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;;; -*- Package: UNIX -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;;
(ext:file-comment
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  "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/unix.lisp,v 1.39 1994/11/06 18:00:36 ram Exp $")
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;;;
;;; **********************************************************************
;;;
;;; This file contains the UNIX low-level support.
;;;
(in-package "UNIX")
(use-package "ALIEN")
(use-package "C-CALL")
(use-package "SYSTEM")
(use-package "EXT")

(export '(
	  daddr-t caddr-t ino-t swblk-t size-t time-t dev-t off-t uid-t gid-t
	  timeval tv-sec tv-usec timezone tz-minuteswest tz-dsttime
	  itimerval it-interval it-value tchars t-intrc t-quitc t-startc
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	  t-stopc t-eofc t-brkc ltchars t-suspc t-dsuspc t-rprntc t-flushc
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	  t-werasc t-lnextc sgttyb sg-ispeed sg-ospeed sg-erase sg-kill
	  sg-flags winsize ws-row ws-col ws-xpixel ws-ypixel
	  direct d-off d-ino d-reclen #-svr4 d-namlen d-name
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	  stat st-dev st-mode st-nlink st-uid st-gid st-rdev st-size
	  st-atime st-mtime st-ctime st-blksize st-blocks
	  s-ifmt s-ifdir s-ifchr s-ifblk s-ifreg s-iflnk s-ifsock
	  s-isuid s-isgid s-isvtx s-iread s-iwrite s-iexec
	  ruseage ru-utime ru-stime ru-maxrss ru-ixrss ru-idrss
	  ru-isrss ru-minflt ru-majflt ru-nswap ru-inblock ru-oublock
	  ru-msgsnd ru-msgrcv ru-nsignals ru-nvcsw ru-nivcsw
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	  rlimit rlim-cur rlim-max sc-onstack sc-mask sc-pc
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	  unix-errno get-unix-error-msg

	  unix-pathname unix-file-mode unix-fd unix-pid unix-uid unix-gid

	  unix-access r_ok w_ok x_ok f_ok unix-chdir unix-chmod setuidexec
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	  setgidexec savetext readown writeown execown readgrp writegrp
	  execgrp readoth writeoth execoth unix-fchmod unix-chown unix-fchown
	  unix-getdtablesize unix-close unix-creat unix-dup unix-dup2
	  unix-fcntl f-dupfd f-getfd f-setfd f-getfl f-setfl f-getown f-setown
	  fndelay fappend fasync fcreat ftrunc fexcl unix-link unix-lseek
	  l_set l_incr l_xtnd unix-mkdir unix-open o_rdonly o_wronly o_rdwr
	  #+svr4 o_ndelay
	  o_append o_creat o_trunc o_excl unix-pipe unix-read unix-readlink
	  unix-rename unix-rmdir unix-fast-select fd-setsize fd-set fd-clr
	  fd-isset fd-zero unix-select unix-sync unix-fsync unix-truncate
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	  unix-ftruncate unix-symlink unix-unlink unix-write unix-ioctl
	  tcsetpgrp tcgetpgrp tty-process-group
	  terminal-speeds tty-raw tty-crmod tty-echo tty-lcase
	  #-(or hpux svr4) tty-cbreak #-(or hpux svr4) tty-tandem
	  #+(or hpux svr4) termios #+(or hpux svr4) c-lflag
	  #+(or hpux svr4) c-iflag #+(or hpux svr4) c-oflag
	  #+(or hpux svr4) tty-icrnl #+(or hpux svr4) tty-ocrnl
	  #+(or hpux svr4) vdsusp #+(or hpux svr4) veof
	  #+(or hpux svr4) vintr #+(or hpux svr4) vquit #+(or hpux svr4) vstart
	  #+(or hpux svr4) vstop #+(or hpux svr4) vsusp
	  #+(or hpux svr4) c-cflag
	  #+(or hpux svr4) c-cc #+(or hpux svr4) tty-icanon
	  #+(or hpux svr4) vmin #+(or hpux svr4) vtime
	  #+(or hpux svr4) tty-ixon
	  #+(or hpux svr4) tcsaflush #+(or hpux svr4)
	  unix-tcgetattr #+(or hpux svr4) unix-tcsetattr
	  TIOCGETP TIOCSETP TIOCFLUSH TIOCSETC TIOCGETC TIOCSLTC
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	  TIOCGLTC TIOCNOTTY TIOCSPGRP TIOCGPGRP TIOCGWINSZ TIOCSWINSZ
	  KBDCGET KBDCSET KBDCRESET KBDCRST KBDCSSTD KBDSGET KBDGCLICK
	  KBDSCLICK FIONREAD #+hpux siocspgrp
	  unix-exit unix-stat unix-lstat unix-fstat
	  unix-getrusage unix-fast-getrusage rusage_self rusage_children
	  unix-gettimeofday
	  #-hpux unix-utimes #-(or svr4 hpux) unix-setreuid
	  #-(or svr4 hpux) unix-setregid
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	  unix-getgid unix-getegid unix-getpgrp unix-setpgrp unix-getuid
	  unix-getpagesize unix-gethostname unix-gethostid unix-fork
	  unix-current-directory unix-isatty unix-ttyname unix-execve
	  unix-socket unix-connect unix-bind unix-listen unix-accept
	  unix-recv unix-send))

