sysdeps/unix/sysv/linux/tst-signal-numbers.sh

   1 #! /bin/sh
   2 # Test that glibc's signal numbers match the kernel's.
   3 # Copyright (C) 2017 Free Software Foundation, Inc.
   4 # This file is part of the GNU C Library.
   5
   6 # The GNU C Library is free software; you can redistribute it and/or
   7 # modify it under the terms of the GNU Lesser General Public
   8 # License as published by the Free Software Foundation; either
   9 # version 2.1 of the License, or (at your option) any later version.
  10
  11 # The GNU C Library is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 # Lesser General Public License for more details.
  15
  16 # You should have received a copy of the GNU Lesser General Public
  17 # License along with the GNU C Library; if not, see
  18 # <http://www.gnu.org/licenses/>.
  19
  20 set -e
  21 if [ -n "$BASH_VERSION" ]; then set -o pipefail; fi
  22 LC_ALL=C; export LC_ALL
  23
  24 # We cannot use Linux's asm/signal.h to define signal numbers, because
  25 # it isn't sufficiently namespace-clean.  Instead, this test checks
  26 # that our signal numbers match the kernel's.  This script expects
  27 # "$@" to be $(CC) $(CPPFLAGS) as set by glibc's Makefiles, and $AWK
  28 # to be set in the environment.
  29
  30 # Before doing anything else, fail if the compiler doesn't work.
  31 "$@" -E -xc -dM - < /dev/null > /dev/null
  32
  33 tmpG=`mktemp -t signums_glibc.XXXXXXXXX`
  34 tmpK=`mktemp -t signums_kernel.XXXXXXXXX`
  35 trap "rm -f '$tmpG' '$tmpK'" 0
  36
  37 # Filter out constants that aren't signal numbers.
  38 # If SIGPOLL is defined as SIGIO, swap it around so SIGIO is defined as
  39 # SIGPOLL. Similarly for SIGABRT and SIGIOT.
  40 # Discard obsolete signal numbers and unrelated constants:
  41 #    SIGCLD, SIGIOT, SIGSWI, SIGUNUSED.
  42 #    SIGSTKSZ, SIGRTMIN, SIGRTMAX.
  43 # Then sort the list.
  44 filter_defines ()
  45 {
  46     $AWK '
  47 /^#define SIG[A-Z]+ ([0-9]+|SIG[A-Z0-9]+)$/ { signals[$2] = $3 }
  48 END {
  49   if ("SIGPOLL" in signals && "SIGIO" in signals &&
  50       signals["SIGPOLL"] == "SIGIO") {
  51     signals["SIGPOLL"] = signals["SIGIO"]
  52     signals["SIGIO"] = "SIGPOLL"
  53   }
  54   if ("SIGABRT" in signals && "SIGIOT" in signals &&
  55       signals["SIGABRT"] == "SIGIOT") {
  56     signals["SIGABRT"] = signals["SIGIOT"]
  57     signals["SIGIOT"] = "SIGABRT"
  58   }
  59   for (sig in signals) {
  60     if (sig !~ /^SIG(CLD|IOT|RT(MIN|MAX)|STKSZ|SWI|UNUSED)$/) {
  61       printf("#define %s %s\n", sig, signals[sig])
  62     }
  63   }
  64 }' | sort
  65 }
  66
  67 # $CC may contain command-line switches, so it should be word-split.
  68 printf '%s' '#define _GNU_SOURCE 1
  69 #include <signal.h>
  70 ' |
  71     "$@" -E -xc -dM - |
  72     filter_defines > "$tmpG"
  73
  74 printf '%s' '#define _GNU_SOURCE 1
  75 #define __ASSEMBLER__ 1
  76 #include <asm/signal.h>
  77 ' |
  78     "$@" -E -xc -dM - |
  79     filter_defines > "$tmpK"
  80
  81 if cmp -s "$tmpG" "$tmpK"; then
  82     exit 0
  83 else
  84     diff -u "$tmpG" "$tmpK"
  85     exit 1
  86 fi