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 * Lib9 is miscellany from the Plan 9 C library that doesn't
 * fit into libutf or into libfmt, but is still missing from traditional
 * Unix C libraries.
#ifndef _LIBC_H_
#define _LIBC_H_ 1
#if defined(__cplusplus)
extern "C" {

 * Begin usual libc.h 

#ifndef nil
#define     nil   ((void*)0)
#define     nelem(x)    (sizeof(x)/sizeof((x)[0]))

#ifndef offsetof
#define offsetof(s, m)  (ulong)(&(((s*)0)->m))

 * mem routines (provided by system <string.h>)
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 (provided by system <string.h>)
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* p9strdup(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);

      UTFmax            = 3,
      Runesync    = 0x80,
      Runeself    = 0x80,
      Runeerror   = 0x80,

 * rune routines (provided by <utf.h>
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);

 * malloc (provied by system <stdlib.h>)
extern      void* malloc(ulong);
extern      void* p9malloc(ulong);
extern      void* mallocz(ulong, int);
extern      void  p9free(void*);
extern      void* p9calloc(ulong, ulong);
extern      void* p9realloc(void*, ulong);
extern      void        setmalloctag(void*, ulong);
extern      void        setrealloctag(void*, ulong);
extern      ulong getmalloctag(void*);
extern      ulong getrealloctag(void*);
extern      void* malloctopoolblock(void*);
#define     malloc      p9malloc
#define     realloc     p9realloc
#define     calloc      p9calloc
#define     free  p9free
#undef strdup
#define     strdup      p9strdup

 * print routines (provided by <fmt.h>)
typedef struct Fmt      Fmt;
struct Fmt{
      uchar runes;
      void  *start;
      void  *to;
      void  *stop;
      int   (*flush)(Fmt *);
      void  *farg;
      int   nfmt;
      va_list     args;
      int   r;
      int   width;
      int   prec;
      ulong flags;

      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*);

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
 * (provided by lib9, but declared in fmt.h)
extern      int   errfmt(Fmt *f);

 * quoted strings
extern      char  *unquotestrdup(char*);
extern      Rune  *unquoterunestrdup(Rune*);
extern      char  *quotestrdup(char*);
extern      Rune  *quoterunestrdup(Rune*);
 * in fmt.h
extern      void  quotefmtinstall(void);
extern      int   quotestrfmt(Fmt*);
extern      int   quoterunestrfmt(Fmt*);
#define doquote fmtdoquote
extern      int   needsrcquote(int);

 * random number
extern      void  p9srand(long);
extern      int   p9rand(void);

extern      int   p9nrand(int);
extern      long  p9lrand(void);
extern      long  p9lnrand(long);
extern      double      p9frand(void);
extern      ulong truerand(void);               /* uses /dev/random */
extern      ulong ntruerand(ulong);       /* uses /dev/random */

#define     srand p9srand
#define     rand  p9rand
#define     nrand p9nrand
#define     lrand p9lrand
#define     lnrand      p9lnrand
#define     frand p9frand

 * 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);

 * provided by math.h
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)
#define PI  M_PI
#define     PIO2  M_PI_2

 * Time-of-day

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*   p9gmtime(long);
extern      Tm*   p9localtime(long);
extern      char* p9asctime(Tm*);
extern      char* p9ctime(long);
extern      double      p9cputime(void);
extern      long  p9times(long*);
extern      long  p9tm2sec(Tm*);
extern      vlong p9nsec(void);

#define     gmtime            p9gmtime
#define     localtime   p9localtime
#define     asctime           p9asctime
#define     ctime       p9ctime
#define     cputime           p9cputime
#define     times       p9times
#define     tm2sec            p9tm2sec
#define     nsec        p9nsec

 * one-of-a-kind
      PNPROC            = 1,
      PNGROUP           = 2,

/* extern   int   abs(int); <stdlib.h> */
extern      int   p9atexit(void(*)(void));
extern      void  p9atexitdont(void(*)(void));
extern      int   atnotify(int(*)(void*, char*), int);
 * <stdlib.h>
extern      double      atof(char*); <stdlib.h>
extern      int   p9atoi(char*);
extern      long  p9atol(char*);
extern      vlong p9atoll(char*);
extern      double      fmtcharstod(int(*)(void*), void*);
extern      char* cleanname(char*);
extern      int   p9decrypt(void*, void*, int);
extern      int   p9encrypt(void*, void*, int);
extern      int   netcrypt(void*, void*);
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      int   dirmodefmt(Fmt*);
extern      void  exits(char*);
extern      double      frexp(double, int*);
/*extern    ulong getcallerpc(void*);*/
extern      char* p9getenv(char*);
extern      int   p9putenv(char*, char*);
extern      int   getfields(char*, char**, int, int, char*);
extern      int   gettokens(char *, char **, int, char *);
extern      char* getuser(void);
extern      char* p9getwd(char*, int);
extern      int   iounit(int);
/* extern   long  labs(long); <math.h> */
/* extern   double      ldexp(double, int); <math.h> */
extern      void  p9longjmp(p9jmp_buf, int);
extern      char* mktemp(char*);
extern      int         opentemp(char*);
/* extern   double      modf(double, double*); <math.h> */
extern      void  p9notejmp(void*, p9jmp_buf, int);
extern      void  perror(const char*);
extern      int   postnote(int, int, char *);
extern      double      p9pow10(int);
/* extern   int   putenv(char*, char*); <stdlib.h. */
/* extern   void  qsort(void*, long, long, int (*)(void*, void*)); <stdlib.h> */
extern      char* searchpath(char*);
/* extern   int   p9setjmp(p9jmp_buf); */
#define p9setjmp(b)     sigsetjmp((void*)(b), 1)
 * <stdlib.h>
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*, ...);
extern      void  p9syslog(int, char*, char*, ...);
extern      long  p9time(long*);
/* extern   int   tolower(int); <ctype.h> */
/* extern   int   toupper(int); <ctype.h> */
extern      void  needstack(int);
extern      char* readcons(char*, char*, int);