(pushnew :unix *features*)


;;;; Common machine independent structures.

;;; From sys/types.h

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(def-alien-type daddr-t #-alpha long #+alpha int)
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(def-alien-type caddr-t (* char))
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(def-alien-type ino-t #-alpha unsigned-long #+alpha unsigned-int)
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(def-alien-type swblk-t long)
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(def-alien-type size-t #-alpha long #+alpha unsigned-long)
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(def-alien-type time-t #-alpha unsigned-long #+alpha unsigned-int)
(def-alien-type dev-t #-(or alpha svr4) short #+alpha int #+svr4 unsigned-long)
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(def-alien-type off-t #-alpha long #+alpha unsigned-long)
(def-alien-type uid-t #-(or alpha svr4) unsigned-short #+alpha unsigned-int
  #+svr4 long)
(def-alien-type gid-t #-(or alpha svr4) unsigned-short #+alpha unsigned-int
  #+svr4 long)
(def-alien-type mode-t #-(or alpha svr4) unsigned-short
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  #+alpha unsigned-int #+svr4 unsigned-long)
(def-alien-type nlink-t #-svr4 unsigned-short #+svr4 unsigned-long)
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(defconstant FD-SETSIZE #-(or hpux alpha) 256 #+hpux 2048 #+alpha 4096)
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(def-alien-type nil
  (struct fd-set
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    (fds-bits (array #-alpha unsigned-long #+alpha int #.(/ fd-setsize 32)))))
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(defmacro fd-set (offset fd-set)
  (let ((word (gensym))
	(bit (gensym)))
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    `(multiple-value-bind (,word ,bit) (floor ,offset 32)
       (setf (deref (slot ,fd-set 'fds-bits) ,word)
	     (logior (truly-the (unsigned-byte 32) (ash 1 ,bit))
		     (deref (slot ,fd-set 'fds-bits) ,word))))))
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(defmacro fd-clr (offset fd-set)
  (let ((word (gensym))
	(bit (gensym)))
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    `(multiple-value-bind (,word ,bit) (floor ,offset 32)
       (setf (deref (slot ,fd-set 'fds-bits) ,word)
	     (logand (deref (slot ,fd-set 'fds-bits) ,word)
		     (32bit-logical-not
		      (truly-the (unsigned-byte 32) (ash 1 ,bit))))))))
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(defmacro fd-isset (offset fd-set)
  (let ((word (gensym))
	(bit (gensym)))
    `(multiple-value-bind (,word ,bit) (floor ,offset 32)
       (logbitp ,bit (deref (slot ,fd-set 'fds-bits) ,word)))))

