factor/library/unix/io.factor

312 lines
8.0 KiB
Factor

! Copyright (C) 2004, 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
IN: io-internals
USING: alien assembler errors generic hashtables io kernel
kernel-internals lists math parser sequences strings threads
unix-internals vectors ;
! We want namespaces::bind to shadow the bind system call from
! unix-internals
USING: namespaces ;
! This will go elsewhere soon
: byte-bit ( n alien -- byte bit )
over -5 shift alien-unsigned-4 swap 31 bitand ;
: bit-length ( n -- n ) cell / ceiling ;
: <bit-array> ( n -- array )
bit-length <byte-array> ;
: bit-nth ( n alien -- ? )
byte-bit 1 swap shift bitand 0 > ;
: set-bit ( ? byte bit -- byte )
1 swap shift rot [ bitor ] [ bitnot bitand ] ifte ;
: set-bit-nth ( ? n alien -- )
[ byte-bit set-bit ] 2keep
swap -5 shift set-alien-unsigned-4 ;
: clear-bits ( alien len -- )
bit-length [ 0 -rot set-alien-unsigned-cell ] each-with ;
! Global variables
SYMBOL: read-fdset
SYMBOL: read-tasks
SYMBOL: write-fdset
SYMBOL: write-tasks
! Some general stuff
: file-mode OCT: 0600 ;
: (io-error) err_no strerror throw ;
: check-null ( n -- ) 0 = [ (io-error) ] when ;
: io-error ( n -- ) 0 < [ (io-error) ] when ;
: init-handle ( fd -- ) F_SETFL O_NONBLOCK fcntl io-error ;
! Common delegate of native stream readers and writers
TUPLE: port handle buffer error timeout cutoff output? sbuf eof? ;
: make-buffer ( n -- buffer/f )
dup 0 > [ <buffer> ] [ drop f ] ifte ;
C: port ( handle buffer -- port )
[ 0 swap set-port-timeout ] keep
[ 0 swap set-port-cutoff ] keep
[ >r make-buffer r> set-delegate ] keep
[ >r dup init-handle r> set-port-handle ] keep
80 <sbuf> over set-port-sbuf ;
: touch-port ( port -- )
! "touch-port called\n" 14 getenv fwrite 14 getenv fflush
dup port-timeout dup 0 =
[ 2drop ] [ millis + swap set-port-cutoff ] ifte ;
M: port set-timeout ( timeout port -- )
[ set-port-timeout ] keep touch-port ;
: buffered-port 8192 <port> ;
: >port< dup port-handle swap delegate ;
: pending-error ( port -- )
dup port-error f rot set-port-error throw ;
: report-error ( error port -- )
[ "Error on fd " % dup port-handle # ": " % swap % ] "" make
swap set-port-error ;
: defer-error ( port -- ? )
#! Return t if it is an unrecoverable error.
err_no dup EAGAIN = over EINTR = or
[ 2drop f ] [ strerror swap report-error ] ifte ;
! Associates a port with a list of continuations waiting on the
! port to finish I/O
TUPLE: io-task port callbacks ;
C: io-task ( port -- ) [ set-io-task-port ] keep ;
! Multiplexer
GENERIC: do-io-task ( task -- ? )
GENERIC: task-container ( task -- vector )
: io-task-fd io-task-port port-handle ;
: add-io-task ( callback task -- )
[ >r unit r> set-io-task-callbacks ] keep
dup io-task-fd over task-container 2dup hash [
"Cannot perform multiple I/O ops on the same port" throw
] when set-hash ;
: remove-io-task ( task -- )
dup io-task-fd swap task-container remove-hash ;
: pop-callback ( task -- callback )
dup io-task-callbacks uncons dup [
rot set-io-task-callbacks
] [
drop swap remove-io-task
] ifte ;
: handle-fd ( task -- )
dup do-io-task [
dup io-task-port touch-port pop-callback call
] [
drop
] ifte ;
: timeout? ( port -- ? )
port-cutoff dup 0 = not swap millis < and ;
: handle-fdset ( fdset tasks -- )
[
cdr dup io-task-port timeout? [
dup io-task-port "Timeout" swap report-error
nip pop-callback call
] [
tuck io-task-fd swap bit-nth
[ handle-fd ] [ drop ] ifte
] ifte
] hash-each-with ;
: init-fdset ( fdset tasks -- )
>r dup FD_SETSIZE clear-bits r>
[ car t swap rot set-bit-nth ] hash-each-with ;
: init-fdsets ( -- read write except )