#define atexit          p9atexit
#define atexitdont      p9atexitdont
#define atoi            p9atoi
#define atol            p9atol
#define atoll           p9atoll
#define encrypt         p9encrypt
#define decrypt         p9decrypt
#define getenv          p9getenv
#define     getwd       p9getwd
#define     longjmp           p9longjmp
#undef  setjmp
#define setjmp          p9setjmp
#define putenv          p9putenv
#define notejmp         p9notejmp
#define jmp_buf         p9jmp_buf
#define time            p9time
#define pow10           p9pow10
#define strtod          fmtstrtod
#define charstod  fmtcharstod
#define syslog          p9syslog

 *  just enough information so that libc can be
 *  properly locked without dragging in all of libthread
typedef struct _Thread _Thread;
typedef struct _Threadlist _Threadlist;
struct _Threadlist
      _Thread     *head;
      _Thread     *tail;

extern      _Thread     *(*threadnow)(void);

 *  synchronization
typedef struct Lock Lock;
struct Lock
      int init;
      pthread_mutex_t mutex;
      int held;

extern      void  lock(Lock*);
extern      void  unlock(Lock*);
extern      int   canlock(Lock*);
extern      int   (*_lock)(Lock*, int, ulong);
extern      void  (*_unlock)(Lock*, ulong);     

typedef struct QLock QLock;
struct QLock
      Lock        l;
      _Thread     *owner;
      _Threadlist waiting;

extern      void  qlock(QLock*);
extern      void  qunlock(QLock*);
extern      int   canqlock(QLock*);
extern      int   (*_qlock)(QLock*, int, ulong);      /* do not use */
extern      void  (*_qunlock)(QLock*, ulong);

typedef struct Rendez Rendez;
struct Rendez
      QLock *l;
      _Threadlist waiting;

extern      void  rsleep(Rendez*);  /* unlocks r->l, sleeps, locks r->l again */
extern      int   rwakeup(Rendez*);
extern      int   rwakeupall(Rendez*);
extern      void  (*_rsleep)(Rendez*, ulong);   /* do not use */
extern      int   (*_rwakeup)(Rendez*, int, ulong);

typedef struct RWLock RWLock;
struct RWLock
      Lock        l;
      int   readers;
      _Thread     *writer;
      _Threadlist rwaiting;
      _Threadlist wwaiting;

extern      void  rlock(RWLock*);
extern      void  runlock(RWLock*);
extern      int         canrlock(RWLock*);
extern      void  wlock(RWLock*);
extern      void  wunlock(RWLock*);
extern      int         canwlock(RWLock*);
extern      int   (*_rlock)(RWLock*, int, ulong);     /* do not use */
extern      int   (*_wlock)(RWLock*, int, ulong);
extern      void  (*_runlock)(RWLock*, ulong);
extern      void  (*_wunlock)(RWLock*, ulong);

 * per-process private data
extern      void**      privalloc(void);
extern      void  privfree(void**);

 *  network dialing
#define NETPATHLEN 40
extern      int   p9accept(int, char*);
extern      int   p9announce(char*, char*);
extern      int   p9dial(char*, char*, char*, int*);
extern      int   p9dialparse(char *ds, char **net, char **unixa, u32int *ip, int *port);
extern      void  p9setnetmtpt(char*, int, char*);
extern      int   p9listen(char*, char*);
extern      char* p9netmkaddr(char*, char*, char*);
extern      int   p9reject(int, char*, char*);

#define     accept            p9accept
#define     announce    p9announce
#define     dial        p9dial
#define     setnetmtpt  p9setnetmtpt
#define     listen            p9listen
#define     netmkaddr   p9netmkaddr
#define     reject            p9reject

 *  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;
      char *raddr;
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     ODIRECT     128   /* or'ed in, direct access */
#define ONONBLOCK 256   /* or'ed in, non-blocking call */
#define     OEXCL 0x1000      /* or'ed in, exclusive use (create only) */
#define     OLOCK 0x2000      /* or'ed in, lock after opening */
#define     OAPPEND     0x4000      /* or'ed in, append 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 QTLINK          0x04        /* symbolic link */
#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 DMDEVICE        0x00800000  /* mode bit for device files (Unix) */
#define DMSYMLINK 0x00400000  /* mode bit for symbolic links (Unix) */
#define DMNAMEDPIPE     0x00200000  /* mode bit for named pipes (Unix) */
#define DMSOCKET        0x00100000  /* mode bit for sockets (Unix) */

