X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcode%2Funix.lisp;h=b1193bf7fec735e4260ac7ec50590293d4797e7d;hb=97e52e46f9bcb054eec35a9c326db75993441ca1;hp=0c03f2b96c4f1144b145a9603bee320d7bef8c5a;hpb=5e3fb5149366dd84a5cb76bf1cf5f2324c24ca57;p=sbcl.git diff --git a/src/code/unix.lisp b/src/code/unix.lisp index 0c03f2b..b1193bf 100644 --- a/src/code/unix.lisp +++ b/src/code/unix.lisp @@ -90,7 +90,7 @@ ;;;; hacking the Unix environment -(def-alien-routine ("getenv" posix-getenv) c-string +(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)) @@ -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. @@ -264,6 +264,16 @@ (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 +281,24 @@ ;; 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) (,stub,) + #!+(or linux openbsd freebsd sunos osf1) + (or (newcharstar-string (alien-funcall (extern-alien "getcwd" + (function (* char) + (* char) + size-t)) + nil + #!+(or linux openbsd freebsd) 0 + #!+(or sunos osf1) 1025)) + (simple-perror "getcwd"))) ;;; Return the Unix current directory as a SIMPLE-STRING terminated ;;; by a slash character. @@ -318,10 +336,25 @@ (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 +379,6 @@ (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))) @@ -392,8 +405,9 @@ ;;; 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) @@ -439,36 +453,29 @@ ;;;; 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." - ;; FIXME: These DECLAREs don't belong at macroexpansion time. They - ;; should be done at runtime instead. Perhaps we could just redo - ;; UNIX-FAST-SELECT as an inline function, and then all the - ;; declarations would work nicely. - #| +;;;; 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)) - |# ;; 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. @@ -539,7 +546,7 @@ ;;; 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-ino ino-t) @@ -614,13 +621,13 @@ ;; 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] @@ -634,9 +641,9 @@ (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) + (minutes-west sb!alien:int :out) (daylight-savings-p sb!alien:boolean :out)) (defun unix-get-minutes-west (secs) @@ -654,7 +661,7 @@ ;;; 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 @@ -724,11 +731,11 @@ (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 @@ -747,7 +754,7 @@ 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) @@ -848,6 +855,17 @@ (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...