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cde/src/lib/libast/features/sig.sh
Martijn Dekker 3de4da5afb Remove Microsoft/Cygwin import/export nonsense
Windows/Cygwin requires onerous special handling and the definition
of additional _imp__* symbols to import/export symbols between
dynamically linked binaries. Its support in AST used a lot of
macros and code obfuscation. In the features/common test for this,
AT&T called this the "Microsoft import/export nonsense".

They're right, it's nonsense. Somehow, Microsoft's POSIX layer,
SFU/Interix, always managed without it. No one has time to maintain
this (especially considering how incredibly sluggish Cygwin is).
And in fact, it had already fallen victim to bit rot; I confirmed
this in my early experiments with reintroducing dynamic library
support. No one has time to fix it, either.

So, my apologies to any Cygwin fans; ksh 93u+m will never support
dynamically loadable built-ins on Cygwin, even when I do manage to
reintroduce dynamic linking properly.
2022-07-21 23:27:37 +02:00

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########################################################################
# #
# This software is part of the ast package #
# Copyright (c) 1985-2011 AT&T Intellectual Property #
# Copyright (c) 2020-2022 Contributors to ksh 93u+m #
# and is licensed under the #
# Eclipse Public License, Version 1.0 #
# by AT&T Intellectual Property #
# #
# A copy of the License is available at #
# http://www.eclipse.org/org/documents/epl-v10.html #
# (with md5 checksum b35adb5213ca9657e911e9befb180842) #
# #
# Information and Software Systems Research #
# AT&T Research #
# Florham Park NJ #
# #
# Glenn Fowler <gsf@research.att.com> #
# David Korn <dgk@research.att.com> #
# Phong Vo <kpv@research.att.com> #
# #
########################################################################
: generate sig features
case $ZSH_VERSION in
?*) emulate ksh ;;
*) (command set -o posix) 2>/dev/null && set -o posix ;;
esac
case $# in
0) ;;
*) eval $1
shift
;;
esac
echo "#include <signal.h>
int xxx;" > $tmp.c
$cc -c $tmp.c >/dev/null 2>$tmp.e
echo "#define sig_info _sig_info_
#define kill ______kill
#define killpg ______killpg
#include <signal.h>
#undef kill
#undef killpg
#ifndef sigmask
#define sigmask(s) (1<<((s)-1))
#endif"
echo "#include <signal.h>
#ifdef TYPE
typedef TYPE (*Sig_handler_t)(ARG);
#endif
Sig_handler_t f()
{
Sig_handler_t handler;
handler = signal(1, SIG_IGN);
return(handler);
}" > $tmp.c
if $cc -c $tmp.c >/dev/null
then :
else e=`wc -l $tmp.e`
i1= j1=
for i in void int
do for j in int,... ... int
do $cc -c -DTYPE=$i -DARG=$j $tmp.c >/dev/null 2>$tmp.e || continue
case `wc -l $tmp.e` in
$e) i1= j1=; break 2 ;;
esac
case $i1 in
"") i1=$i j1=$j ;;
esac
done
done
case $i1 in
?*) i=$i1 j=$j1 ;;
esac
echo "typedef $i (*Sig_handler_t)($j);"
fi
echo '
#define Handler_t Sig_handler_t
#define SIG_REG_PENDING (-1)
#define SIG_REG_POP 0
#define SIG_REG_EXEC 00001
#define SIG_REG_PROC 00002
#define SIG_REG_TERM 00004
#define SIG_REG_ALL 00777
#define SIG_REG_SET 01000
typedef struct
{
char** name;
char** text;
int sigmax;
} Sig_info_t;
extern int kill(pid_t, int);
extern int killpg(pid_t, int);
extern Sig_info_t sig_info;
#if _lib_sigflag && _npt_sigflag
extern int sigflag(int, int, int);
#endif
#if !_lib_sigflag
extern int sigflag(int, int, int);
#endif
extern int sigcritical(int);
extern int sigunblock(int);'