#define DMREAD          0x4         /* mode bit for read permission */
#define DMWRITE         0x2         /* mode bit for write permission */
#define DMEXEC          0x1         /* mode bit for execute permission */

#ifdef RFMEM      /* FreeBSD, OpenBSD */
#undef RFFDG
#undef RFNOTEG
#undef RFPROC
#undef RFMEM
#undef RFCFDG
#undef RFNAMEG
#undef RFENVG
#undef RFCENVG
#undef RFCFDG

      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) */

struct Qid
      uvlong      path;
      ulong vers;
      uchar type;
} Qid;

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 */
struct Waitmsg
      int pid;    /* of loved one */
      ulong time[3];    /* of loved one & descendants */
      char  *msg;
} Waitmsg;

struct IOchunk
      void  *addr;
      ulong len;
} IOchunk;

extern      void  _exits(char*);

extern      void  abort(void);
/* extern   int   access(char*, int); */
extern      long  p9alarm(ulong);
extern      int   await(char*, int);
extern      int   awaitfor(int, char*, int);
extern      int   awaitnohang(char*, int);
/* extern   int   bind(char*, char*, int); give up */
/* extern   int   brk(void*); <unistd.h> */
extern      int   p9chdir(char*);
extern      int   close(int);
extern      int   p9create(char*, int, ulong);
extern      int   p9dup(int, int);
extern      int   errstr(char*, uint);
extern      int   p9exec(char*, char*[]);
extern      int   p9execl(char*, ...);
/* extern   int   p9fork(void); */
extern      int   p9rfork(int);
/* not implemented 
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   noteenable(char*);
extern      int   notedisable(char*);
extern      int   notifyon(char*);
extern      int   notifyoff(char*);
extern      int   p9open(char*, int);
extern      int   fd2path(int, char*, int);
extern      int   p9pipe(int*);
 * use defs from <unistd.h>
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); <unistd.h> */
extern      int   remove(const char*);
/* extern   void* sbrk(ulong); <unistd.h> */
/* extern   long  oseek(int, long, int); */
extern      vlong p9seek(int, vlong, int);
/* give up
extern      long  segattach(int, char*, void*, ulong);
extern      int   segbrk(void*, void*);
extern      int   segdetach(void*);
extern      int   segflush(void*, ulong);
extern      int   segfree(void*, ulong);
extern      int   p9sleep(long);
/* extern   int   stat(char*, uchar*, int); give up */
extern      Waitmsg*    p9wait(void);
extern      Waitmsg*    p9waitfor(int);
extern      Waitmsg*    waitnohang(void);
extern      int   p9waitpid(void);
/* <unistd.h>
extern      long  write(int, void*, long);
extern      long  writev(int, IOchunk*, int);
/* extern   int   wstat(char*, uchar*, int); give up */
extern      ulong rendezvous(ulong, ulong);

#define alarm           p9alarm
#define     dup         p9dup
#define     exec        p9exec
#define     execl p9execl
#define     seek        p9seek
#define sleep           p9sleep
#define wait            p9wait
#define waitpid         p9waitpid
/* #define fork         p9fork */
#define rfork           p9rfork
/* #define access       p9access */
#define create          p9create
#undef open
#define open            p9open
#define pipe            p9pipe
#define     waitfor           p9waitfor

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); <unistd.h> */
/* extern   int   getppid(void); */
extern      void  rerrstr(char*, uint);
extern      char* sysname(void);
extern      void  werrstr(char*, ...);
extern      char* getns(void);
extern      char* get9root(void);
extern      char* unsharp(char*);
extern      int   sendfd(int, int);
extern      int   recvfd(int);
extern      int   post9pservice(int, char*);

/* external names that we don't want to step on */
#define main      p9main

/* compiler directives on plan 9 */
#define     SET(x)      ((x)=0)
#define     USED(x)     if(x){}else{}
#ifdef __GNUC__
#     if __GNUC__ >= 3
#           undef USED
#           define USED(x) { ulong __y __attribute__ ((unused)); __y = (ulong)(x); }
#     endif

#if defined(__OpenBSD__) || (defined(__NetBSD__) && !defined(sched_yield))
#define sched_yield() \
      do { \
            struct timespec ts; \
            ts.tv_sec = 0; \
            ts.tv_nsec = 10; \
            nanosleep(&ts, NULL); \
      } while(0)

/* command line */
extern char *argv0;
extern void __fixargv0(void);
#define     ARGBEGIN    for((argv0?0:(argv0=(__fixargv0(),*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)))\
#define     ARGEND            SET(_argt);USED(_argt);USED(_argc);USED(_args);}USED(argv);USED(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

#if defined(__cplusplus)
#endif      /* _LIB9_H_ */

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