X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Funix.lisp;h=dd04eb0fc73fa7fa2277a63c62bab6bd02749f1e;hb=020de3c04699323437f0c746fe986506b716ab97;hp=b6e0b00b07c595852d4acf418af5cc1738ba53bb;hpb=83fd554b67913275d8dc06edcad8b2f065c89c49;p=sbcl.git diff --git a/src/code/unix.lisp b/src/code/unix.lisp index b6e0b00..dd04eb0 100644 --- a/src/code/unix.lisp +++ b/src/code/unix.lisp @@ -47,7 +47,7 @@ ;;;; Lisp types used by syscalls -(deftype unix-pathname () 'simple-string) +(deftype unix-pathname () 'simple-base-string) (deftype unix-fd () `(integer 0 ,most-positive-fixnum)) (deftype unix-file-mode () '(unsigned-byte 32)) @@ -68,7 +68,7 @@ ,@args))) (if (minusp result) (values nil (get-errno)) - ,success-form))) + ,success-form))) ;;; This is like SYSCALL, but if it fails, signal an error instead of ;;; returning error codes. Should only be used for syscalls that will @@ -90,9 +90,9 @@ ;;;; hacking the Unix environment -(def-alien-routine ("getenv" posix-getenv) c-string - "Return the environment string \"name=value\" which corresponds to NAME, or - NIL if there is none." +(define-alien-routine ("getenv" posix-getenv) c-string + "Return the \"value\" part of the environment string \"name=value\" which + corresponds to NAME, or NIL if there is none." (name c-string)) ;;; from stdio.h @@ -112,12 +112,12 @@ ;;; is not extreme enough, since it doesn't need to be blindingly ;;; fast: we can just implement those functions in C as a wrapper ;;; layer. -(def-alien-type fd-mask unsigned-long) +(define-alien-type fd-mask unsigned-long) (eval-when (:compile-toplevel :load-toplevel :execute) (defconstant fd-setsize 1024)) -(def-alien-type nil +(define-alien-type nil (struct fd-set (fds-bits (array fd-mask #.(/ fd-setsize 32))))) @@ -152,7 +152,7 @@ ;; A time value that is accurate to the nearest ;; microsecond but also has a range of years. -(def-alien-type nil +(define-alien-type nil (struct timeval (tv-sec time-t) ; seconds (tv-usec time-t))) ; and microseconds @@ -163,7 +163,7 @@ (defconstant rusage_children -1) ; terminated child processes (defconstant rusage_both -2) -(def-alien-type nil +(define-alien-type nil (struct rusage (ru-utime (struct timeval)) ; user time used (ru-stime (struct timeval)) ; system time used. @@ -204,22 +204,26 @@ (defconstant l_incr 1) ; to increment the file pointer (defconstant l_xtnd 2) ; to extend the file size -;;; Accept a file descriptor and move 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. +;;; Is a stream interactive? +(defun unix-isatty (fd) + (declare (type unix-fd fd)) + (int-syscall ("isatty" int) fd)) + (defun unix-lseek (fd offset whence) + "Unix-lseek accepts a file descriptor and moves the file pointer by + OFFSET octets. 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 (unsigned-byte 32) offset) (type (integer 0 2) whence)) - #!-(and x86 bsd) - (int-syscall ("lseek" int off-t int) fd offset whence) - ;; Need a 64-bit return value type for this. TBD. For now, - ;; don't use this with any 2G+ partitions. - #!+(and x86 bsd) - (int-syscall ("lseek" int unsigned-long unsigned-long int) - fd offset 0 whence)) + (let ((result (alien-funcall (extern-alien "lseek" (function off-t int off-t int)) + fd offset whence))) + (if (minusp result ) + (values nil (get-errno)) + (values result 0)))) ;;; UNIX-READ accepts a file descriptor, a buffer, and the length to read. ;;; It attempts to read len bytes from the device associated with fd @@ -264,6 +268,16 @@ (type unix-file-mode mode)) (void-syscall ("mkdir" c-string int) name mode)) +;;; Given a C char* pointer allocated by malloc(), free it and return a +;;; corresponding Lisp string (or return NIL if the pointer is a C NULL). +(defun newcharstar-string (newcharstar) + (declare (type (alien (* char)) newcharstar)) + (if (null-alien newcharstar) + nil + (prog1 + (cast newcharstar c-string) + (free-alien newcharstar)))) + ;;; Return the Unix current directory as a SIMPLE-STRING, in the ;;; style returned by getcwd() (no trailing slash character). (defun posix-getcwd () @@ -271,16 +285,24 @@ ;; behavior, automatically allocating memory when a null buffer ;; pointer is used. On a system which doesn't support that ;; extension, it'll have to be rewritten somehow. - #!