hdr	dl,dlfcn,dll,rld_interface,mach-o/dyld
sys	ldr
lib	dlopen -ldl
lib	dllload,loadbind,shl_load -ldl
tst	dll_DYNAMIC link{
	#include <sys/types.h>
	#include <link.h>
	extern struct link_dynamic _DYNAMIC;
	int
	main(void)
	{
		return _DYNAMIC.ld_version;
	}
}end
tst	run{
	lib=
	for d in  /lib64 /usr/lib64 /lib /usr/lib
	do	if	test -d $d
		then	for s in "*.*" "*[!a]*"
			do	for b in libc
				do	for i in $d/$b.$s
					do	if	test -f $i
						then	lib=$i
						fi
					done
					case $lib in
					?*)	break 3 ;;
					esac
				done
			done
		fi
	done
	case $lib in
	*.[0-9]*.[0-9]*)
		i=`echo $lib | sed 's,\([^0-9]*[0-9]*\).*,\1,'`
		if	test -f $i
		then	lib=$i
		fi
		;;
	esac
	# some run time linkers barf with /lib/xxx if
	# /usr/lib/xxx is there
	case $lib in
	/usr*)	;;
	*)	if	test -f /usr$lib
		then	lib=/usr$lib
		fi
		;;
	esac
	case $lib in
	"")	lib=/lib/libc.so.1 ;;
	esac
	case $lib in
	/usr/lib64/*|/usr/lib/*)
		case `package` in
		sgi.mips3)
			abi=/lib32
			;;
		sgi.mips4)
			abi=/lib64
			;;
		*)	abi=
			;;
		esac
		case $abi in
		?*)	if	test -d $abi
			then	lib=`echo $lib | sed 's,/usr/lib\(64\)\?/,,'`
				lib=$abi/$lib
			fi
			;;
		esac
		;;
	esac
	echo "#define _DLL_NEXT_PATH	\"$lib\""
}end

# try once with -lm, once without
tst	- -lm - - output{
	#include <math.h>
	#if defined(__MVS__) && !defined(__SUSV3)
	#define __SUSV3		1
	#endif
	#if _hdr_dlfcn && _lib_dlopen
	#include <dlfcn.h>
	#endif
	#if _hdr_rld_interface
	#include <rld_interface.h>
	#endif
	int
	main(void)
	{
		int		i;
	#if _hdr_rld_interface
		void*		dll;
		static char*	local[] = { "__elf_header", "_call_add_gp_range", "_etext" };
	#endif
		printf("\n");
		printf("#if defined(__MVS__) && !defined(__SUSV3)\n");
		printf("#define __SUSV3		1\n");
		printf("#endif\n");
	#if _hdr_dlfcn && _lib_dlopen
		printf("#include <dlfcn.h>\n");
	#endif
	#ifndef RTLD_LAZY
		i = 0;
		printf("\n");
		printf("#define RTLD_LAZY	1\n");
	#else
		i = 1;
	#endif
	#ifndef RTLD_NOW
		if (i)
		{
			i = 0;
			printf("\n");
		}
		printf("#define RTLD_NOW	2\n");
	#endif
	#ifndef RTLD_GLOBAL
		if (i)
		{
			i = 0;
			printf("\n");
		}
		printf("#define RTLD_GLOBAL	0\n");
	#endif
	#ifndef RTLD_LOCAL
		if (i)
		{
			i = 0;
			printf("\n");
		}
		printf("#define RTLD_LOCAL	0\n");
	#endif
	#ifndef RTLD_PARENT
		if (i)
		{
			i = 0;
			printf("\n");
		}
		printf("#define RTLD_PARENT	0\n");
	#endif
	#if defined(_hdr_mach_o_dyld) && !defined(RTLD_NEXT)
		if (i)
		{
			i = 0;
			printf("\n");
		}
		printf("#define RTLD_NEXT	((void*)16)\n");
	#endif
	#if _hdr_rld_interface
		if (!(dll = dlopen(0, RTLD_LAZY)))
			i = -1;
		else
		{
			for (i = 0; i < sizeof(local) / sizeof(local[0]); i++)
				if (dlsym(dll, local[i]))
					break;
			if (i >= sizeof(local) / sizeof(local[0]))
				i = -1;
		}
		if (i >= 0)
		{
			printf("\n");
			printf("#define _DLL_RLD_SYM		%s\n", local[i]);
			printf("#define _DLL_RLD_SYM_STR	\"%s\"\n", local[i]);
			printf("#define _DLL_RLD_SYM_TYPE	void*\n");
		}
	#endif
		printf("\n");
		printf("#define DLL_INFO_PREVER	0x0001	/* pre-suffix style version */\n");
		printf("#define DLL_INFO_DOTVER	0x0002	/* post-suffix style version */\n");
		printf("\n");
		printf("typedef unsigned long (*Dll_plugin_version_f)(void);\n");
		printf("typedef int (*Dllerror_f)(void*, void*, int, ...);\n");
