88 lines
2.2 KiB
Scheme
88 lines
2.2 KiB
Scheme
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;;; Flags for open(2) and fcntl(2).
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;;; Copyright (c) 1993 by Olin Shivers.
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;;; Copyright (c) 1994 by Brian D. Carlstrom
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(define-syntax define-open-flags
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(syntax-rules ()
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((define-opens form ...)
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(begin (define-enum-constant "open" . form) ...))))
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(define-open-flags
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;; POSIX
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(read #x0000)
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(write #x0001)
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(read+write #x0002)
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(nonblocking #x0800) ; no delay
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(append #x0400) ; set append mode
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;; Linux
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(shlock #x0004) ; open with shared file lock
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(exlock #x0008) ; open with exclusive file lock
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(async #x2000) ; signal pgrep when data ready
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(fsync #x1000) ; synchronus writes
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;; POSIX
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(create #x0040) ; create if nonexistant
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(truncate #x0200) ; truncate to zero length
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(exclusive #x0080) ; error if already exists
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(no-control-tty #x0100)) ; don't assign controlling terminal
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(define open/access-mask
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(bitwise-ior open/read
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(bitwise-ior open/write open/read+write)))
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;;;; fcntl
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;;;; Rough sketch only. Will define a separate proc for each fcntl command.
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;
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;;;; fcntl commands
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;dup
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;
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;get-flags ; Only gives close-on-exec bit.
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;set-flags
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;
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;get-status ; Returns open flags + get-status flags (below)
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;set-status ; Can set: append, sync, async, nbio, nonblocking, no-delay
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;
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;get-lock
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;set-lock
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;nonblocking-set-lock
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;
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;get-record-lock
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;set-record-lock
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;set-record-lock-noblock
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;
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;get-owner ; Not POSIX
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;set-owner ; Not POSIX
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;remote-set-lock ; Not POSIX
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;nonblocking-remote-set-lock ; Not POSIX
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;remote-get-lock ; Not POSIX
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;
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;;;; Flags
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;
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;close-on-exec ; get-flags
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;
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;async ; get-status
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;no-delay ; get-status
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;nbio ; get-status
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;
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;;; These are internal; they are not part of the supported scsh interface.
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(define fcntl/close-on-exec 1)
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(define fcntl/dupfd 0)
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(define fcntl/get-fd-flags 1)
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(define fcntl/set-fd-flags 2)
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(define fcntl/get-file-flags 3)
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(define fcntl/set-file-flags 4)
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(define fcntl/get-owner 9) ; Not POSIX
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(define fcntl/set-owner 8) ; Not POSIX
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(define fcntl/get-record-lock 5) ; F_GETLK
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(define fcntl/set-record-lock-noblock 6) ; F_SETLK
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(define fcntl/set-record-lock 7) ; F_SETLKW
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(define lock/read 0) ; F_RDLCK
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(define lock/release 2) ; F_UNLCK
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(define lock/write 1) ; F_WRLCK
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