-(or linux openbsd freebsd) (,stub,) - (let* ((raw-char-ptr (alien-funcall (extern-alien "getcwd" - (function (* char) - (* char) size-t)) - nil 0))) - (if (null-alien raw-char-ptr) - (simple-perror "getcwd") - (prog1 - (cast raw-char-ptr c-string) - (free-alien raw-char-ptr))))) + ;; + ;; SunOS and OSF/1 provide almost as useful an extension: if given a null + ;; buffer pointer, it will automatically allocate size space. The + ;; KLUDGE in this solution arises because we have just read off + ;; PATH_MAX+1 from the Solaris header files and stuck it in here as + ;; a constant. Going the grovel_headers route doesn't seem to be + ;; helpful, either, as Solaris doesn't export PATH_MAX from + ;; unistd.h. + #!-(or linux openbsd freebsd sunos osf1 darwin) (,stub,) + #!+(or linux openbsd freebsd sunos osf1 darwin) + (or (newcharstar-string (alien-funcall (extern-alien "getcwd" + (function (* char) + (* char) + size-t)) + nil + #!+(or linux openbsd freebsd darwin) 0 + #!+(or sunos osf1) 1025)) + (simple-perror "getcwd"))) ;;; Return the Unix current directory as a SIMPLE-STRING terminated ;;; by a slash character. @@ -318,10 +340,25 @@ (void-syscall ("exit" int) code)) ;;; Return the process id of the current process. -(def-alien-routine ("getpid" unix-getpid) int) - -;;; Return the real user-id associated with the current process. -(def-alien-routine ("getuid" unix-getuid) int) +(define-alien-routine ("getpid" unix-getpid) int) + +;;; Return the real user id associated with the current process. +(define-alien-routine ("getuid" unix-getuid) int) + +;;; Translate a user id into a login name. +(defun uid-username (uid) + (or (newcharstar-string (alien-funcall (extern-alien "uid_username" + (function (* char) int)) + uid)) + (error "found no match for Unix uid=~S" uid))) + +;;; Return the namestring of the home directory, being careful to +;;; include a trailing #\/ +(defun uid-homedir (uid) + (or (newcharstar-string (alien-funcall (extern-alien "uid_homedir" + (function (* char) int)) + uid)) + (error "failed to resolve home directory for Unix uid=~S" uid))) ;;; Invoke readlink(2) on the file name specified by PATH. Return ;;; (VALUES LINKSTRING NIL) on success, or (VALUES NIL ERRNO) on @@ -346,26 +383,6 @@ (declare (type unix-pathname name)) (void-syscall ("unlink" c-string) name)) -;;; Set the tty-process-group for the unix file-descriptor FD to PGRP. -;;; If not supplied, FD defaults to "/dev/tty". -(defun %set-tty-process-group (pgrp &optional fd) - (let ((old-sigs (unix-sigblock (sigmask :sigttou - :sigttin - :sigtstp - :sigchld)))) - (declare (type (unsigned-byte 32) old-sigs)) - (unwind-protect - (if fd - (tcsetpgrp fd pgrp) - (multiple-value-bind (tty-fd errno) (unix-open "/dev/tty" o_rdwr 0) - (cond (tty-fd - (multiple-value-prog1 - (tcsetpgrp tty-fd pgrp) - (unix-close tty-fd))) - (t - (values nil errno))))) - (unix-sigsetmask old-sigs)))) - ;;; Return the name of the host machine as a string. (defun unix-gethostname () (with-alien ((buf (array char 256))) @@ -378,6 +395,10 @@ (declare (type unix-fd fd)) (void-syscall ("fsync" int) fd)) + +(defun unix-setsid () + (int-syscall ("setsid"))) + ;;;; sys/ioctl.h ;;; UNIX-IOCTL performs a variety of