Import sources from 2011-03-30 iso image - sys/include

1 files changed, 716 insertions, 0 deletions

diff --git a/sys/include/libc.h b/sys/include/libc.h
new file mode 100755
index 000000000..d6c49aaea
--- /dev/null
+++ b/sys/include/libc.h
@@ -0,0 +1,716 @@
+#pragma	lib	"libc.a"
+#pragma	src	"/sys/src/libc"
+
+#define	nelem(x)	(sizeof(x)/sizeof((x)[0]))
+#define	offsetof(s, m)	(ulong)(&(((s*)0)->m))
+#define	assert(x)	if(x){}else _assert("x")
+
+/*
+ * mem routines
+ */
+extern	void*	memccpy(void*, void*, int, ulong);
+extern	void*	memset(void*, int, ulong);
+extern	int	memcmp(void*, void*, ulong);
+extern	void*	memcpy(void*, void*, ulong);
+extern	void*	memmove(void*, void*, ulong);
+extern	void*	memchr(void*, int, ulong);
+
+/*
+ * string routines
+ */
+extern	char*	strcat(char*, char*);
+extern	char*	strchr(char*, int);
+extern	int	strcmp(char*, char*);
+extern	char*	strcpy(char*, char*);
+extern	char*	strecpy(char*, char*, char*);
+extern	char*	strdup(char*);
+extern	char*	strncat(char*, char*, long);
+extern	char*	strncpy(char*, char*, long);
+extern	int	strncmp(char*, char*, long);
+extern	char*	strpbrk(char*, char*);
+extern	char*	strrchr(char*, int);
+extern	char*	strtok(char*, char*);
+extern	long	strlen(char*);
+extern	long	strspn(char*, char*);
+extern	long	strcspn(char*, char*);
+extern	char*	strstr(char*, char*);
+extern	int	cistrncmp(char*, char*, int);
+extern	int	cistrcmp(char*, char*);
+extern	char*	cistrstr(char*, char*);
+extern	int	tokenize(char*, char**, int);
+
+enum
+{
+	UTFmax		= 3,		/* maximum bytes per rune */
+	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
+	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
+	Runeerror	= 0xFFFD,	/* decoding error in UTF */
+};
+
+/*
+ * rune routines
+ */
+extern	int	runetochar(char*, Rune*);
+extern	int	chartorune(Rune*, char*);
+extern	int	runelen(long);
+extern	int	runenlen(Rune*, int);
+extern	int	fullrune(char*, int);
+extern	int	utflen(char*);
+extern	int	utfnlen(char*, long);
+extern	char*	utfrune(char*, long);
+extern	char*	utfrrune(char*, long);
+extern	char*	utfutf(char*, char*);
+extern	char*	utfecpy(char*, char*, char*);
+
+extern	Rune*	runestrcat(Rune*, Rune*);
+extern	Rune*	runestrchr(Rune*, Rune);
+extern	int	runestrcmp(Rune*, Rune*);
+extern	Rune*	runestrcpy(Rune*, Rune*);
+extern	Rune*	runestrncpy(Rune*, Rune*, long);
+extern	Rune*	runestrecpy(Rune*, Rune*, Rune*);
+extern	Rune*	runestrdup(Rune*);
+extern	Rune*	runestrncat(Rune*, Rune*, long);
+extern	int	runestrncmp(Rune*, Rune*, long);
+extern	Rune*	runestrrchr(Rune*, Rune);
+extern	long	runestrlen(Rune*);
+extern	Rune*	runestrstr(Rune*, Rune*);
+
+extern	Rune	tolowerrune(Rune);
+extern	Rune	totitlerune(Rune);
+extern	Rune	toupperrune(Rune);
+extern	int	isalpharune(Rune);
+extern	int	islowerrune(Rune);
+extern	int	isspacerune(Rune);
+extern	int	istitlerune(Rune);
+extern	int	isupperrune(Rune);
+extern	int	isdigitrune(Rune);
+
+/*
+ * malloc
+ */
+extern	void*	malloc(ulong);
