set	prototyped

header	sys/types.h
header	pty.h
header	libutil.h
header	sys/pty.h
header	sys/ptyio.h
header	sys/vty.h
header	sys/ioctl.h
header	stropts.h

lib	openpty,_getpty,ptsname -lutil
lib	grantpt,unlockpt,posix_openpt stdlib.h

tst - output{
	#include	<stdio.h>
	#include	<sys/types.h>
	#include	<sys/stat.h>
	#if _lib_ptsname && _npt_ptsname
	_BEGIN_EXTERNS_
	#if _STD_
		extern char*	ptsname(int);
	#else
		extern char*	ptsname();
	#endif
	#endif
	_END_EXTERNS_
	int main()
	{
		int		i;
		struct stat	statb;
		static char*	pty[] = { "/dev/ptyp0000", "/dev/ptym/ptyp0", "/dev/ptyp0" };
	#if _lib_ptsname
		int		fd;
		static char*	ptc[] = { "/dev/ptmx", "/dev/ptc", "/dev/ptmx_bsd" };

		for (i = 0; i < sizeof(ptc) / sizeof(ptc[0]); i++)
			if((fd = open(ptc[i], 2))>=0)
			{
				if (ptsname(fd))
				{
					printf("#define _pty_clone\t\"%s\"\n", ptc[i]);
					close(fd);
					break;
				}
				close(fd);
			}
	#endif
		for (i = 0;; i++)
			if(i >= (sizeof(pty) / sizeof(pty[0]) - 1) || stat(pty[i], &statb)>=0)
			{
				printf("#define _pty_first\t\"%s\"\n", pty[i]);
				break;
			}
		return 0;
	}
}end fail{
	echo '#error The output block in src/cmd/builtin/features/pty failed to compile. Rebuild with IFFEFLAGS=-d1 to debug.'
}end

extern	_getpty		char*		(int*, int, mode_t, int)
extern	openpty		int		(int*, int*, char*, struct termios*, struct winsize*)
extern	ptsname		char*		(int)