operations on open i/o @@ -385,15 +406,16 @@ ;;; information. (defun unix-ioctl (fd cmd arg) (declare (type unix-fd fd) - (type (unsigned-byte 32) cmd)) - (void-syscall ("ioctl" int unsigned-int (* char)) fd cmd arg)) + (type (signed-byte 32) cmd)) + (void-syscall ("ioctl" int int (* char)) fd cmd arg)) ;;;; sys/resource.h ;;; FIXME: All we seem to need is the RUSAGE_SELF version of this. ;;; -;;; Like getrusage(2), but return only the system and user time, -;;; and return the seconds and microseconds as separate values. +;;; This is like getrusage(2), except it returns only the system and +;;; user time, and returns the seconds and microseconds as separate +;;; values. #!-sb-fluid (declaim (inline unix-fast-getrusage)) (defun unix-fast-getrusage (who) (declare (values (member t) @@ -439,30 +461,29 @@ ;;;; sys/select.h -(defmacro unix-fast-select (num-descriptors - read-fds write-fds exception-fds - timeout-secs &optional (timeout-usecs 0)) - #!+sb-doc - "Perform the UNIX select(2) system call." - (declare (type (integer 0 #.FD-SETSIZE) num-descriptors) +;;;; FIXME: Why have both UNIX-SELECT and UNIX-FAST-SELECT? + +;;; Perform the UNIX select(2) system call. +(declaim (inline unix-fast-select)) ; (used to be a macro in CMU CL) +(defun unix-fast-select (num-descriptors + read-fds write-fds exception-fds + timeout-secs &optional (timeout-usecs 0)) + (declare (type (integer 0 #.fd-setsize) num-descriptors) (type (or (alien (* (struct fd-set))) null) read-fds write-fds exception-fds) (type (or null (unsigned-byte 31)) timeout-secs) - (type (unsigned-byte 31) timeout-usecs) ) + (type (unsigned-byte 31) timeout-usecs)) ;; FIXME: CMU CL had - ;; (optimize (speed 3) (safety 0) (inhibit-warnings 3)) - ;; in the declarations above. If they're important, they should - ;; be in a declaration inside the LET expansion, not in the - ;; macro compile-time code. - `(let ((timeout-secs ,timeout-secs)) - (with-alien ((tv (struct timeval))) - (when timeout-secs - (setf (slot tv 'tv-sec) timeout-secs) - (setf (slot tv 'tv-usec) ,timeout-usecs)) - (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set)) - (* (struct fd-set)) (* (struct timeval))) - ,num-descriptors ,read-fds ,write-fds ,exception-fds - (if timeout-secs (alien-sap (addr tv)) (int-sap 0)))))) + ;; (declare (optimize (speed 3) (safety 0) (inhibit-warnings 3))) + ;; here. Is that important for SBCL? If so, why? Profiling might tell us.. + (with-alien ((tv (struct timeval))) + (when timeout-secs + (setf (slot tv 'tv-sec) timeout-secs) + (setf (slot tv 'tv-usec) timeout-usecs)) + (int-syscall ("select" int (* (struct fd-set)) (* (struct fd-set)) + (* (struct fd-set)) (* (struct timeval))) + num-descriptors read-fds write-fds exception-fds + (if timeout-secs (alien-sap (addr tv)) (int-sap 0))))) ;;; UNIX-SELECT accepts sets of file descriptors and waits for an event ;;; to happen on one of them or to time out. @@ -533,16 +554,16 @@ ;;; st_size is a long, not an off-t, because off-t is a 64-bit ;;; quantity on Alpha. And FIXME: "No one would want a file length ;;; longer than 32 bits anyway, right?":-| -(def-alien-type nil +(define-alien-type nil (struct wrapped_stat - (st-dev unsigned-long) ; would be dev-t in a real stat + (st-dev unsigned-int) ; would be dev-t in a real stat (st-ino ino-t) (st-mode mode-t) (st-nlink nlink-t) (st-uid uid-t) (st-gid gid-t) - (st-rdev unsigned-long) ; would be dev-t in a real stat - (st-size unsigned-long) ; would be off-t in a real stat + (st-rdev unsigned-int) ; would be dev-t in a real stat + (st-size unsigned-int) ; would be off-t in a real stat (st-blksize unsigned-long) (st-blocks unsigned-long) (st-atime time-t) @@ -608,13 +629,13 @@ ;; the POSIX.4 structure for a