+extern	void*	mallocz(ulong, int);
+extern	void	free(void*);
+extern	ulong	msize(void*);
+extern	void*	mallocalign(ulong, ulong, long, ulong);
+extern	void*	calloc(ulong, ulong);
+extern	void*	realloc(void*, ulong);
+extern	void	setmalloctag(void*, ulong);
+extern	void	setrealloctag(void*, ulong);
+extern	ulong	getmalloctag(void*);
+extern	ulong	getrealloctag(void*);
+extern	void*	malloctopoolblock(void*);
+
+/*
+ * print routines
+ */
+typedef struct Fmt	Fmt;
+struct Fmt{
+	uchar	runes;			/* output buffer is runes or chars? */
+	void	*start;			/* of buffer */
+	void	*to;			/* current place in the buffer */
+	void	*stop;			/* end of the buffer; overwritten if flush fails */
+	int	(*flush)(Fmt *);	/* called when to == stop */
+	void	*farg;			/* to make flush a closure */
+	int	nfmt;			/* num chars formatted so far */
+	va_list	args;			/* args passed to dofmt */
+	int	r;			/* % format Rune */
+	int	width;
+	int	prec;
+	ulong	flags;
+};
+
+enum{
+	FmtWidth	= 1,
+	FmtLeft		= FmtWidth << 1,
+	FmtPrec		= FmtLeft << 1,
+	FmtSharp	= FmtPrec << 1,
+	FmtSpace	= FmtSharp << 1,
+	FmtSign		= FmtSpace << 1,
+	FmtZero		= FmtSign << 1,
+	FmtUnsigned	= FmtZero << 1,
+	FmtShort	= FmtUnsigned << 1,
+	FmtLong		= FmtShort << 1,
+	FmtVLong	= FmtLong << 1,
+	FmtComma	= FmtVLong << 1,
+	FmtByte		= FmtComma << 1,
+
+	FmtFlag		= FmtByte << 1
+};
+
+extern	int	print(char*, ...);
+extern	char*	seprint(char*, char*, char*, ...);
+extern	char*	vseprint(char*, char*, char*, va_list);
+extern	int	snprint(char*, int, char*, ...);
+extern	int	vsnprint(char*, int, char*, va_list);
+extern	char*	smprint(char*, ...);
+extern	char*	vsmprint(char*, va_list);
+extern	int	sprint(char*, char*, ...);
+extern	int	fprint(int, char*, ...);
+extern	int	vfprint(int, char*, va_list);
+
+extern	int	runesprint(Rune*, char*, ...);
+extern	int	runesnprint(Rune*, int, char*, ...);
+extern	int	runevsnprint(Rune*, int, char*, va_list);
+extern	Rune*	runeseprint(Rune*, Rune*, char*, ...);
+extern	Rune*	runevseprint(Rune*, Rune*, char*, va_list);
+extern	Rune*	runesmprint(char*, ...);
+extern	Rune*	runevsmprint(char*, va_list);
+
+extern	int	fmtfdinit(Fmt*, int, char*, int);
+extern	int	fmtfdflush(Fmt*);
+extern	int	fmtstrinit(Fmt*);
+extern	char*	fmtstrflush(Fmt*);
+extern	int	runefmtstrinit(Fmt*);
+extern	Rune*	runefmtstrflush(Fmt*);
+
+#pragma	varargck	argpos	fmtprint	2
+#pragma	varargck	argpos	fprint		2
+#pragma	varargck	argpos	print		1
+#pragma	varargck	argpos	runeseprint	3
+#pragma	varargck	argpos	runesmprint	1
+#pragma	varargck	argpos	runesnprint	3
+#pragma	varargck	argpos	runesprint	2
+#pragma	varargck	argpos	seprint		3
+#pragma	varargck	argpos	smprint		1
+#pragma	varargck	argpos	snprint		3
+#pragma	varargck	argpos	sprint		2
+
+#pragma	varargck	type	"lld"	vlong
+#pragma	varargck	type	"llx"	vlong
+#pragma	varargck	type	"lld"	uvlong
+#pragma	varargck	type	"llx"	uvlong
+#pragma	varargck	type	"ld"	long
+#pragma	varargck	type	"lx"	long
+#pragma	varargck	type	"lb"	long
+#pragma	varargck	type	"ld"	ulong
