#! /bin/sh

# Test that glibc's signal numbers match the kernel's.

# Copyright (C) 2017-2018 Free Software Foundation, Inc.

# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public

# License as published by the Free Software Foundation; either

# version 2.1 of the License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public

# License along with the GNU C Library; if not, see

# <http://www.gnu.org/licenses/>.

set -e

if [ -n "$BASH_VERSION" ]; then set -o pipefail; fi

LC_ALL=C; export LC_ALL

# We cannot use Linux's asm/signal.h to define signal numbers, because

# it isn't sufficiently namespace-clean.  Instead, this test checks

# that our signal numbers match the kernel's.  This script expects

# "$@" to be $(CC) $(CPPFLAGS) as set by glibc's Makefiles, and $AWK

# to be set in the environment.

# Before doing anything else, fail if the compiler doesn't work.

"$@" -E -xc -dM - < /dev/null > /dev/null

tmpG=`mktemp -t signums_glibc.XXXXXXXXX`

tmpK=`mktemp -t signums_kernel.XXXXXXXXX`

trap "rm -f '$tmpG' '$tmpK'" 0

# Filter out constants that aren't signal numbers.

# If SIGPOLL is defined as SIGIO, swap it around so SIGIO is defined as

# SIGPOLL. Similarly for SIGABRT and SIGIOT.

# Discard obsolete signal numbers and unrelated constants:

#    SIGCLD, SIGIOT, SIGSWI, SIGUNUSED.

#    SIGSTKSZ, SIGRTMIN, SIGRTMAX.

# Then sort the list.

filter_defines ()

{

    $AWK '

/^#define SIG[A-Z]+ ([0-9]+|SIG[A-Z0-9]+)$/ { signals[$2] = $3 }

END {

  if ("SIGPOLL" in signals && "SIGIO" in signals &&

      signals["SIGPOLL"] == "SIGIO") {

    signals["SIGPOLL"] = signals["SIGIO"]

    signals["SIGIO"] = "SIGPOLL"

  }

  if ("SIGABRT" in signals && "SIGIOT" in signals &&

      signals["SIGABRT"] == "SIGIOT") {

    signals["SIGABRT"] = signals["SIGIOT"]

    signals["SIGIOT"] = "SIGABRT"

  }

  for (sig in signals) {

    if (sig !~ /^SIG(CLD|IOT|RT(MIN|MAX)|STKSZ|SWI|UNUSED)$/) {

      printf("#define %s %s\n", sig, signals[sig])

    }

  }

}' | sort

}

# $CC may contain command-line switches, so it should be word-split.

printf '%s' '#define _GNU_SOURCE 1

#include <signal.h>

' |

    "$@" -E -xc -dM - |

    filter_defines > "$tmpG"

printf '%s' '#define _GNU_SOURCE 1

#define __ASSEMBLER__ 1

#include <asm/signal.h>

' |

    "$@" -E -xc -dM - |

    filter_defines > "$tmpK"

if cmp -s "$tmpG" "$tmpK"; then

    exit 0

else

    diff -u "$tmpG" "$tmpK"

    exit 1

fi