X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Funix.lisp;h=b011c9e6632db48b2d4ab23b8d05379bd42a30b9;hb=988afd9d54ba6c8a915544822658824ab6ae0d6c;hp=424b2b8b1354621c28aff33fbcdbec8ec6c7d9a0;hpb=d7f6139a91d7d9b0667a597584ae306d958bb2f4;p=sbcl.git diff --git a/src/code/unix.lisp b/src/code/unix.lisp index 424b2b8..b011c9e 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)) @@ -64,21 +64,25 @@ ;;; implemented using SB!XC:DEFMACRO wrapped in EVAL-WHEN. (defmacro syscall ((name &rest arg-types) success-form &rest args) - `(let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) + `(locally + (declare (optimize (sb!c::float-accuracy 0))) + (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) ,@args))) - (if (minusp result) - (values nil (get-errno)) - ,success-form))) + (if (minusp result) + (values nil (get-errno)) + ,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 ;;; 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 (strerror)) - ,success-form))) + `(locally + (declare (optimize (sb!c::float-accuracy 0))) + (let ((result (alien-funcall (extern-alien ,name (function int ,@arg-types)) + ,@args))) + (if (minusp result) + (error "Syscall ~A failed: ~A" ,name (strerror)) + ,success-form)))) (/show0 "unix.lisp 109") @@ -90,9 +94,9 @@ ;;;; 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 @@ -107,29 +111,17 @@ (/show0 "unix.lisp 220") -;;; FIXME: Isn't there some way to use a C wrapper to avoid this hand-copying? -(defconstant +max-s-long+ 2147483647) -(defconstant +max-u-long+ 4294967295) -(def-alien-type quad-t #+nil long-long #-nil (array long 2)) -(def-alien-type uquad-t #+nil unsigned-long-long - #-nil (array unsigned-long 2)) -(def-alien-type qaddr-t (* quad-t)) -(def-alien-type daddr-t int) -(def-alien-type caddr-t (* char)) -(def-alien-type swblk-t long) -(def-alien-type size-t unsigned-int) -(def-alien-type ssize-t int) - -;;; FIXME: We shouldn't hand-copy types from header files into Lisp like this -;;; unless we have extreme provocation. Reading directories 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) +;;; FIXME: We shouldn't hand-copy types from header files into Lisp +;;; like this unless we have extreme provocation. Reading directories +;;; 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. +(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))))) @@ -164,7 +156,7 @@ ;; 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 @@ -175,7 +167,7 @@ (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. @@ -216,22 +208,26 @@ (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 @@ -245,7 +241,7 @@ ;;; UNIX-WRITE accepts a file descriptor, a buffer, an offset, and the ;;; length to write. It attempts to write len bytes to the device -;;; associated with fd from the the buffer starting at offset. It returns +;;; associated with fd from the buffer starting at offset. It returns ;;; the actual number of bytes written. (defun unix-write (fd buf offset len) (declare (type unix-fd fd) @@ -271,29 +267,67 @@ (values (deref fds 0) (deref fds 1)) (cast fds (* int))))) -;;; UNIX-CHDIR accepts a directory name and makes that the -;;; current working directory. -(defun unix-chdir (path) - (declare (type unix-pathname path)) - (void-syscall ("chdir" c-string) path)) - (defun unix-mkdir (name mode) (declare (type unix-pathname name) (type unix-file-mode mode)) (void-syscall ("mkdir" c-string int) name mode)) -;;; Return the current directory as a SIMPLE-STRING. -(defun unix-current-directory () - ;; FIXME: Gcc justifiably complains that getwd is dangerous and should - ;; not be used; especially with a hardwired 1024 buffer size, yecch. - ;; This should be rewritten to use getcwd(3), perhaps by writing - ;; a C service routine to do the actual call to getcwd(3) and check - ;; of return values. - (with-alien ((buf (array char 1024))) - (values (not (zerop (alien-funcall (extern-alien "getwd" - (function int (* char))) - (cast buf (* char))))) - (cast buf c-string)))) +;;; 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 () + ;; This implementation relies on a BSD/Linux extension to getcwd() + ;; 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. + ;; + ;; 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 netbsd sunos osf1 darwin) (,stub,) + #!