+#pragma	varargck	type	"lx"	ulong
+#pragma	varargck	type	"lb"	ulong
+#pragma	varargck	type	"d"	int
+#pragma	varargck	type	"x"	int
+#pragma	varargck	type	"c"	int
+#pragma	varargck	type	"C"	int
+#pragma	varargck	type	"b"	int
+#pragma	varargck	type	"d"	uint
+#pragma	varargck	type	"x"	uint
+#pragma	varargck	type	"c"	uint
+#pragma	varargck	type	"C"	uint
+#pragma	varargck	type	"b"	uint
+#pragma	varargck	type	"f"	double
+#pragma	varargck	type	"e"	double
+#pragma	varargck	type	"g"	double
+#pragma	varargck	type	"s"	char*
+#pragma	varargck	type	"q"	char*
+#pragma	varargck	type	"S"	Rune*
+#pragma	varargck	type	"Q"	Rune*
+#pragma	varargck	type	"r"	void
+#pragma	varargck	type	"%"	void
+#pragma	varargck	type	"n"	int*
+#pragma	varargck	type	"p"	uintptr
+#pragma	varargck	type	"p"	void*
+#pragma	varargck	flag	','
+#pragma	varargck	flag	' '
+#pragma	varargck	flag	'h'
+#pragma varargck	type	"<"	void*
+#pragma varargck	type	"["	void*
+#pragma varargck	type	"H"	void*
+#pragma varargck	type	"lH"	void*
+
+extern	int	fmtinstall(int, int (*)(Fmt*));
+extern	int	dofmt(Fmt*, char*);
+extern	int	dorfmt(Fmt*, Rune*);
+extern	int	fmtprint(Fmt*, char*, ...);
+extern	int	fmtvprint(Fmt*, char*, va_list);
+extern	int	fmtrune(Fmt*, int);
+extern	int	fmtstrcpy(Fmt*, char*);
+extern	int	fmtrunestrcpy(Fmt*, Rune*);
+/*
+ * error string for %r
+ * supplied on per os basis, not part of fmt library
+ */
+extern	int	errfmt(Fmt *f);
+
+/*
+ * quoted strings
+ */
+extern	char	*unquotestrdup(char*);
+extern	Rune	*unquoterunestrdup(Rune*);
+extern	char	*quotestrdup(char*);
+extern	Rune	*quoterunestrdup(Rune*);
+extern	int	quotestrfmt(Fmt*);
+extern	int	quoterunestrfmt(Fmt*);
+extern	void	quotefmtinstall(void);
+extern	int	(*doquote)(int);
+extern	int	needsrcquote(int);
+
+/*
+ * random number
+ */
+extern	void	srand(long);
+extern	int	rand(void);
+extern	int	nrand(int);
+extern	long	lrand(void);
+extern	long	lnrand(long);
+extern	double	frand(void);
+extern	ulong	truerand(void);			/* uses /dev/random */
+extern	ulong	ntruerand(ulong);		/* uses /dev/random */
+
+/*
+ * math
+ */
+extern	ulong	getfcr(void);
+extern	void	setfsr(ulong);
+extern	ulong	getfsr(void);
+extern	void	setfcr(ulong);
+extern	double	NaN(void);
+extern	double	Inf(int);
+extern	int	isNaN(double);
+extern	int	isInf(double, int);
+extern	ulong	umuldiv(ulong, ulong, ulong);
+extern	long	muldiv(long, long, long);
+
+extern	double	pow(double, double);
+extern	double	atan2(double, double);
+extern	double	fabs(double);
+extern	double	atan(double);
+extern	double	log(double);
+extern	double	log10(double);
+extern	double	exp(double);
+extern	double	floor(double);
+extern	double	ceil(double);
+extern	double	hypot(double, double);
+extern	double	sin(double);
+extern	double	cos(double);
+extern	double	tan(double);
+extern	double	asin(double);
+extern	double	acos(double);
+extern	double	sinh(double);
+extern	double	cosh(double);
+extern	double	tanh(double);
+extern	double	sqrt(double);
