&1; then
        # Recurse once to obtain signal number
        # This is needed for some MIPS signals defined as aliases of other signals
        signum=`grep "const $signum = " gen-sysinfo.go | sed -e 's/.* = //'`
    fi
    # Only add signal if the signal number isn't in the list yet.
    # For example, musl libc uses signal 29 for both SIGIO and SIGPOLL.
    if ! echo "$SIGLIST" | grep "_${signum}_" >/dev/null 2>&1; then
        echo "	$1: $2,"
        SIGLIST=$SIGLIST"_${signum}_"
    fi
}

echo '	0:          {0, "SIGNONE: no trap"},'
addsig _SIGHUP     '{_SigNotify + _SigKill, "SIGHUP: terminal line hangup"}'
addsig _SIGINT     '{_SigNotify + _SigKill, "SIGINT: interrupt"}'
addsig _SIGQUIT    '{_SigNotify + _SigThrow, "SIGQUIT: quit"}'
addsig _SIGILL     '{_SigThrow + _SigUnblock, "SIGILL: illegal instruction"}'
addsig _SIGTRAP    '{_SigThrow + _SigUnblock, "SIGTRAP: trace trap"}'
addsig _SIGABRT    '{_SigNotify + _SigThrow, "SIGABRT: abort"}'
addsig _SIGBUS     '{_SigPanic + _SigUnblock, "SIGBUS: bus error"}'
addsig _SIGFPE     '{_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"}'
addsig _SIGKILL    '{0, "SIGKILL: kill"}'
addsig _SIGUSR1    '{_SigNotify, "SIGUSR1: user-defined signal 1"}'
addsig _SIGSEGV    '{_SigPanic + _SigUnblock, "SIGSEGV: segmentation violation"}'
addsig _SIGUSR2    '{_SigNotify, "SIGUSR2: user-defined signal 2"}'
addsig _SIGPIPE    '{_SigNotify, "SIGPIPE: write to broken pipe"}'
addsig _SIGALRM    '{_SigNotify, "SIGALRM: alarm clock"}'
addsig _SIGTERM    '{_SigNotify + _SigKill, "SIGTERM: termination"}'
addsig _SIGCHLD    '{_SigNotify + _SigUnblock, "SIGCHLD: child status has changed"}'
addsig _SIGCONT    '{_SigNotify + _SigDefault, "SIGCONT: continue"}'
addsig _SIGSTOP    '{0, "SIGSTOP: stop"}'
addsig _SIGTSTP    '{_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"}'
addsig _SIGTTIN    '{_SigNotify + _SigDefault, "SIGTTIN: background read from tty"}'
addsig _SIGTTOU    '{_SigNotify + _SigDefault, "SIGTTOU: background write to tty"}'
addsig _SIGURG     '{_SigNotify, "SIGURG: urgent condition on socket"}'
addsig _SIGXCPU    '{_SigNotify, "SIGXCPU: cpu limit exceeded"}'
addsig _SIGXFSZ    '{_SigNotify, "SIGXFSZ: file size limit exceeded"}'
addsig _SIGVTALRM  '{_SigNotify, "SIGVTALRM: virtual alarm clock"}'
addsig _SIGPROF    '{_SigNotify + _SigUnblock, "SIGPROF: profiling alarm clock"}'
addsig _SIGWINCH   '{_SigNotify, "SIGWINCH: window size change"}'
addsig _SIGSYS     '{_SigThrow, "SIGSYS: bad system call"}'