time value. This is like a "struct ;; timeval" but has nanoseconds instead of microseconds. -(def-alien-type nil +(define-alien-type nil (struct timespec (tv-sec long) ; seconds (tv-nsec long))) ; nanoseconds ;; used by other time functions -(def-alien-type nil +(define-alien-type nil (struct tm (tm-sec int) ; Seconds. [0-60] (1 leap second) (tm-min int) ; Minutes. [0-59] @@ -628,27 +649,21 @@ (tm-gmtoff long) ; Seconds east of UTC. (tm-zone c-string))) ; Timezone abbreviation. -(def-alien-routine get-timezone sb!c-call:void - (when sb!c-call:long :in) - (minutes-west sb!c-call:int :out) +(define-alien-routine get-timezone sb!alien:void + (when sb!alien:long :in) + (seconds-west sb!alien:int :out) (daylight-savings-p sb!alien:boolean :out)) -(defun unix-get-minutes-west (secs) - (multiple-value-bind (ignore minutes dst) (get-timezone secs) +(defun unix-get-seconds-west (secs) + (multiple-value-bind (ignore seconds dst) (get-timezone secs) (declare (ignore ignore) (ignore dst)) - (values minutes))) - -(defun unix-get-timezone (secs) - (multiple-value-bind (ignore minutes dst) (get-timezone secs) - (declare (ignore ignore) (ignore minutes)) - (values (deref unix-tzname (if dst 1 0))))) - + (values seconds))) ;;;; sys/time.h ;;; Structure crudely representing a timezone. KLUDGE: This is ;;; obsolete and should never be used. -(def-alien-type nil +(define-alien-type nil (struct timezone (tz-minuteswest int) ; minutes west of Greenwich (tz-dsttime int))) ; type of dst correction @@ -672,12 +687,95 @@ (addr tz)))) -(defconstant ENOENT 2) ; Unix error code, "No such file or directory" -(defconstant EINTR 4) ; Unix error code, "Interrupted system call" -(defconstant EIO 5) ; Unix error code, "I/O error" -(defconstant EEXIST 17) ; Unix error code, "File exists" -(defconstant ESPIPE 29) ; Unix error code, "Illegal seek" -(defconstant EWOULDBLOCK 11) ; Unix error code, "Operation would block" +;; Type of the second argument to `getitimer' and +;; the second and third arguments `setitimer'. +(define-alien-type nil + (struct itimerval + (it-interval (struct timeval)) ; timer interval + (it-value (struct timeval)))) ; current value + +(defconstant ITIMER-REAL 0) +(defconstant ITIMER-VIRTUAL 1) +(defconstant ITIMER-PROF 2) + +(defun unix-getitimer(which) + "Unix-getitimer returns the INTERVAL and VALUE slots of one of + three system timers (:real :virtual or :profile). On success, + unix-getitimer returns 5 values, + T, it-interval-secs, it-interval-usec, it-value-secs, it-value-usec." + (declare (type (member :real :virtual :profile) which) + (values t + (unsigned-byte 29) (mod 1000000) + (unsigned-byte 29) (mod 1000000))) + (let ((which (ecase which + (:real ITIMER-REAL) + (:virtual ITIMER-VIRTUAL) + (:profile ITIMER-PROF)))) + (with-alien ((itv (struct itimerval))) + (syscall* ("getitimer" int (* (struct itimerval))) + (values T + (slot (slot itv 'it-interval) 'tv-sec) + (slot (slot itv 'it-interval) 'tv-usec) + (slot (slot itv 'it-value) 'tv-sec) + (slot (slot itv 'it-value) 'tv-usec)) + which (alien-sap (addr itv)))))) + +(defun unix-setitimer (which int-secs int-usec val-secs val-usec) + " Unix-setitimer sets the INTERVAL and VALUE slots of one of + three system timers (:real :virtual or :profile). A SIGALRM signal + will be delivered VALUE from now. INTERVAL, + when non-zero, is to be loaded each time + the timer expires. Setting INTERVAL and VALUE to zero disables + the timer. See the Unix man page for more details. On success, + unix-setitimer returns the old contents of the INTERVAL and VALUE + slots as in unix-getitimer." + (declare (type (member :real :virtual :profile) which) + (type (unsigned-byte 29) int-secs val-secs) + (type (integer 0 (1000000)) int-usec val-usec) + (values t + (unsigned-byte 29) (mod 1000000) + (unsigned-byte 29) (mod 1000000))) + (let ((which (ecase which + (:real ITIMER-REAL) + (:virtual ITIMER-VIRTUAL) + (:profile ITIMER-PROF)))) + (with-alien ((itvn (struct itimerval)) + (itvo (struct itimerval))) + (setf (slot (slot itvn 'it-interval) 'tv-sec ) int-secs + (slot (slot itvn 'it-interval) 'tv-usec) int-usec + (slot (slot itvn 'it-value ) 'tv-sec ) val-secs + (slot (slot itvn 'it-value ) 'tv-usec) val-usec) + (syscall* ("setitimer" int (* (struct timeval))(* (struct timeval))) + (values T + (slot (slot itvo 'it-interval) 'tv-sec) + (slot (slot itvo 'it-interval) 'tv-usec) + (slot (slot itvo 'it-value) 'tv-sec) + (slot (slot itvo 'it-value) 'tv-usec)) + which (alien-sap (addr itvn))(alien-sap (addr itvo)))))) + +(defmacro sb!ext:with-timeout (expires &body body) + "Execute the body, interrupting it with a SIGALRM after at least +EXPIRES seconds have passed. Uses Unix setitimer(), restoring any +previous timer after the body has finished executing" + (with-unique-names (saved-seconds saved-useconds s u) + `(let (- ,saved-seconds ,saved-useconds) + (multiple-value-setq (- - - ,saved-seconds ,saved-useconds) + (unix-getitimer :real)) + (multiple-value-bind (,s ,u) (floor ,expires) + (setf ,u (floor (* ,u 1000000))) + (if (and (> ,expires 0) + (or (and (zerop ,saved-seconds) (zerop ,saved-useconds)) + (> ,saved-seconds ,s) + (and (= ,saved-seconds ,s) + (> ,saved-useconds ,u)))) + (unwind-protect + (progn + (unix-setitimer :real 0 0 ,s ,u) + ,@body) + (unix-setitimer :real 0 0 ,saved-seconds ,saved-useconds)) + (progn + ,@body)))))) + ;;; FIXME: Many Unix error code definitions were deleted from the old ;;; CMU CL source code here, but not in the exports of SB-UNIX. I ;;; (WHN) hope that someday I'll figure out an automatic way to detect @@ -685,13 +783,12 @@ ;;; enough of them all in one place here that they should probably be ;;; removed by hand. - ;;;; support routines for dealing with Unix pathnames (defun unix-file-kind (name &optional check-for-links) #!+sb-doc "Return either :FILE, :DIRECTORY, :LINK, :SPECIAL, or NIL." - (declare (simple-string name)) + (declare (simple-base-string name)) (multiple-value-bind (res dev ino mode) (if check-for-links (unix-lstat name) (unix-stat name)) (declare (type (or fixnum null) mode) @@ -718,11 +815,11 @@ (defun unix-resolve-links (pathname) (declare (type simple-string pathname)) (aver (not (relative-unix-pathname? pathname))) - (/show "entering UNIX-RESOLVE-LINKS") + (/noshow "entering UNIX-RESOLVE-LINKS") (loop with previous-pathnames = nil do - (/show pathname previous-pathnames) + (/noshow pathname previous-pathnames) (let ((link (unix-readlink pathname))) - (/show link) + (/noshow link) ;; Unlike the old CMU CL code, we handle a broken symlink by ;; returning the link itself. That way, CL:TRUENAME on a ;; broken link returns the link itself, so that CL:DIRECTORY @@ -741,7 +838,7 @@ pathname :from-end t))) (dir (subseq pathname 0 dir-len))) - (/show dir) + (/noshow dir) (concatenate 'string dir link)) link)))) (if (unix-file-kind new-pathname) @@ -842,6 +939,17 @@ (t (subseq dst 0 dst-len))))) +;;;; A magic constant for wait3(). +;;;; +;;;; FIXME: This used to be defined in run-program.lisp as +;;;; (defconstant wait-wstopped #-svr4 #o177 #+svr4 wait-wuntraced) +;;;; According to some of the man pages, the #o177 is part of the API +;;;; for wait3(); that said, under SunOS there is a WSTOPPED thing in +;;;; the headers that may or may not be the same thing. To be +;;;; investigated. -- CSR, 2002-03-25 +(defconstant wstopped #o177) + + ;;;; stuff not yet found in the header files ;;;; ;;;; Abandon all hope who enters here...