--- a/src/code/exports.lisp
+++ b/src/code/exports.lisp
@@ -394,6 +394,9 @@
 	   "LTCHARS"
 	   "D-NAMLEN"
 
+	   ;; run-program.lisp
+	   "SGTTYB"
+
 	   ;; Other symbols
 	   "BLKCNT-T" "D-INO" "D-OFF" "EADV" "EBADE" "EBADFD" "EBADMSG" "EBADR"
 	   "EBADRQC" "EBADSLT" "EBFONT" "ECHRNG" "ECOMM" "EDEADLOCK" "EDOTDOT"
@@ -402,7 +405,11 @@
 	   "ENOANO" "ENOCSI" "ENODATA" "ENOLCK" "ENOLINK" "ENOMSG" "ENONET" "ENOPKG"
 	   "ENOSR" "ENOSTR" "ENOSYS" "ENOTNAM" "ENOTUNIQ" "EOVERFLOW" "EPROTO"
 	   "EREMCHG" "EREMOTEIO" "ERESTART" "ESRMNT" "ESTALE" "ESTRPIPE" "ETIME"
-	   "EUCLEAN" "EUNATCH" "EXFULL" "O_NOCTTY" "SIGSTKFLT" "TTY-IUCLC"
+	   "EUCLEAN" "EUNATCH" "EXFULL" "O_NOCTTY" "SIGSTKFLT"
+	   "SG-FLAGS"
+	   "TIOCGETP"
+	   "TIOCSETP"
+	   "TTY-IUCLC"
 	   "TTY-OCRNL" "TTY-OFDEL" "TTY-OFILL" "TTY-OLCUC" "TTY-ONLRET" "TTY-ONOCR"
 	   "TTY-XCASE" "UNIX-DUP2" "UNIX-GETITIMER" "UNIX-PID" "UNIX-UNAME"
 	   "UTSNAME"

--- a/src/code/unix.lisp
+++ b/src/code/unix.lisp
@@ -17,6 +17,8 @@
 (intl:textdomain "cmucl-unix")
 
 (pushnew :unix *features*)
+#+linux
+(pushnew :glibc2 *features*)
 
 ;; Check the G_BROKEN_FILENAMES environment variable; if set the encoding
 ;; is locale-dependent...else use :utf-8 on Unicode Lisps.  On 8 bit Lisps
@@ -37,6 +39,8 @@
 
 
 ;;;; Common machine independent structures.
+#+linux
+(defconstant +max-u-long+ 4294967295)
 
 (def-alien-type int64-t (signed 64))
 
@@ -53,6 +57,9 @@
     #+alpha unsigned-int
     #-(or alpha netbsd) unsigned-long)
 
+#+linux
+(def-alien-type ino64-t u-int64-t)
+
 (def-alien-type size-t
     #-(or linux alpha) long
     #+linux unsigned-int 
@@ -488,6 +495,7 @@
 (defconstant l_incr 1 _N"increment the file pointer")
 (defconstant l_xtnd 2 _N"extend the file size")
 
+#-linux
 (defun unix-lseek (fd offset whence)
   _N"Unix-lseek accepts a file descriptor and moves the file pointer ahead
    a certain offset for that file.  Whence can be any of the following:
@@ -501,6 +509,24 @@
 	   (type (integer 0 2) whence))
   (off-t-syscall ("lseek" (int off-t int)) fd offset whence))
 
+#+linux
+(defun unix-lseek (fd offset whence)
+  _N"UNIX-LSEEK accepts a file descriptor and moves the file pointer ahead
+   a certain OFFSET for that file.  WHENCE can be any of the following:
+
+   l_set        Set the file pointer.
+   l_incr       Increment the file pointer.
+   l_xtnd       Extend the file size.
+  "
+  (declare (type unix-fd fd)
+	   (type (signed-byte 64) offset)
+	   (type (integer 0 2) whence))
+  (let ((result (alien-funcall
+                 (extern-alien "lseek64" (function off-t int off-t int))
+                 fd offset whence)))
+    (if (minusp result)
+        (values nil (unix-errno))
+        (values result 0))))
 ;;; Unix-mkdir accepts a name and a mode and attempts to create the
 ;;; corresponding directory with mode mode.
 