# Handle signals that are not supported on all systems.

checksig() {
    if grep "const $1 = " gen-sysinfo.go >/dev/null 2>&1 \
	&& ! grep "const $1 = _SIG" gen-sysinfo.go > /dev/null 2>&1; then
	addsig $1 "$2"
    fi
}

checksig _SIGSTKFLT  '{_SigThrow + _SigUnblock, "SIGSTKFLT: stack fault"}'
checksig _SIGIO      '{_SigNotify, "SIGIO: i/o now possible"}'
checksig _SIGPWR     '{_SigNotify, "SIGPWR: power failure restart"}'
checksig _SIGEMT     '{_SigThrow, "SIGEMT: emulate instruction executed"}'
checksig _SIGINFO    '{_SigNotify, "SIGINFO: status request from keyboard"}'
checksig _SIGTHR     '{_SigNotify, "SIGTHR: reserved"}'
checksig _SIGPOLL    '{_SigNotify, "SIGPOLL: pollable event occurred"}'
checksig _SIGWAITING '{_SigNotify, "SIGWAITING: reserved signal no longer used by"}'
checksig _SIGLWP     '{_SigNotify, "SIGLWP: reserved signal no longer used by"}'
checksig _SIGFREEZE  '{_SigNotify, "SIGFREEZE: special signal used by CPR"}'
checksig _SIGTHAW    '{_SigNotify, "SIGTHAW: special signal used by CPR"}'
checksig _SIGCANCEL  '{_SigSetStack + _SigUnblock, "SIGCANCEL: reserved signal for thread cancellation"}'
checksig _SIGXRES    '{_SigNotify, "SIGXRES: resource control exceeded"}'
checksig _SIGJVM1    '{_SigNotify, "SIGJVM1: reserved signal for Java Virtual Machine"}'
checksig _SIGJVM2    '{_SigNotify, "SIGJVM2: reserved signal for Java Virtual Machine"}'
checksig _SIGLOST '   {_SigNotify, "SIGLOST: resource lost (Sun); server died (GNU)"}'

# Special handling of signals 32 and 33 on GNU/Linux systems,
# because they are special to glibc.
# Signal 34 is additionally special to Linux systems with musl.
if test "${GOOS}" = "linux"; then
    SIGLIST=$SIGLIST"_32__33__34_"
    echo '	32: {_SigSetStack + _SigUnblock, "signal 32"}, /* SIGCANCEL; see issue 6997 */'
    echo '	33: {_SigSetStack + _SigUnblock, "signal 33"}, /* SIGSETXID; see issues 3871, 9400, 12498 */'
    echo '	34: {_SigSetStack + _SigUnblock, "signal 34"}, /* musl SIGSYNCCALL; see issue 39343 */'
fi

if test "${GOOS}" = "aix"; then
    # _NSIG = _NSIG32/_NSIG64 and _NSIG* = _SIGMAX* + 1
    bits=`grep 'const _NSIG = _NSIG[0-9]*$' gen-sysinfo.go | sed -e 's/.* = _NSIG\([0-9]*\)/\1/'`
    nsig=`grep "const _SIGMAX$bits = [0-9]*$" gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
    nsig=`expr $nsig + 1`
else
    nsig=`grep 'const _*NSIG = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
    if test -z "$nsig"; then
	if grep 'const _*NSIG = [ (]*_*SIGRTMAX + 1[ )]*' gen-sysinfo.go >/dev/null 2>&1; then
	    rtmax=`grep 'const _*SIGRTMAX = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
	    if test -n "$rtmax"; then
		nsig=`expr $rtmax + 1`
	    elif grep 'const _*SIGRTMAX = [ (]*_*SIGRTMIN[ )]*' gen-sysinfo.go >/dev/null 2>&1; then
		rtmin=`grep 'const _*SIGRTMIN = [0-9]*$' gen-sysinfo.go | sed -e 's/.* = \([0-9]*\)/\1/'`
		if test -n "$rtmin"; then
		    nsig=`expr $rtmin + 1`
		fi
	    fi
	fi
    fi
fi

if test -z "$nsig"; then
    echo 1>&2 "could not determine number of signals"
    exit 1
fi

i=1
# Fill in the remaining signal numbers in sigtable
while test "$i" -lt "$nsig"; do
    if ! echo $SIGLIST | grep "_${i}_" >/dev/null 2>&1; then
	echo "	$i: {_SigNotify, \"signal $i\"},"
    fi
    i=`expr "$i" + 1`
done
echo '}'