+(or linux openbsd freebsd netbsd sunos osf1 darwin) + (or (newcharstar-string (alien-funcall (extern-alien "getcwd" + (function (* char) + (* char) + size-t)) + nil + #!+(or linux openbsd freebsd netbsd darwin) 0 + #!+(or sunos osf1) 1025)) + (simple-perror "getcwd"))) + +;;; Return the Unix current directory as a SIMPLE-STRING terminated +;;; by a slash character. +(defun posix-getcwd/ () + (concatenate 'string (posix-getcwd) "/")) + +;;; Convert at the UNIX level from a possibly relative filename to +;;; an absolute filename. +;;; +;;; FIXME: Do we still need this even as we switch to +;;; *DEFAULT-PATHNAME-DEFAULTS*? I think maybe we do, since it seems +;;; to be valid for the user to set *DEFAULT-PATHNAME-DEFAULTS* to +;;; have a NIL directory component, and then this'd be the only way to +;;; interpret a relative directory specification. But I don't find the +;;; ANSI pathname documentation to be a model of clarity. Maybe +;;; someone who understands it better can take a look at this.. -- WHN +(defun unix-maybe-prepend-current-directory (name) + (declare (simple-string name)) + (if (and (> (length name) 0) (char= (schar name 0) #\/)) + name + (concatenate 'simple-string (posix-getcwd/) name))) ;;; Duplicate an existing file descriptor (given as the argument) and ;;; return it. If FD is not a valid file descriptor, NIL and an error @@ -310,25 +344,42 @@ (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) - -;;; Invoke readlink(2) on the file name specified by the simple string -;;; PATH. Return up to two values: the contents of the symbolic link -;;; if the call is successful, or NIL and the Unix error number. +(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 +;;; failure. (defun unix-readlink (path) (declare (type unix-pathname path)) - (with-alien ((buf (array char 1024))) - (syscall ("readlink" c-string (* char) int) - (let ((string (make-string result))) - (sb!kernel:copy-from-system-area - (alien-sap buf) 0 - string (* sb!vm:vector-data-offset sb!vm:word-bits) - (* result sb!vm:byte-bits)) - string) - path (cast buf (* char)) 1024))) + (with-alien ((ptr (* char) + (alien-funcall (extern-alien + "wrapped_readlink" + (function (* char) c-string)) + path))) + (if (null-alien ptr) + (values nil (get-errno)) + (multiple-value-prog1 + (values (with-alien ((c-string c-string ptr)) c-string) + nil) + (free-alien ptr))))) ;;; UNIX-UNLINK accepts a name and deletes the directory entry for that ;;; name and the file if this is the last link. @@ -336,26 +387,6 @@ (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))) @@ -363,11 +394,9 @@ (cast buf c-string) (cast buf (* char)) 256))) -;;; Write the core image of the file described by FD to disk. -(defun unix-fsync (fd) - (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 @@ -375,20 +404,21 @@ ;;; 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) - (unsigned-byte 31) (mod 1000000) - (unsigned-byte 31) (mod 1000000))) + (unsigned-byte 31) (integer 0 1000000) + (unsigned-byte 31) (integer 0 1000000))) (with-alien ((usage (struct rusage))) (syscall* ("getrusage" int (* (struct rusage))) (values t @@ -429,30 +459,29 @@ ;;;; 