+extern	double	fmod(double, double);
+
+#define	HUGE	3.4028234e38
+#define	PIO2	1.570796326794896619231e0
+#define	PI	(PIO2+PIO2)
+
+/*
+ * Time-of-day
+ */
+
+typedef
+struct Tm
+{
+	int	sec;
+	int	min;
+	int	hour;
+	int	mday;
+	int	mon;
+	int	year;
+	int	wday;
+	int	yday;
+	char	zone[4];
+	int	tzoff;
+} Tm;
+
+extern	Tm*	gmtime(long);
+extern	Tm*	localtime(long);
+extern	char*	asctime(Tm*);
+extern	char*	ctime(long);
+extern	double	cputime(void);
+extern	long	times(long*);
+extern	long	tm2sec(Tm*);
+extern	vlong	nsec(void);
+
+extern	void	cycles(uvlong*);	/* 64-bit value of the cycle counter if there is one, 0 if there isn't */
+
+/*
+ * one-of-a-kind
+ */
+enum
+{
+	PNPROC		= 1,
+	PNGROUP		= 2,
+};
+
+extern	void	_assert(char*);
+extern	int	abs(int);
+extern	int	atexit(void(*)(void));
+extern	void	atexitdont(void(*)(void));
+extern	int	atnotify(int(*)(void*, char*), int);
+extern	double	atof(char*);
+extern	int	atoi(char*);
+extern	long	atol(char*);
+extern	vlong	atoll(char*);
+extern	double	charstod(int(*)(void*), void*);
+extern	char*	cleanname(char*);
+extern	int	decrypt(void*, void*, int);
+extern	int	encrypt(void*, void*, int);
+extern	int	dec64(uchar*, int, char*, int);
+extern	int	enc64(char*, int, uchar*, int);
+extern	int	dec32(uchar*, int, char*, int);
+extern	int	enc32(char*, int, uchar*, int);
+extern	int	dec16(uchar*, int, char*, int);
+extern	int	enc16(char*, int, uchar*, int);
+extern	int	encodefmt(Fmt*);
+extern	void	exits(char*);
+extern	double	frexp(double, int*);
+extern	uintptr	getcallerpc(void*);
+extern	char*	getenv(char*);
+extern	int	getfields(char*, char**, int, int, char*);
+extern	int	gettokens(char *, char **, int, char *);
+extern	char*	getuser(void);
+extern	char*	getwd(char*, int);
+extern	int	iounit(int);
+extern	long	labs(long);
+extern	double	ldexp(double, int);
+extern	void	longjmp(jmp_buf, int);
+extern	char*	mktemp(char*);
+extern	double	modf(double, double*);
+extern	int	netcrypt(void*, void*);
+extern	void	notejmp(void*, jmp_buf, int);
+extern	void	perror(char*);
+extern	int	postnote(int, int, char *);
+extern	double	pow10(int);
+extern	int	putenv(char*, char*);
+extern	void	qsort(void*, long, long, int (*)(void*, void*));
+extern	int	setjmp(jmp_buf);
+extern	double	strtod(char*, char**);
+extern	long	strtol(char*, char**, int);
+extern	ulong	strtoul(char*, char**, int);
+extern	vlong	strtoll(char*, char**, int);
+extern	uvlong	strtoull(char*, char**, int);
+extern	void	sysfatal(char*, ...);
+#pragma	varargck	argpos	sysfatal	1
+extern	void	syslog(int, char*, char*, ...);
+#pragma	varargck	argpos	syslog	3
+extern	long	time(long*);
+extern	int	tolower(int);
+extern	int	toupper(int);
+
+/*
+ *  profiling
+ */
+enum {
+	Profoff,		/* No profiling */
+	Profuser,		/* Measure user time only (default) */
+	Profkernel,		/* Measure user + kernel time */
+	Proftime,		/* Measure total time */
+	Profsample,		/* Use clock interrupt to sample (default when there is no cycle counter) */
+}; /* what */