(defmacro fd-zero (fd-set)
  `(progn
     ,@(loop for index upfrom 0 below (/ fd-setsize 32)
	 collect `(setf (deref (slot ,fd-set 'fds-bits) ,index) 0))))
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;;; From sys/time.h

(def-alien-type nil
  (struct timeval
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    (tv-sec time-t)		; seconds
    (tv-usec time-t)))		; and microseconds
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(def-alien-type nil
  (struct timezone
    (tz-minuteswest int)		; minutes west of Greenwich
    (tz-dsttime				; type of dst correction
     (enum nil :none :usa :aust :wet :met :eet :can))))

(def-alien-type nil
  (struct itimerval
    (it-interval (struct timeval))	; timer interval
    (it-value (struct timeval))))	; current value

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#+svr4
; High-res time.  Actually posix definition under svr4 name.
(def-alien-type nil
  (struct timestruc-t
    (tv-sec time-t)
    (tv-nsec long)))

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;;; From ioctl.h

(def-alien-type nil
  (struct tchars
    (t-intrc char)			; interrupt
    (t-quitc char)			; quit
    (t-startc char)			; start output
    (t-stopc char)			; stop output
    (t-eofc char)			; end-of-file
    (t-brkc char)))			; input delimiter (like nl)

(def-alien-type nil
  (struct ltchars
    (t-suspc char)			; stop process signal
    (t-dsuspc char)			; delayed stop process signal
    (t-rprntc char)			; reprint line
    (t-flushc char)			; flush output (toggles)
    (t-werasc char)			; word erase
    (t-lnextc char)))			; literal next character

(def-alien-type nil
  (struct sgttyb
    (sg-ispeed char)			; input speed.
    (sg-ospeed char)			; output speed
    (sg-erase char)			; erase character
    (sg-kill char)			; kill character
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    (sg-flags #+mach short #-mach int))) ; mode flags
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(def-alien-type nil
  (struct winsize
    (ws-row unsigned-short)		; rows, in characters
    (ws-col unsigned-short)		; columns, in characters
    (ws-xpixel unsigned-short)		; horizontal size, pixels
    (ws-ypixel unsigned-short)))	; veritical size, pixels


;;; From sys/termio.h

#+(or svr4 hpux)
(def-alien-type nil
  (struct termios
    (c-iflag unsigned-int)
    (c-oflag unsigned-int)
    (c-cflag unsigned-int)
    (c-lflag unsigned-int)
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    #+hpux
    (c-reserved unsigned-int)
    (c-cc (array unsigned-char #+hpux 16 #+solaris 19 #+irix 23))))
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;;; From sys/dir.h

(def-alien-type nil
  (struct direct
    #+(and sunos (not svr4)) (d-off long) ; offset of next disk directory entry
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    (d-ino ino-t); inode number of entry
    #+svr4 (d-off long)
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    (d-reclen unsigned-short)		; length of this record
    #-svr4
    (d-namlen unsigned-short)		; length of string in d-name
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    (d-name (array char 256))))		; name must be no longer than this

;;; From sys/stat.h

#-svr4
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(def-alien-type nil
  (struct stat
    (st-dev dev-t)
    (st-ino ino-t)
    (st-mode mode-t)
    (st-nlink nlink-t)
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    (st-uid uid-t)
    (st-gid gid-t)
    (st-rdev dev-t)
    (st-size off-t)
    (st-atime time-t)
    (st-spare1 int)
    (st-mtime time-t)
    (st-spare2 int)
    (st-ctime time-t)
    (st-spare3 int)
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    (st-blksize #-alpha long #+alpha unsigned-int)
    (st-blocks #-alpha long #+alpha int)
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    (st-spare4 (array long 2))))