@@ -606,7 +632,7 @@
   
   (declare (type unix-pathname name)
 	   (type unix-file-mode mode))
-  (int-syscall (#+solaris "creat64" #-solaris "creat" c-string int)
+  (int-syscall (#+(or linux solaris) "creat64" #-(or linux solaris) "creat" c-string int)
 	       (%name->file name) mode))
 
 ;;; Unix-read accepts a file descriptor, a buffer, and the length to read.
@@ -1015,27 +1041,55 @@
      (defconstant ,name ,(logior (ash (char-code #\t) 8) cmd))))
 
 #+linux
-(defmacro define-ioctl-command (name dev cmd arg &optional (parm-type :void))
-  (declare (ignore arg parm-type))
-  `(eval-when (eval load compile)
-     (defconstant ,name ,(logior (ash (- (char-code dev) #x20) 8) cmd))))
+(progn
+  (defconstant iocparm-mask #x3fff)
+  (defconstant ioc_void #x00000000)
+  (defconstant ioc_out #x40000000)
+  (defconstant ioc_in #x80000000)
+  (defconstant ioc_inout (logior ioc_in ioc_out)))
+
+#+linux
+(defmacro define-ioctl-command (name dev cmd &optional arg parm-type)
+  _N"Define an ioctl command. If the optional ARG and PARM-TYPE are given
+  then ioctl argument size and direction are included as for ioctls defined
+  by _IO, _IOR, _IOW, or _IOWR. If DEV is a character then the ioctl type
+  is the characters code, else DEV may be an integer giving the type."
+  (let* ((type (if (characterp dev)
+		   (char-code dev)
+		   dev))
+	 (code (logior (ash type 8) cmd)))
+    (when arg
+      (setf code `(logior (ash (logand (alien-size ,arg :bytes) ,iocparm-mask)
+			       16)
+			  ,code)))
+    (when parm-type
+      (let ((dir (ecase parm-type
+		   (:void ioc_void)
+		   (:in ioc_in)
+		   (:out ioc_out)
+		   (:inout ioc_inout))))
+	(setf code `(logior ,dir ,code))))
+    `(eval-when (eval load compile)
+       (defconstant ,name ,code))))
 
 )
 
 ;;; TTY ioctl commands.
 
-(define-ioctl-command TIOCGETP #\t #-linux 8 #+linux #x81 (struct sgttyb) :out)
-(define-ioctl-command TIOCSETP #\t #-linux 9 #+linux #x82 (struct sgttyb) :in)
-(define-ioctl-command TIOCFLUSH #\t #-linux 16 #+linux #x89 int :in)
-(define-ioctl-command TIOCSETC #\t #-linux 17 #+linux #x84 (struct tchars) :in)
-(define-ioctl-command TIOCGETC #\t #-linux 18 #+linux #x83 (struct tchars) :out)
-(define-ioctl-command TIOCGWINSZ #\t #-hpux 104 #+hpux 107 (struct winsize)
-  :out)
-(define-ioctl-command TIOCSWINSZ #\t #-hpux 103 #+hpux 106 (struct winsize)
-  :in)
-
-(define-ioctl-command TIOCNOTTY #\t #-linux 113 #+linux #x22 nil :void)
-#-hpux
+#-linux
+(progn
+  (define-ioctl-command TIOCGETP #\t #-linux 8 #+linux #x81 (struct sgttyb) :out)
+  (define-ioctl-command TIOCSETP #\t #-linux 9 #+linux #x82 (struct sgttyb) :in)
+  (define-ioctl-command TIOCFLUSH #\t #-linux 16 #+linux #x89 int :in)
+  (define-ioctl-command TIOCSETC #\t #-linux 17 #+linux #x84 (struct tchars) :in)
+  (define-ioctl-command TIOCGETC #\t #-linux 18 #+linux #x83 (struct tchars) :out)
+  (define-ioctl-command TIOCGWINSZ #\t #-hpux 104 #+hpux 107 (struct winsize)
+    :out)
+  (define-ioctl-command TIOCSWINSZ #\t #-hpux 103 #+hpux 106 (struct winsize)
+    :in)
+
+  (define-ioctl-command TIOCNOTTY #\t #-linux 113 #+linux #x22 nil :void))
+#-(or hpux linux)
 (progn
   (define-ioctl-command TIOCSLTC #\t #-linux 117 #+linux #x84 (struct ltchars) :in)
   (define-ioctl-command TIOCGLTC #\t #-linux 116 #+linux #x85 (struct ltchars) :out)
@@ -1048,9 +1102,19 @@
   (define-ioctl-command TIOCSPGRP #\T 29 int :in)
   (define-ioctl-command TIOCGPGRP #\T 30 int :out)
   (define-ioctl-command TIOCSIGSEND #\t 93 nil))
+#+linux
+(progn
+  (define-ioctl-command TIOCGWINSZ #\T #x13)
+  (define-ioctl-command TIOCSWINSZ #\T #x14)
+  (define-ioctl-command TIOCNOTTY  #\T #x22)
+  (define-ioctl-command TIOCSPGRP  #\T #x10)
+  (define-ioctl-command TIOCGPGRP  #\T #x0F))
 