+extern	void	prof(void (*fn)(void*), void *arg, int entries, int what);
+
+/*
+ *  synchronization
+ */
+typedef
+struct Lock {
+	int	val;
+} Lock;
+
+extern int	_tas(int*);
+
+extern	void	lock(Lock*);
+extern	void	unlock(Lock*);
+extern	int	canlock(Lock*);
+
+typedef struct QLp QLp;
+struct QLp
+{
+	int	inuse;
+	QLp	*next;
+	char	state;
+};
+
+typedef
+struct QLock
+{
+	Lock	lock;
+	int	locked;
+	QLp	*head;
+	QLp 	*tail;
+} QLock;
+
+extern	void	qlock(QLock*);
+extern	void	qunlock(QLock*);
+extern	int	canqlock(QLock*);
+extern	void	_qlockinit(void* (*)(void*, void*));	/* called only by the thread library */
+
+typedef
+struct RWLock
+{
+	Lock	lock;
+	int	readers;	/* number of readers */
+	int	writer;		/* number of writers */
+	QLp	*head;		/* list of waiting processes */
+	QLp	*tail;
+} RWLock;
+
+extern	void	rlock(RWLock*);
+extern	void	runlock(RWLock*);
+extern	int	canrlock(RWLock*);
+extern	void	wlock(RWLock*);
+extern	void	wunlock(RWLock*);
+extern	int	canwlock(RWLock*);
+
+typedef
+struct Rendez
+{
+	QLock	*l;
+	QLp	*head;
+	QLp	*tail;
+} Rendez;
+
+extern	void	rsleep(Rendez*);	/* unlocks r->l, sleeps, locks r->l again */
+extern	int	rwakeup(Rendez*);
+extern	int	rwakeupall(Rendez*);
+extern	void**	privalloc(void);
+extern	void	privfree(void**);
+
+/*
+ *  network dialing
+ */
+#define NETPATHLEN 40
+extern	int	accept(int, char*);
+extern	int	announce(char*, char*);
+extern	int	dial(char*, char*, char*, int*);
+extern	void	setnetmtpt(char*, int, char*);
+extern	int	hangup(int);
+extern	int	listen(char*, char*);
+extern	char*	netmkaddr(char*, char*, char*);
+extern	int	reject(int, char*, char*);
+
+/*
+ *  encryption
+ */
+extern	int	pushssl(int, char*, char*, char*, int*);
+extern	int	pushtls(int, char*, char*, int, char*, char*);
+
+/*
+ *  network services
+ */
+typedef struct NetConnInfo NetConnInfo;
+struct NetConnInfo
+{
+	char	*dir;		/* connection directory */
+	char	*root;		/* network root */
+	char	*spec;		/* binding spec */
+	char	*lsys;		/* local system */
+	char	*lserv;		/* local service */
+	char	*rsys;		/* remote system */
+	char	*rserv;		/* remote service */
+	char	*laddr;		/* local address */
+	char	*raddr;		/* remote address */
+};
+extern	NetConnInfo*	getnetconninfo(char*, int);
+extern	void		freenetconninfo(NetConnInfo*);
+
+/*
+ * system calls
+ *
+ */
+#define	STATMAX	65535U	/* max length of machine-independent stat structure */
+#define	DIRMAX	(sizeof(Dir)+STATMAX)	/* max length of Dir structure */
+#define	ERRMAX	128	/* max length of error string */
+
+#define	MORDER	0x0003	/* mask for bits defining order of mounting */
+#define	MREPL	0x0000	/* mount replaces object */
+#define	MBEFORE	0x0001	/* mount goes before others in union directory */
+#define	MAFTER	0x0002	/* mount goes after others in union directory */
+#define	MCREATE	0x0004	/* permit creation in mounted directory */
+#define	MCACHE	0x0010	/* cache some data */
+#define	MMASK	0x0017	/* all bits on */
+
+#define	OREAD	0	/* open for read */
+#define	OWRITE	1	/* write */