#+svr4
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(def-alien-type nil
  (struct stat
    (st-dev dev-t)
    (st-pad1 (array long 3))
    (st-ino ino-t)
    (st-mode unsigned-long)
    (st-nlink short)
    (st-uid uid-t)
    (st-gid gid-t)
    (st-rdev dev-t)
    (st-pad2 (array long 2))
    (st-size off-t)
    (st-pad3 long)
    (st-atime (struct timestruc-t))
    (st-mtime (struct timestruc-t))
    (st-ctime (struct timestruc-t))
    (st-blksize long)
    (st-blocks long)
    (st-fstype (array char 16))
    (st-pad4 (array long 8))))

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(defconstant s-ifmt #o0170000)
(defconstant s-ifdir #o0040000)
(defconstant s-ifchr #o0020000)
(defconstant s-ifblk #o0060000)
(defconstant s-ifreg #o0100000)
(defconstant s-iflnk #o0120000)
(defconstant s-ifsock #o0140000)
(defconstant s-isuid #o0004000)
(defconstant s-isgid #o0002000)
(defconstant s-isvtx #o0001000)
(defconstant s-iread #o0000400)
(defconstant s-iwrite #o0000200)
(defconstant s-iexec #o0000100)

;;; From sys/resource.h

(def-alien-type nil
  (struct rusage
    (ru-utime (struct timeval))		; user time used
    (ru-stime (struct timeval))		; system time used.
    (ru-maxrss long)
    (ru-ixrss long)			; integral sharded memory size
    (ru-idrss long)			; integral unsharded data "
    (ru-isrss long)			; integral unsharded stack "
    (ru-minflt long)			; page reclaims
    (ru-majflt long)			; page faults
    (ru-nswap long)			; swaps
    (ru-inblock long)			; block input operations
    (ru-oublock long)			; block output operations
    (ru-msgsnd long)			; messages sent
    (ru-msgrcv long)			; messages received
    (ru-nsignals long)			; signals received
    (ru-nvcsw long)			; voluntary context switches
    (ru-nivcsw long)))			; involuntary "

(def-alien-type nil
  (struct rlimit
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    (rlim-cur #-alpha int #+alpha unsigned-int)	 ; current (soft) limit
    (rlim-max #-alpha int #+alpha unsigned-int))); maximum value for rlim-cur
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;;;; Errno stuff.

(eval-when (compile eval)

(defparameter *compiler-unix-errors* nil)

(defmacro def-unix-error (name number description)
  `(progn
     (eval-when (compile eval)
       (push (cons ,number ,description) *compiler-unix-errors*))
     (defconstant ,name ,number ,description)
     (export ',name)))

(defmacro emit-unix-errors ()
  (let* ((max (apply #'max (mapcar #'car *compiler-unix-errors*)))
	 (array (make-array (1+ max) :initial-element nil)))
    (dolist (error *compiler-unix-errors*)
      (setf (svref array (car error)) (cdr error)))
    `(progn
       (defvar *unix-errors* ',array)
       (proclaim '(simple-vector *unix-errors*)))))