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. @@ -519,17 +548,20 @@ ;;; Note that st-dev is a long, not a dev-t. This is because dev-t on ;;; linux 32 bit archs is a 64 bit quantity, but alien doesn's support ;;; those. We don't actually access that field anywhere, though, so -;;; until we can get 64 bit alien support it'll do. -(def-alien-type nil +;;; until we can get 64 bit alien support it'll do. Also note that +;;; 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?":-| +(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) ;ditto - (st-size off-t) + (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) @@ -538,8 +570,19 @@ ;;; shared C-struct-to-multiple-VALUES conversion for the stat(2) ;;; family of Unix system calls +;;; +;;; FIXME: I think this should probably not be INLINE. However, when +;;; this was not inline, it seemed to cause memory corruption +;;; problems. My first guess is that it's a bug in the FFI code, where +;;; the WITH-ALIEN expansion doesn't deal well with being wrapped +;;; around a call to a function returning >10 values. But I didn't try +;;; to figure it out, just inlined it as a quick fix. Perhaps someone +;;; who's motivated to debug the FFI code can go over the DISASSEMBLE +;;; output in the not-inlined case and see whether there's a problem, +;;; and maybe even find a fix.. +(declaim (inline %extract-stat-results)) (defun %extract-stat-results (wrapped-stat) - (declare (type (alien (* (struct wrapped_stat))))) + (declare (type (alien (* (struct wrapped_stat))) wrapped-stat)) (values t (slot wrapped-stat 'st-dev) (slot wrapped-stat 'st-ino) @@ -548,95 +591,77 @@ (slot wrapped-stat 'st-uid) (slot wrapped-stat 'st-gid) (slot wrapped-stat 'st-rdev) - ;; FIXME: OpenBSD has a 64-bit st_size slot, which is - ;; basically a good thing, except that it is too - ;; 21st-century for sbcl-0.6.12.8's FFI to handle. As a - ;; quick kludgy workaround, we return a 0 placeholder from - ;; this function, and downstream we stub out the FILE-LENGTH - ;; operation (which is the only place that SBCL actually - ;; uses the SIZE value returned from any UNIX-STAT-ish call). - #!+openbsd 0 - #!-openbsd (slot wrapped-stat 'st-size) + (slot wrapped-stat 'st-size) (slot wrapped-stat 'st-atime) (slot wrapped-stat 'st-mtime) (slot wrapped-stat 'st-ctime) (slot wrapped-stat 'st-blksize) (slot wrapped-stat 'st-blocks))) -;;; The stat(2) family of Unix system calls are implemented as calls -;;; to C-level wrapper functions which copies all the raw "struct -;;; stat" slots into a system-independent format, so that we don't -;;; need to mess around with tweaking the Lisp code to correspond to -;;; different OS/CPU combinations. +;;; Unix system calls in the stat(2) family are handled by calls to +;;; C-level wrapper functions which copy all the raw "struct stat" +;;; slots into the system-independent wrapped_stat format. ;;; stat(2) <-> stat_wrapper() ;;; fstat(2) <-> fstat_wrapper() ;;; lstat(2) <-> lstat_wrapper() -;;; Then this function is used to convert all the stat slots into -;;; multiple return values. (defun unix-stat (name) (declare (type unix-pathname name)) (with-alien ((buf (struct wrapped_stat))) (syscall ("stat_wrapper" c-string (* (struct wrapped_stat))) - (%extract-stat-results buf) + (%extract-stat-results (addr buf)) name (addr buf)))) (defun unix-lstat (name) (declare (type unix-pathname name)) (with-alien ((buf (struct wrapped_stat))) (syscall ("lstat_wrapper" c-string (* (struct wrapped_stat))) - (%extract-stat-results buf) + (%extract-stat-results (addr buf)) name (addr buf)))) (defun unix-fstat (fd) (declare (type unix-fd fd)) (with-alien ((buf (struct wrapped_stat))) (syscall ("fstat_wrapper" int (* (struct wrapped_stat))) - (%extract-stat-results