+#define	ORDWR	2	/* read and write */
+#define	OEXEC	3	/* execute, == read but check execute permission */
+#define	OTRUNC	16	/* or'ed in (except for exec), truncate file first */
+#define	OCEXEC	32	/* or'ed in, close on exec */
+#define	ORCLOSE	64	/* or'ed in, remove on close */
+#define	OEXCL	0x1000	/* or'ed in, exclusive use (create only) */
+
+#define	AEXIST	0	/* accessible: exists */
+#define	AEXEC	1	/* execute access */
+#define	AWRITE	2	/* write access */
+#define	AREAD	4	/* read access */
+
+/* Segattch */
+#define	SG_RONLY	0040	/* read only */
+#define	SG_CEXEC	0100	/* detach on exec */
+
+#define	NCONT	0	/* continue after note */
+#define	NDFLT	1	/* terminate after note */
+#define	NSAVE	2	/* clear note but hold state */
+#define	NRSTR	3	/* restore saved state */
+
+/* bits in Qid.type */
+#define QTDIR		0x80		/* type bit for directories */
+#define QTAPPEND	0x40		/* type bit for append only files */
+#define QTEXCL		0x20		/* type bit for exclusive use files */
+#define QTMOUNT		0x10		/* type bit for mounted channel */
+#define QTAUTH		0x08		/* type bit for authentication file */
+#define QTTMP		0x04		/* type bit for not-backed-up file */
+#define QTFILE		0x00		/* plain file */
+
+/* bits in Dir.mode */
+#define DMDIR		0x80000000	/* mode bit for directories */
+#define DMAPPEND	0x40000000	/* mode bit for append only files */
+#define DMEXCL		0x20000000	/* mode bit for exclusive use files */
+#define DMMOUNT		0x10000000	/* mode bit for mounted channel */
+#define DMAUTH		0x08000000	/* mode bit for authentication file */
+#define DMTMP		0x04000000	/* mode bit for non-backed-up files */
+#define DMREAD		0x4		/* mode bit for read permission */
+#define DMWRITE		0x2		/* mode bit for write permission */
+#define DMEXEC		0x1		/* mode bit for execute permission */
+
+/* rfork */
+enum
+{
+	RFNAMEG		= (1<<0),
+	RFENVG		= (1<<1),
+	RFFDG		= (1<<2),
+	RFNOTEG		= (1<<3),
+	RFPROC		= (1<<4),
+	RFMEM		= (1<<5),
+	RFNOWAIT	= (1<<6),
+	RFCNAMEG	= (1<<10),
+	RFCENVG		= (1<<11),
+	RFCFDG		= (1<<12),
+	RFREND		= (1<<13),
+	RFNOMNT		= (1<<14)
+};
+
+typedef
+struct Qid
+{
+	uvlong	path;
+	ulong	vers;
+	uchar	type;
+} Qid;
+
+typedef
+struct Dir {
+	/* system-modified data */
+	ushort	type;	/* server type */
+	uint	dev;	/* server subtype */
+	/* file data */
+	Qid	qid;	/* unique id from server */
+	ulong	mode;	/* permissions */
+	ulong	atime;	/* last read time */
+	ulong	mtime;	/* last write time */
+	vlong	length;	/* file length */
+	char	*name;	/* last element of path */
+	char	*uid;	/* owner name */
+	char	*gid;	/* group name */
+	char	*muid;	/* last modifier name */
+} Dir;
+
+/* keep /sys/src/ape/lib/ap/plan9/sys9.h in sync with this -rsc */
+typedef
+struct Waitmsg
+{
+	int	pid;		/* of loved one */
+	ulong	time[3];	/* of loved one & descendants */
+	char	*msg;
+} Waitmsg;
+
+typedef
+struct IOchunk
+{
+	void	*addr;
+	ulong	len;
+} IOchunk;
+
+extern	void	_exits(char*);
+
+extern	void	abort(void);
+extern	int	access(char*, int);
