contrib/sb-posix/interface.lisp

   1 (cl:in-package :sb-posix-internal)
   2
   3 (define-condition sb-posix:syscall-error (error)
   4   ((errno :initarg :errno :reader sb-posix:syscall-errno))
   5   (:report (lambda (c s)
   6              (let ((errno (sb-posix:syscall-errno c)))
   7                (format s "System call error ~A (~A)"
   8                        errno (sb-int:strerror errno))))))
   9
  10 (defun syscall-error ()
  11   (error 'sb-posix:syscall-error :errno (get-errno)))
  12
  13 (declaim (inline never-fails))
  14 (defun never-fails (&rest args)
  15   (declare (ignore args))
  16   nil)
  17
  18 ;;; filesystem access
  19
  20 (define-call "access" int minusp (pathname filename) (mode int))
  21 (define-call "chdir" int minusp (pathname filename))
  22 (define-call "chmod" int minusp (pathname filename) (mode sb-posix::mode-t))
  23 (define-call "chown" int minusp (pathname filename)
  24              (owner sb-posix::uid-t)  (group sb-posix::gid-t))
  25 (define-call "close" int minusp (fd file-descriptor))
  26 (define-call "creat" int minusp (pathname filename) (mode sb-posix::mode-t))
  27 (define-call "dup" int minusp (oldfd file-descriptor))
  28 (define-call "dup2" int minusp (oldfd file-descriptor) (newfd file-descriptor))
  29 (define-call "fchdir" int minusp (fd file-descriptor))
  30 (define-call "fchmod" int minusp (fd file-descriptor) (mode sb-posix::mode-t))
  31 (define-call "fchown" int minusp (fd file-descriptor)
  32              (owner sb-posix::uid-t)  (group sb-posix::gid-t))
  33 (define-call "fdatasync" int minusp (fd file-descriptor))
  34 (define-call "ftruncate" int minusp (fd file-descriptor) (length sb-posix::off-t))
  35 (define-call "fsync" int minusp (fd file-descriptor))
  36 (define-call "lchown" int minusp (pathname filename)
  37              (owner sb-posix::uid-t)  (group sb-posix::gid-t))
  38 (define-call "link" int minusp (oldpath filename) (newpath filename))
  39 (define-call "lseek" sb-posix::off-t minusp (fd file-descriptor) (offset sb-posix::off-t) (whence int))
  40 (define-call "mkdir" int minusp (pathname filename) (mode sb-posix::mode-t))
  41 (define-call "mkfifo" int minusp (pathname filename) (mode sb-posix::mode-t))
  42 (define-call-internally open-with-mode "open" int minusp (pathname filename) (flags int) (mode sb-posix::mode-t))
  43 (define-call-internally open-without-mode "open" int minusp (pathname filename) (flags int))
  44 (define-entry-point "open" (pathname flags &optional (mode nil mode-supplied))
  45   (if mode-supplied
  46       (open-with-mode pathname flags mode)
  47       (open-without-mode pathname flags)))
  48 ;;(define-call "readlink" int minusp (path filename) (buf (* t)) (len int))
  49 (define-call "rename" int minusp (oldpath filename) (newpath filename))
  50 (define-call "rmdir" int minusp (pathname filename))
  51 (define-call "symlink" int minusp (oldpath filename) (newpath filename))
  52 (define-call "sync" void never-fails)
  53 (define-call "truncate" int minusp (pathname filename) (length sb-posix::off-t))
  54 (define-call "unlink" int minusp (pathname filename))
  55 (define-call-internally ioctl-without-arg "ioctl" int minusp (fd file-descriptor) (cmd int))
  56 (define-call-internally ioctl-with-int-arg "ioctl" int minusp (fd file-descriptor) (cmd int) (arg int))
  57 (define-call-internally ioctl-with-pointer-arg "ioctl" int minusp (fd file-descriptor) (cmd int) (arg alien-pointer-to-anything-or-nil))
  58 (define-entry-point "ioctl" (fd cmd &optional (arg nil arg-supplied))
  59   (if arg-supplied
  60     (etypecase arg
  61       ((alien int) (ioctl-with-int-arg fd cmd arg))
  62       ((or (alien (* t)) null) (ioctl-with-pointer-arg fd cmd arg)))
  63     (ioctl-without-arg fd cmd)))
  64
  65 (define-call "opendir" (* t) null-alien (pathname filename))
  66 (define-call "readdir" (* t)
  67   ;; readdir() has the worst error convention in the world.  It's just
  68   ;; too painful to support.  (return is NULL _and_ errno "unchanged"
  69   ;; is not an error, it's EOF).
