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8082d91e1c
Many of the things defined by bits/signum.h are invariant across all supported operating systems. This patch factors out all of them to a new header bits/signum-generic.h, which each bits/signum.h will include and then override whichever things need adjustment. Normally that will mean, at most, adding or changing a few signal numbers. A user-visible side effect is that the obsolete signal constant SIGUNUSED (which is an alias for SIGSYS on all platforms that define it) is no longer exposed by any version of bits/signum.h. A side effect only relevant to glibc hackers is that _NSIG is now defined in terms of __SIGRTMAX, instead of the other way around. This is because __SIGRTMAX varies from platform to platform, but _NSIG==__SIGRTMAX+1 is true universally. If your platform doesn't support realtime signals, leave __SIGRTMAX equal to __SIGRTMIN. I also added a Linux-specific test to make sure that our signal constants match the ones in <asm/signal.h>, since we can't use that header (it's not even vaguely namespace-clean). * bits/signum-generic.h: Renamed from bits/signum.h. Add proper multiple include guard and misuse check. Define __SIGRTMIN = __SIGRTMAX = 32, and define _NSIG = __SIGRTMAX+1. Move definition of SIGIO to "archaic names for compatibility" section. * bits/signum.h: New file which just includes bits/signum-generic.h. * sysdeps/unix/bsd/bits/signum.h * sysdeps/unix/sysv/linux/bits/signum.h * sysdeps/unix/sysv/linux/alpha/bits/signum.h * sysdeps/unix/sysv/linux/hppa/bits/signum.h * sysdeps/unix/sysv/linux/mips/bits/signum.h * sysdeps/unix/sysv/linux/sparc/bits/signum.h Just include <bits/signum-generic.h> and then add or adjust signal constants. Do not define SIGUNUSED, SIGRTMIN, or SIGRTMAX. * signal/Makefile: Install bits/signum-generic.h. * signal/signal.h: Define SIGRTMIN and SIGRTMAX here. * sysdeps/generic/siglist.h: SIGSYS and SIGWINCH are universal. Prefer SIGPOLL to SIGIO. Simplify #ifdeffage. * sysdeps/unix/sysv/linux/tst-signal-numbers.sh: New test. * sysdeps/unix/sysv/linux/Makefile: Run it.
87 lines
2.7 KiB
Bash
87 lines
2.7 KiB
Bash
#! /bin/sh
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# Test that glibc's signal numbers match the kernel's.
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# Copyright (C) 2017 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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set -e
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if [ -n "$BASH_VERSION" ]; then set -o pipefail; fi
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LC_ALL=C; export LC_ALL
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# We cannot use Linux's asm/signal.h to define signal numbers, because
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# it isn't sufficiently namespace-clean. Instead, this test checks
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# that our signal numbers match the kernel's. This script expects
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# "$@" to be $(CC) $(CPPFLAGS) as set by glibc's Makefiles, and $AWK
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# to be set in the environment.
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# Before doing anything else, fail if the compiler doesn't work.
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"$@" -E -xc -dM - < /dev/null > /dev/null
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tmpG=`mktemp -t signums_glibc.XXXXXXXXX`
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tmpK=`mktemp -t signums_kernel.XXXXXXXXX`
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trap "rm -f '$tmpG' '$tmpK'" 0
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# Filter out constants that aren't signal numbers.
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# If SIGPOLL is defined as SIGIO, swap it around so SIGIO is defined as
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# SIGPOLL. Similarly for SIGABRT and SIGIOT.
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# Discard obsolete signal numbers and unrelated constants:
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# SIGCLD, SIGIOT, SIGSWI, SIGUNUSED.
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# SIGSTKSZ, SIGRTMIN, SIGRTMAX.
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# Then sort the list.
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filter_defines ()
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{
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$AWK '
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/^#define SIG[A-Z]+ ([0-9]+|SIG[A-Z0-9]+)$/ { signals[$2] = $3 }
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END {
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if ("SIGPOLL" in signals && "SIGIO" in signals &&
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signals["SIGPOLL"] == "SIGIO") {
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signals["SIGPOLL"] = signals["SIGIO"]
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signals["SIGIO"] = "SIGPOLL"
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}
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if ("SIGABRT" in signals && "SIGIOT" in signals &&
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signals["SIGABRT"] == "SIGIOT") {
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signals["SIGABRT"] = signals["SIGIOT"]
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signals["SIGIOT"] = "SIGABRT"
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}
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for (sig in signals) {
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if (sig !~ /^SIG(CLD|IOT|RT(MIN|MAX)|STKSZ|SWI|UNUSED)$/) {
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printf("#define %s %s\n", sig, signals[sig])
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}
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}
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}' | sort
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}
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# $CC may contain command-line switches, so it should be word-split.
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printf '%s' '#define _GNU_SOURCE 1
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#include <signal.h>
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' |
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"$@" -E -xc -dM - |
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filter_defines > "$tmpG"
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printf '%s' '#define _GNU_SOURCE 1
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#define __ASSEMBLER__ 1
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#include <asm/signal.h>
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' |
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"$@" -E -xc -dM - |
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filter_defines > "$tmpK"
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if cmp -s "$tmpG" "$tmpK"; then
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exit 0
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else
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diff -u "$tmpG" "$tmpK"
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exit 1
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fi
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