+extern	long	alarm(ulong);
+extern	int	await(char*, int);
+extern	int	bind(char*, char*, int);
+extern	int	brk(void*);
+extern	int	chdir(char*);
+extern	int	close(int);
+extern	int	create(char*, int, ulong);
+extern	int	dup(int, int);
+extern	int	errstr(char*, uint);
+extern	int	exec(char*, char*[]);
+extern	int	execl(char*, ...);
+extern	int	fork(void);
+extern	int	rfork(int);
+extern	int	fauth(int, char*);
+extern	int	fstat(int, uchar*, int);
+extern	int	fwstat(int, uchar*, int);
+extern	int	fversion(int, int, char*, int);
+extern	int	mount(int, int, char*, int, char*);
+extern	int	unmount(char*, char*);
+extern	int	noted(int);
+extern	int	notify(void(*)(void*, char*));
+extern	int	open(char*, int);
+extern	int	fd2path(int, char*, int);
+extern	int	pipe(int*);
+extern	long	pread(int, void*, long, vlong);
+extern	long	preadv(int, IOchunk*, int, vlong);
+extern	long	pwrite(int, void*, long, vlong);
+extern	long	pwritev(int, IOchunk*, int, vlong);
+extern	long	read(int, void*, long);
+extern	long	readn(int, void*, long);
+extern	long	readv(int, IOchunk*, int);
+extern	int	remove(char*);
+extern	void*	sbrk(ulong);
+extern	long	oseek(int, long, int);
+extern	vlong	seek(int, vlong, int);
+extern	void*	segattach(int, char*, void*, ulong);
+extern	void*	segbrk(void*, void*);
+extern	int	segdetach(void*);
+extern	int	segflush(void*, ulong);
+extern	int	segfree(void*, ulong);
+extern	int	semacquire(long*, int);
+extern	long	semrelease(long*, long);
+extern	int	sleep(long);
+extern	int	stat(char*, uchar*, int);
+extern	Waitmsg*	wait(void);
+extern	int	waitpid(void);
+extern	long	write(int, void*, long);
+extern	long	writev(int, IOchunk*, int);
+extern	int	wstat(char*, uchar*, int);
+extern	void*	rendezvous(void*, void*);
+
+extern	Dir*	dirstat(char*);
+extern	Dir*	dirfstat(int);
+extern	int	dirwstat(char*, Dir*);
+extern	int	dirfwstat(int, Dir*);
+extern	long	dirread(int, Dir**);
+extern	void	nulldir(Dir*);
+extern	long	dirreadall(int, Dir**);
+extern	int	getpid(void);
+extern	int	getppid(void);
+extern	void	rerrstr(char*, uint);
+extern	char*	sysname(void);
+extern	void	werrstr(char*, ...);
+#pragma	varargck	argpos	werrstr	1
+
+extern char *argv0;
+#define	ARGBEGIN	for((argv0||(argv0=*argv)),argv++,argc--;\
+			    argv[0] && argv[0][0]=='-' && argv[0][1];\
+			    argc--, argv++) {\
+				char *_args, *_argt;\
+				Rune _argc;\
+				_args = &argv[0][1];\
+				if(_args[0]=='-' && _args[1]==0){\
+					argc--; argv++; break;\
+				}\
+				_argc = 0;\
+				while(*_args && (_args += chartorune(&_argc, _args)))\
+				switch(_argc)
+#define	ARGEND		SET(_argt);USED(_argt,_argc,_args);}USED(argv, argc);
+#define	ARGF()		(_argt=_args, _args="",\
+				(*_argt? _argt: argv[1]? (argc--, *++argv): 0))
+#define	EARGF(x)	(_argt=_args, _args="",\
+				(*_argt? _argt: argv[1]? (argc--, *++argv): ((x), abort(), (char*)0)))
+
+#define	ARGC()		_argc
+
+/* this is used by sbrk and brk,  it's a really bad idea to redefine it */
+extern	char	end[];