  70   not
  71   (dir (* t)))
  72 (define-call "closedir" int minusp (dir (* t)))
  73
  74 (define-call "umask" sb-posix::mode-t never-fails (mode sb-posix::mode-t))
  75
  76 ;;; uid, gid
  77
  78 (define-call "geteuid" sb-posix::uid-t never-fails) ; "always successful", it says
  79 (define-call "getresuid" sb-posix::uid-t never-fails)
  80 (define-call "getuid" sb-posix::uid-t never-fails)
  81 (define-call "seteuid" int minusp (uid sb-posix::uid-t))
  82 (define-call "setfsuid" int minusp (uid sb-posix::uid-t))
  83 (define-call "setreuid" int minusp
  84              (ruid sb-posix::uid-t) (euid sb-posix::uid-t))
  85 (define-call "setresuid" int minusp
  86              (ruid sb-posix::uid-t) (euid sb-posix::uid-t)
  87              (suid sb-posix::uid-t))
  88 (define-call "setuid" int minusp (uid sb-posix::uid-t))
  89
  90 (define-call "getegid" sb-posix::gid-t never-fails)
  91 (define-call "getgid" sb-posix::gid-t never-fails)
  92 (define-call "getresgid" sb-posix::gid-t never-fails)
  93 (define-call "setegid" int minusp (gid sb-posix::gid-t))
  94 (define-call "setfsgid" int minusp (gid sb-posix::gid-t))
  95 (define-call "setgid" int minusp (gid sb-posix::gid-t))
  96 (define-call "setregid" int minusp
  97              (rgid sb-posix::gid-t) (egid sb-posix::gid-t))
  98 (define-call "setresgid" int minusp
  99              (rgid sb-posix::gid-t)
 100              (egid sb-posix::gid-t) (sgid sb-posix::gid-t))
 101
 102 ;;; processes, signals
 103 (define-call "alarm" int never-fails (seconds unsigned))
 104 (define-call "getpgid" sb-posix::pid-t minusp (pid sb-posix::pid-t))
 105 (define-call "getpid" sb-posix::pid-t never-fails)
 106 (define-call "getppid" sb-posix::pid-t never-fails)
 107 (define-call "getpgrp" sb-posix::pid-t never-fails)
 108 (define-call "getsid" sb-posix::pid-t minusp  (pid sb-posix::pid-t))
 109 (define-call "kill" int minusp (pid sb-posix::pid-t) (signal int))
 110 (define-call "killpg" int minusp (pgrp int) (signal int))
 111 (define-call "pause" int minusp)
 112 (define-call "setpgid" int minusp
 113              (pid sb-posix::pid-t) (pgid sb-posix::pid-t))
 114 (define-call "setpgrp" int minusp)
 115
 116 ;;; mmap, msync
 117 (define-call "mmap" sb-sys:system-area-pointer
 118   ;; KLUDGE: #XFFFFFFFF is (void *)-1, which is the charming return
 119   ;; value of mmap on failure.  Except on 64 bit systems ...
 120   (lambda (res)
 121     (= (sb-sys:sap-int res) #-alpha #XFFFFFFFF #+alpha #xffffffffffffffff))
 122   (addr sap-or-nil) (length unsigned) (prot unsigned)
 123   (flags unsigned) (fd file-descriptor) (offset sb-posix::off-t))
 124
 125 (define-call "munmap" int minusp
 126   (start sb-sys:system-area-pointer) (length unsigned))
 127
 128 (define-call "msync" int minusp
 129   (addr sb-sys:system-area-pointer) (length unsigned) (flags int))
 130
 131 (define-call "getpagesize" int minusp)
 132
 133 (defmacro define-stat-call (name arg designator-fun type)
 134   ;; FIXME: this isn't the documented way of doing this, surely?
 135   (let ((lisp-name (intern (string-upcase name) :sb-posix)))
 136     `(progn
 137       (export ',lisp-name :sb-posix)
 138       (declaim (inline ,lisp-name))
 139       (defun ,lisp-name (,arg &optional stat)
 140         (declare (type (or null sb-posix::stat) stat))
 141         (unless stat
 142           (setq stat (sb-posix::allocate-stat)))
 143         ;; FIXME: Hmm.  WITH-PINNED-OBJECTS/WITHOUT-GCING or something
 144         ;; is probably needed round here.
 145         (let* ((s (sb-sys:int-sap
 146                    ;; FIXME: WILL NOT WORK ON 64-BIT LISP.  VECTOR-SAP
 147                    ;; would be better if the STAT object were
 148                    ;; guaranteed to be a vector, but it's not (and may
 149                    ;; well turn into an alien soon).
 150                    (+ 8 (logandc2 (sb-kernel:get-lisp-obj-address stat) 7))))
 151                (r (alien-funcall
 152                    (extern-alien ,name ,type)
 153                    (,designator-fun ,arg)
 154                    s)))
 155           (when (minusp r)
 156             (syscall-error)))
 157         stat))))
 158 (define-stat-call "stat" pathname sb-posix::filename
 159                   ;; FIXME: (* T)?  Ew.  (* STAT) would be preferable
 160                   (function int c-string (* t)))
 161 (define-stat-call "lstat" pathname sb-posix::filename
 162                   (function int c-string (* t)))
 163 (define-stat-call "fstat" fd sb-posix::file-descriptor
 164                   (function int int (* t)))
 165
 166
 167 ;;; mode flags
 168 (define-call "s_isreg" boolean never-fails (mode sb-posix::mode-t))
 169 (define-call "s_isdir" boolean never-fails (mode sb-posix::mode-t))
 170 (define-call "s_ischr" boolean never-fails (mode sb-posix::mode-t))
 171 (define-call "s_isblk" boolean never-fails (mode sb-posix::mode-t))
 172 (define-call "s_isfifo" boolean never-fails (mode sb-posix::mode-t))
 173 (define-call "s_islnk" boolean never-fails (mode sb-posix::mode-t))
 174 (define-call "s_issock" boolean never-fails (mode sb-posix::mode-t))
 175
 176 (export 'sb-posix::pipe :sb-posix)
 177 (declaim (inline sb-posix::pipe))
 178 (defun sb-posix::pipe (&optional filedes2)
 179   (declare (type (or null (simple-array (signed-byte 32) (2))) filedes2))
 180   (unless filedes2
 181     (setq filedes2 (make-array 2 :element-type '(signed-byte 32))))
 182   (let ((r (alien-funcall
 183             ;; FIXME: (* INT)?  (ARRAY INT 2) would be better
 184             (extern-alien "pipe" (function int (* int)))
 185             (sb-sys:vector-sap filedes2))))
 186     (when (minusp r)
 187       (syscall-error)))
 188   (values (aref filedes2 0) (aref filedes2 1)))