		printf("\n");
		printf("typedef struct Dllinfo_s\n");
		printf("{\n");
		printf("	char**	sibling;	/* sibling dirs on $PATH */\n");
		printf("	char*	prefix;		/* library name prefix */\n");
		printf("	char*	suffix;		/* library name suffix */\n");
		printf("	char*	env;		/* library path env var */\n");
		printf("	int	flags;		/* DLL_INFO_* flags */\n");
		printf("#ifdef _DLLINFO_PRIVATE_\n");
		printf("	_DLLINFO_PRIVATE_\n");
		printf("#endif\n");
		printf("} Dllinfo_t;\n");
		printf("\n");
		printf("typedef struct Dllnames_s\n");
		printf("{\n");
		printf("	char*		id;\n");
		printf("	char*		name;\n");
		printf("	char*		base;\n");
		printf("	char*		type;\n");
		printf("	char*		opts;\n");
		printf("	char*		path;\n");
		printf("	char		data[1024];\n");
		printf("} Dllnames_t;\n");
		printf("\n");
		printf("typedef struct Dllent_s\n");
		printf("{\n");
		printf("	char*		path;\n");
		printf("	char*		name;\n");
		printf("#ifdef _DLLENT_PRIVATE_\n");
		printf("	_DLLENT_PRIVATE_\n");
		printf("#endif\n");
		printf("} Dllent_t;\n");
		printf("\n");
		printf("typedef struct Dllscan_s\n");
		printf("{\n");
		printf("	void*		pad;\n");
		printf("#ifdef _DLLSCAN_PRIVATE_\n");
		printf("	_DLLSCAN_PRIVATE_\n");
		printf("#endif\n");
		printf("} Dllscan_t;\n");
	#if !_hdr_dlfcn || !_lib_dlopen
		printf("\n");
		printf("extern void*		dlopen(const char*, int);\n");
		printf("extern void*		dlsym(void*, const char*);\n");
		printf("extern int		dlclose(void*);\n");
		printf("extern char*		dlerror(void);\n");
	#endif
		printf("\n");
		printf("extern Dllinfo_t*	dllinfo(void);\n");
		printf("extern void*		dllplugin(const char*, const char*, const char*, unsigned long, unsigned long*, int, char*, size_t);\n");
		printf("extern void*		dllplug(const char*, const char*, const char*, int, char*, size_t);\n");
		printf("extern void*		dllfind(const char*, const char*, int, char*, size_t);\n");
		printf("extern Dllnames_t*	dllnames(const char*, const char*, Dllnames_t*);\n");
		printf("extern void*		dll_lib(Dllnames_t*, unsigned long, Dllerror_f, void*);\n");
		printf("extern void*		dllmeth(const char*, const char*, unsigned long);\n");
		printf("extern void*		dllopen(const char*, int);\n");
		printf("extern void*		dllnext(int);\n");
		printf("extern void*		dlllook(void*, const char*);\n");
		printf("extern int		dllcheck(void*, const char*, unsigned long, unsigned long*);\n");
		printf("extern unsigned long	dllversion(void*, const char*);\n");
		printf("extern char*		dllerror(int);\n");
	#if _hdr_rld_interface
		if (i >= 0)
		{
			printf("\n");
			printf("extern void*		_dll_next(int, _DLL_RLD_SYM_TYPE*);\n");
			printf("#define dllnext(f)	_dll_next(f, &_DLL_RLD_SYM)\n");
		}
	#endif
		printf("\n");
		printf("extern Dllscan_t*	dllsopen(const char*, const char*, const char*);\n");
		printf("extern Dllent_t*	dllsread(Dllscan_t*);\n");
		printf("extern int		dllsclose(Dllscan_t*);\n");
	#if _hdr_rld_interface
		if (i >= 0)
		{
			printf("\n");
			printf("extern _DLL_RLD_SYM_TYPE _DLL_RLD_SYM;\n");
		}
	#endif
		printf("\n");
		return 0;
	}
}end fail{
	case ${_features_dll_TRIEDONCE-no} in
	no)	_features_dll_TRIEDONCE=yes ;;
	*)	echo "$0: Output block failed to compile. Export IFFEFLAGS=-d1 to debug." >&2
		exit 1 ;;
	esac
}end