) ;eval-when

;;; 
;;; From <errno.h>
;;; 
(def-unix-error ESUCCESS 0 "Successful")
(def-unix-error EPERM 1 "Not owner")
(def-unix-error ENOENT 2 "No such file or directory")
(def-unix-error ESRCH 3 "No such process")
(def-unix-error EINTR 4 "Interrupted system call")
(def-unix-error EIO 5 "I/O error")
(def-unix-error ENXIO 6 "No such device or address")
(def-unix-error E2BIG 7 "Arg list too long")
(def-unix-error ENOEXEC 8 "Exec format error")
(def-unix-error EBADF 9 "Bad file number")
(def-unix-error ECHILD 10 "No children")
(def-unix-error EAGAIN 11 "No more processes")
(def-unix-error ENOMEM 12 "Not enough core")
(def-unix-error EACCES 13 "Permission denied")
(def-unix-error EFAULT 14 "Bad address")
(def-unix-error ENOTBLK 15 "Block device required")
(def-unix-error EBUSY 16 "Mount device busy")
(def-unix-error EEXIST 17 "File exists")
(def-unix-error EXDEV 18 "Cross-device link")
(def-unix-error ENODEV 19 "No such device")
(def-unix-error ENOTDIR 20 "Not a director")
(def-unix-error EISDIR 21 "Is a directory")
(def-unix-error EINVAL 22 "Invalid argument")
(def-unix-error ENFILE 23 "File table overflow")
(def-unix-error EMFILE 24 "Too many open files")
(def-unix-error ENOTTY 25 "Not a typewriter")
(def-unix-error ETXTBSY 26 "Text file busy")
(def-unix-error EFBIG 27 "File too large")
(def-unix-error ENOSPC 28 "No space left on device")
(def-unix-error ESPIPE 29 "Illegal seek")
(def-unix-error EROFS 30 "Read-only file system")
(def-unix-error EMLINK 31 "Too many links")
(def-unix-error EPIPE 32 "Broken pipe")
;;; 
;;; Math
(def-unix-error EDOM 33 "Argument too large")
(def-unix-error ERANGE 34 "Result too large")
;;; 
#-svr4
(progn
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;;; non-blocking and interrupt i/o
(def-unix-error EWOULDBLOCK 35 "Operation would block")
(def-unix-error EDEADLK 35 "Operation would block") ; Ditto
(def-unix-error EINPROGRESS 36 "Operation now in progress")
(def-unix-error EALREADY 37 "Operation already in progress")
;;;
;;; ipc/network software
(def-unix-error ENOTSOCK 38 "Socket operation on non-socket")
(def-unix-error EDESTADDRREQ 39 "Destination address required")
(def-unix-error EMSGSIZE 40 "Message too long")
(def-unix-error EPROTOTYPE 41 "Protocol wrong type for socket")
(def-unix-error ENOPROTOOPT 42 "Protocol not available")
(def-unix-error EPROTONOSUPPORT 43 "Protocol not supported")
(def-unix-error ESOCKTNOSUPPORT 44 "Socket type not supported")
(def-unix-error EOPNOTSUPP 45 "Operation not supported on socket")
(def-unix-error EPFNOSUPPORT 46 "Protocol family not supported")
(def-unix-error EAFNOSUPPORT 47 "Address family not supported by protocol family")
(def-unix-error EADDRINUSE 48 "Address already in use")
(def-unix-error EADDRNOTAVAIL 49 "Can't assign requested address")
;;;
;;; operational errors
(def-unix-error ENETDOWN 50 "Network is down")
(def-unix-error ENETUNREACH 51 "Network is unreachable")
(def-unix-error ENETRESET 52 "Network dropped connection on reset")
(def-unix-error ECONNABORTED 53 "Software caused connection abort")
(def-unix-error ECONNRESET 54 "Connection reset by peer")
(def-unix-error ENOBUFS 55 "No buffer space available")
(def-unix-error EISCONN 56 "Socket is already connected")
(def-unix-error ENOTCONN 57 "Socket is not connected")
(def-unix-error ESHUTDOWN 58 "Can't send after socket shutdown")
(def-unix-error ETOOMANYREFS 59 "Too many references: can't splice")
(def-unix-error ETIMEDOUT 60 "Connection timed out")
(def-unix-error ECONNREFUSED 61 "Connection refused")
;;; 
(def-unix-error ELOOP 62 "Too many levels of symbolic links")
(def-unix-error ENAMETOOLONG 63 "File name too long")
;;; 
(def-unix-error EHOSTDOWN 64 "Host is down")
(def-unix-error EHOSTUNREACH 65 "No route to host")
(def-unix-error ENOTEMPTY 66 "Directory not empty")
;;; 
;;; quotas & resource 
(def-unix-error EPROCLIM 67 "Too many processes")
(def-unix-error EUSERS 68 "Too many users")
(def-unix-error EDQUOT 69 "Disc quota exceeded")
;;;
;;; CMU RFS
(def-unix-error ELOCAL 126 "namei should continue locally")
(def-unix-error EREMOTE 127 "namei was handled remotely")
;;;
;;; VICE
(def-unix-error EVICEERR 70 "Remote file system error ")
(def-unix-error EVICEOP 71 "syscall was handled by Vice")
;;;
;;; Mach Emulation
(def-unix-error ERESTART 72 "Mach Emulation Error (?)")
)
#+svr4
(progn
(def-unix-error ENOMSG 35 "No message of desired type")
(def-unix-error EIDRM 36 "Identifier removed")
(def-unix-error ECHRNG 37 "Channel number out of range")
(def-unix-error EL2NSYNC 38 "Level 2 not synchronized")
(def-unix-error EL3HLT 39 "Level 3 halted")