buf) + (%extract-stat-results (addr buf)) fd (addr buf)))) ;;;; time.h -;; the POSIX.4 structure for a time value. This is like a `struct -;; timeval' but has nanoseconds instead of microseconds. -(def-alien-type nil +;; the POSIX.4 structure for a time value. This is like a "struct +;; timeval" but has nanoseconds instead of microseconds. +(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] (tm-hour int) ; Hours. [0-23] - (tm-mday int) ; Day. [1-31] - (tm-mon int) ; Month. [0-11] - (tm-year int) ; Year - 1900. - (tm-wday int) ; Day of week. [0-6] - (tm-yday int) ; Days in year.[0-365] - (tm-isdst int) ; DST. [-1/0/1] - (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) + (tm-mday int) ; Day. [1-31] + (tm-mon int) ; Month. [0-11] + (tm-year int) ; Year - 1900. + (tm-wday int) ; Day of week. [0-6] + (tm-yday int) ; Days in year. [0-365] + (tm-isdst int) ; DST. [-1/0/1] + (tm-gmtoff long) ; Seconds east of UTC. + (tm-zone c-string))) ; Timezone abbreviation. + +(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 @@ -660,12 +685,95 @@ (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 @@ -673,13 +781,12 @@ ;;; 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) @@ -691,96 +798,71 @@ ((eql kind s-iflnk) :link) (t :special)))))) -(defun unix-maybe-prepend-current-directory (name) - (declare (simple-string name)) - (if (and (> (length name) 0) (char= (schar name 0) #\/)) - name - (multiple-value-bind (win dir) (unix-current-directory) - (if win - (concatenate 'simple-string dir "/" name) - name)))) - -;;; Return the pathname with all symbolic links resolved. -;;; -;;; FIXME: Could we just use Unix readlink(2) instead? +;;; Is the Unix pathname PATHNAME relative, instead of absolute? (E.g. +;;; "passwd" or "etc/passwd" instead of "/etc/passwd"?) +(defun relative-unix-pathname? (pathname) + (declare (type simple-string pathname)) + (or (zerop (length pathname)) + (char/= (schar pathname 0) #\/))) + +;;; Return PATHNAME with all symbolic links resolved. PATHNAME should +;;; already be a complete absolute Unix pathname, since at least in +;;; sbcl-0.6.12.36 we're called only from TRUENAME, and only after +;;; paths have been converted to absolute paths, so we don't need to +;;; try to handle any more generality than that. (defun unix-resolve-links (pathname) - (declare (simple-string pathname)) - (let ((len (length pathname)) - (pending pathname)) - (declare (fixnum len) (simple-string pending)) - (if (zerop len) - pathname - (let ((result (make-string 1024 :initial-element (code-char 0))) - (fill-ptr 0) - (name-start 0)) - (loop - (let* ((name-end (or (position #\/ pending :start name-start) len)) - (new-fill-ptr (+ fill-ptr (- name-end name-start)))) - (replace result pending - :start1 fill-ptr - :end1 new-fill-ptr - :start2 name-start - :end2 name-end) - (let ((kind (unix-file-kind (if (zerop name-end) "/" result) t))) - (unless kind (return nil)) - (cond ((eq kind :link) - (multiple-value-bind (link err) (unix-readlink result) - (unless link - (error 'simple-file-error - :pathname pathname - :format-control - "~@" - :format-arguments (list (subseq - result 0 fill-ptr) - (strerror err)))) - (cond ((or (zerop (length link)) - (char/= (schar link 0) #\/)) - ;; It's a relative link. - (fill result (code-char 0) - :start fill-ptr - :end new-fill-ptr)) - ((string= result "/../" :end1 4) - ;; It's across the super-root. - (let ((slash (or (position #\/ result :start 4) - 0))) - (fill result (code-char 0) - :start slash - :end new-fill-ptr) - (setf fill-ptr slash))) - (t - ;; It's absolute. - (and (> (length link) 0) - (char= (schar link 0) #\/)) - (fill result (code-char 0) :end new-fill-ptr) - (setf fill-ptr 0))) - (setf pending - (if (= name-end len) - link - (concatenate 'simple-string - link - (subseq pending name-end)))) - (setf len (length pending)) - (setf name-start 0))) - ((= name-end len) - (return (subseq result 0 new-fill-ptr))) - ((eq kind :directory) - (setf (schar result new-fill-ptr) #\/) - (setf fill-ptr (1+ new-fill-ptr)) - (setf name-start (1+ name-end))) - (t - (return nil)))))))))) + (declare (type simple-base-string pathname)) + (aver (not (relative-unix-pathname? pathname))) + (/noshow "entering UNIX-RESOLVE-LINKS") + (loop with previous-pathnames = nil do + (/noshow pathname previous-pathnames) + (let ((link (unix-readlink pathname))) + (/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 + ;; can return broken links, so that even without + ;; Unix-specific extensions to do interesting things with + ;; them, at least Lisp programs can see them and, if + ;; necessary, delete them. (This is handy e.g. when your + ;; managed-by-Lisp directories are visited by Emacs, which + ;; creates broken links as notes to itself.) + (if (null link) + (return pathname) + (let ((new-pathname + (unix-simplify-pathname + (if (relative-unix-pathname? link) + (let* ((dir-len (1+ (position #\/ + pathname + :from-end t))) + (dir (subseq pathname 0 dir-len))) + (/noshow dir) + (concatenate 'base-string dir link)) + link)))) + (if (unix-file-kind new-pathname) + (setf pathname new-pathname) + (return pathname))))) + ;; To generalize the principle that even if portable Lisp code + ;; can't do anything interesting with a broken symlink, at + ;; least it should be able to see and delete it, when we + ;; detect a cyclic link, we return the link itself. (So even + ;; though portable Lisp code can't do anything interesting + ;; with a cyclic link, at least it can see it and delete it.) + (if (member pathname previous-pathnames :test #'string=) + (return pathname) + (push pathname previous-pathnames)))) (defun unix-simplify-pathname (src) - (declare (simple-string src)) + (declare (type simple-base-string src)) (let* ((src-len (length src)) - (dst (make-string src-len)) + (dst (make-string src-len :element-type 'base-char)) (dst-len 0) (dots 0) (last-slash nil)) (macrolet ((deposit (char) - `(progn - (setf (schar dst dst-len) ,char) - (incf dst-len)))) + `(progn + (setf (schar dst dst-len) ,char) + (incf dst-len)))) (dotimes (src-index src-len) (let ((char (schar src src-index))) (cond ((char= char #\.) @@ -790,12 +872,12 @@ ((char= char #\/) (case dots (0 - ;; Either ``/...' or ``...//...' + ;; either ``/...' or ``...//...' (unless last-slash (setf last-slash dst-len) (deposit char))) (1 - ;; Either ``./...'' or ``..././...'' + ;; either ``./...'' or ``..././...'' (decf dst-len)) (2 ;; We've found .. @@ -823,7 +905,7 @@ (setf last-slash dst-len) (deposit char)))) (t - ;; Something other than a dot between slashes. + ;; something other than a dot between slashes (setf last-slash dst-len) (deposit char))) (setf dots 0)) @@ -847,7 +929,8 @@ (position #\/ dst :end last-slash :from-end t))) (if prev-prev-slash (setf dst-len (1+ prev-prev-slash)) - (return-from unix-simplify-pathname "./"))))))) + (return-from unix-simplify-pathname + (coerce "./" 'simple-base-string)))))))) (cond ((zerop dst-len) "./") ((= dst-len src-len) @@ -855,6 +938,17 @@ (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... @@ -875,7 +969,9 @@ `(multiple-value-bind (,word ,bit) (floor ,offset 32) (setf (deref (slot ,fd-set 'fds-bits) ,word) (logand (deref (slot ,fd-set 'fds-bits) ,word) - (sb!kernel:32bit-logical-not + ;; FIXME: This may not be quite right for 64-bit + ;; ports of SBCL. --njf, 2004-08-04 + (sb!kernel:word-logical-not (truly-the (unsigned-byte 32) (ash 1 ,bit)))))))) ;;; not checked for linux...