 ;;; File ioctl commands.
+#-linux
 (define-ioctl-command FIONREAD #\f #-linux 127 #+linux #x1B int :out)
+#+linux
+(define-ioctl-command FIONREAD #\T #x1B)
 
 
 (defun unix-ioctl (fd cmd arg)
@@ -1463,7 +1527,8 @@
   (when (string= name "")
     (setf name "."))
   (with-alien ((buf (struct stat)))
-    (syscall (#-netbsd "stat" #+netbsd "__stat50" c-string (* (struct stat)))
+    (syscall (#+linux "stat64" #+netbsd "__stat50" #-(or linux netbsd) "stat"
+	      c-string (* (struct stat)))
 	     (extract-stat-results buf)
 	     (%name->file name) (addr buf))))
 
@@ -1472,7 +1537,8 @@
    file must be a symbolic link."
   (declare (type unix-pathname name))
   (with-alien ((buf (struct stat)))
-    (syscall (#-netbsd "lstat" #+netbsd "__lstat50" c-string (* (struct stat)))
+    (syscall (#+linux "lstat64" #+netbsd "__lstat50" #-(or linux netbsd) "lstat"
+              c-string (* (struct stat)))
 	     (extract-stat-results buf)
 	     (%name->file name) (addr buf))))
 
@@ -1481,7 +1547,8 @@
    by the file descriptor fd."
   (declare (type unix-fd fd))
   (with-alien ((buf (struct stat)))
-    (syscall (#-netbsd "fstat" #+netbsd "__fstat50" int (* (struct stat)))
+    (syscall (#+linux "fstat64" #+netbsd "__fstat50" #-(or linux netbsd) "fstat" 
+              int (* (struct stat)))
 	     (extract-stat-results buf)
 	     fd (addr buf))))
 )
@@ -2630,6 +2697,37 @@
        :dir (string (cast (slot result 'pw-dir) c-call:c-string))
        :shell (string (cast (slot result 'pw-shell) c-call:c-string))))))
 
+#+linux
+(defun unix-getpwuid (uid)
+  _N"Return a USER-INFO structure for the user identified by UID, or NIL if not found."
+  (declare (type unix-uid uid))
+  (with-alien ((buf (array c-call:char 1024))
+	       (user-info (struct passwd))
+               (result (* (struct passwd))))
+    (let ((returned
+	   (alien-funcall
+	    (extern-alien "getpwuid_r"
+			  (function c-call:int
+                                    c-call:unsigned-int
+                                    (* (struct passwd))
+                                    (* c-call:char)
+                                    c-call:unsigned-int
+                                    (* (* (struct passwd)))))
+	    uid
+	    (addr user-info)
+	    (cast buf (* c-call:char))
+	    1024
+            (addr result))))
+      (when (zerop returned)
+        (make-user-info
+         :name (string (cast (slot result 'pw-name) c-call:c-string))
+         :password (string (cast (slot result 'pw-passwd) c-call:c-string))
+         :uid (slot result 'pw-uid)
+         :gid (slot result 'pw-gid)
+         :gecos (string (cast (slot result 'pw-gecos) c-call:c-string))
+         :dir (string (cast (slot result 'pw-dir) c-call:c-string))
+         :shell (string (cast (slot result 'pw-shell) c-call:c-string)))))))
+
 ;;; Getrusage is not provided in the C library on Solaris 2.4, and is
 ;;; rather slow on later versions so the "times" system call is
 ;;; provided.