(def-unix-error EL3RST 40 "Level 3 reset")
(def-unix-error ELNRNG 41 "Link number out of range")
(def-unix-error EUNATCH 42 "Protocol driver not attached")
(def-unix-error ENOCSI 43 "No CSI structure available")
(def-unix-error EL2HLT 44 "Level 2 halted")
(def-unix-error EDEADLK 45 "Deadlock situation detected/avoided")
(def-unix-error ENOLCK 46 "No record locks available")
(def-unix-error ECANCELED 47 "Error 47")
(def-unix-error ENOTSUP 48 "Error 48")
(def-unix-error EBADE 50 "Bad exchange descriptor")
(def-unix-error EBADR 51 "Bad request descriptor")
(def-unix-error EXFULL 52 "Message tables full")
(def-unix-error ENOANO 53 "Anode table overflow")
(def-unix-error EBADRQC 54 "Bad request code")
(def-unix-error EBADSLT 55 "Invalid slot")
(def-unix-error EDEADLOCK 56 "File locking deadlock")
(def-unix-error EBFONT 57 "Bad font file format")
(def-unix-error ENOSTR 60 "Not a stream device")
(def-unix-error ENODATA 61 "No data available")
(def-unix-error ETIME 62 "Timer expired")
(def-unix-error ENOSR 63 "Out of stream resources")
(def-unix-error ENONET 64 "Machine is not on the network")
(def-unix-error ENOPKG 65 "Package not installed")
(def-unix-error EREMOTE 66 "Object is remote")
(def-unix-error ENOLINK 67 "Link has been severed")
(def-unix-error EADV 68 "Advertise error")
(def-unix-error ESRMNT 69 "Srmount error")
(def-unix-error ECOMM 70 "Communication error on send")
(def-unix-error EPROTO 71 "Protocol error")
(def-unix-error EMULTIHOP 74 "Multihop attempted")
(def-unix-error EBADMSG 77 "Not a data message")
(def-unix-error ENAMETOOLONG 78 "File name too long")
(def-unix-error EOVERFLOW 79 "Value too large for defined data type")
(def-unix-error ENOTUNIQ 80 "Name not unique on network")
(def-unix-error EBADFD 81 "File descriptor in bad state")
(def-unix-error EREMCHG 82 "Remote address changed")
(def-unix-error ELIBACC 83 "Can not access a needed shared library")
(def-unix-error ELIBBAD 84 "Accessing a corrupted shared library")
(def-unix-error ELIBSCN 85 ".lib section in a.out corrupted")
(def-unix-error ELIBMAX 86 "Attempting to link in more shared libraries than system limit")
(def-unix-error ELIBEXEC 87 "Can not exec a shared library directly")
(def-unix-error EILSEQ 88 "Error 88")
(def-unix-error ENOSYS 89 "Operation not applicable")
(def-unix-error ELOOP 90 "Number of symbolic links encountered during path name traversal exceeds MAXSYMLINKS")
(def-unix-error ERESTART 91 "Error 91")
(def-unix-error ESTRPIPE 92 "Error 92")
(def-unix-error ENOTEMPTY 93 "Directory not empty")
(def-unix-error EUSERS 94 "Too many users")
(def-unix-error ENOTSOCK 95 "Socket operation on non-socket")
(def-unix-error EDESTADDRREQ 96 "Destination address required")
(def-unix-error EMSGSIZE 97 "Message too long")
(def-unix-error EPROTOTYPE 98 "Protocol wrong type for socket")
(def-unix-error ENOPROTOOPT 99 "Option not supported by protocol")
(def-unix-error EPROTONOSUPPORT 120 "Protocol not supported")
(def-unix-error ESOCKTNOSUPPORT 121 "Socket type not supported")
(def-unix-error EOPNOTSUPP 122 "Operation not supported on transport endpoint")
(def-unix-error EPFNOSUPPORT 123 "Protocol family not supported")
(def-unix-error EAFNOSUPPORT 124 "Address family not supported by protocol family")
(def-unix-error EADDRINUSE 125 "Address already in use")
(def-unix-error EADDRNOTAVAIL 126 "Cannot assign requested address")
(def-unix-error ENETDOWN 127 "Network is down")
(def-unix-error ENETUNREACH 128 "Network is unreachable")
(def-unix-error ENETRESET 129 "Network dropped connection because of reset")
(def-unix-error ECONNABORTED 130 "Software caused connection abort")
(def-unix-error ECONNRESET 131 "Connection reset by peer")
(def-unix-error ENOBUFS 132 "No buffer space available")
(def-unix-error EISCONN 133 "Transport endpoint is already connected")
(def-unix-error ENOTCONN 134 "Transport endpoint is not connected")
(def-unix-error ESHUTDOWN 143 "Cannot send after socket shutdown")
(def-unix-error ETOOMANYREFS 144 "Too many references: cannot splice")
(def-unix-error ETIMEDOUT 145 "Connection timed out")
(def-unix-error ECONNREFUSED 146 "Connection refused")
(def-unix-error EHOSTDOWN 147 "Host is down")
(def-unix-error EHOSTUNREACH 148 "No route to host")
(def-unix-error EWOULDBLOCK 11 "Resource temporarily unavailable")
(def-unix-error EALREADY 149 "Operation already in progress")
(def-unix-error EINPROGRESS 150 "Operation now in progress")
(def-unix-error ESTALE 151 "Stale NFS file handle")
)
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;;;
;;; And now for something completely different ...
(emit-unix-errors)

(def-alien-variable ("errno" unix-errno) int)

;;; GET-UNIX-ERROR-MSG -- public.
;;; 
(defun get-unix-error-msg (&optional (error-number unix-errno))
  "Returns a string describing the error number which was returned by a
  UNIX system call."
  (declare (type integer error-number))
  (if (array-in-bounds-p *unix-errors* error-number)
      (svref *unix-errors* error-number)
      (format nil "Unknown error [~d]" error-number)))



;;;; Lisp types used by syscalls.

(deftype unix-pathname () 'simple-string)
(deftype unix-fd () `(integer 0 ,most-positive-fixnum))

#+mach
(progn
  (deftype unix-file-mode () '(unsigned-byte 16))
  (deftype unix-pid () '(unsigned-byte 16))
  (deftype unix-uid () '(unsigned-byte 16))
  (deftype unix-gid () '(unsigned-byte 16)))

#-mach
(progn
  (deftype unix-file-mode () '(unsigned-byte 32))
  (deftype unix-pid () '(unsigned-byte 32))
  (deftype unix-uid () '(unsigned-byte 32))
  (deftype unix-gid () '(unsigned-byte 32)))
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;;;; System calls.

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(defmacro syscall ((name &rest arg-types) success-form &rest args)
  `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
				,@args)))
     (if (minusp result)
	 (values nil unix-errno)
	 ,success-form)))

;;; Like syscall, but if it fails, signal an error instead of returing error
;;; codes.  Should only be used for syscalls that will never really get an
;;; error.
;;;
(defmacro syscall* ((name &rest arg-types) success-form &rest args)
  `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types))
				,@args)))
     (if (minusp result)
	 (error "Syscall ~A failed: ~A" ,name (get-unix-error-msg))
	 ,success-form)))

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