read-fdset get [ read-tasks get init-fdset ] keep
write-fdset get [ write-tasks get init-fdset ] keep
NULL ;
: io-multiplex ( timeout -- )
>r FD_SETSIZE init-fdsets r> make-timeval select drop
read-fdset get read-tasks get handle-fdset
write-fdset get write-tasks get handle-fdset ;
! Readers
: <reader> ( fd -- stream )
buffered-port <line-reader> ;
: open-read ( path -- fd )
O_RDONLY file-mode open dup io-error ;
: reader-eof ( reader -- )
dup port-sbuf empty? [ t swap set-port-eof? ] [ drop ] ifte ;
: (refill) ( port -- n )
>port< dup buffer-end swap buffer-capacity read ;
: refill ( port -- ? )
#! Return f if there is a recoverable error
dup buffer-length 0 = [
dup (refill) dup 0 >= [
swap n>buffer t
] [
drop defer-error
] ifte
] [
drop t
] ifte ;
! Reading character counts
: read-step ( count reader -- ? )
dup port-sbuf -rot >r over length - ( remaining) r>
2dup buffer-length <= [
buffer> nappend t
] [
buffer>> nip nappend f
] ifte ;
: can-read-count? ( count reader -- ? )
dup pending-error 0 over port-sbuf set-length read-step ;
TUPLE: read-task count ;
C: read-task ( count port -- task )
[ >r <io-task> r> set-delegate ] keep
[ set-read-task-count ] keep ;
: >read-task< dup read-task-count swap io-task-port ;
M: read-task do-io-task ( task -- ? )
>read-task< dup refill [
dup buffer-empty? [
reader-eof drop t
] [
read-step
] ifte
] [
2drop f
] ifte ;
M: read-task task-container drop read-tasks get ;
: wait-to-read ( count port -- )
2dup can-read-count? [
[ -rot <read-task> add-io-task stop ] callcc0
] unless 2drop ;
M: port stream-read ( count stream -- string )
[ wait-to-read ] keep dup port-eof?
[ drop f ] [ port-sbuf >string ] ifte ;
M: port stream-read1 ( stream -- char/f )
1 over wait-to-read dup port-eof?
[ drop f ] [ port-sbuf first ] ifte ;
! Writers
: open-write ( path -- fd )
O_WRONLY O_CREAT bitor O_TRUNC bitor file-mode open
dup io-error ;
: <writer> ( fd -- writer )
buffered-port t over set-port-output? ;
: write-step ( port -- )
dup >port< dup buffer@ swap buffer-length write dup 0 >= [
swap buffer-consume
] [
drop defer-error drop
] ifte ;
: can-write? ( len writer -- ? )
#! If the buffer is empty and the string is too long,
#! extend the buffer.
dup pending-error
dup buffer-empty? [
2drop t
] [
[ buffer-fill + ] keep buffer-capacity <=
] ifte ;
TUPLE: write-task ;
C: write-task ( port -- task )
[ >r <io-task> r> set-delegate ] keep ;
M: write-task do-io-task
io-task-port dup buffer-length 0 = over port-error or [
0 swap buffer-reset t
] [
write-step f
] ifte ;
M: write-task task-container drop write-tasks get ;
: add-write-io-task ( callback task -- )
dup io-task-fd write-tasks get hash [
dup write-task? [
[ nip io-task-callbacks cons ] keep
set-io-task-callbacks
] [
drop add-io-task
] ifte
] [
add-io-task
] ifte* ;
M: port stream-flush ( stream -- )
dup port-output? [
[ swap <write-task> add-write-io-task stop ] callcc0
] when drop ;
M: port stream-finish ( stream -- ) drop ;
: wait-to-write ( len port -- )
tuck can-write? [ dup stream-flush ] unless pending-error ;
M: port stream-write1 ( char writer -- )
1 over wait-to-write ch>buffer ;
M: port stream-format ( string style writer -- )
nip over length over wait-to-write >buffer ;
M: port stream-close ( stream -- )
dup stream-flush
dup port-handle close
delegate [ buffer-free ] when* ;
! Make a duplex stream for reading/writing a pair of fds
: <fd-stream> ( infd outfd flush? -- stream )
>r >r <reader> r> <writer> r> <duplex-stream> ;
USE: io
: init-io ( -- )
#! Should only be called on startup. Calling this at any
#! other time can have unintended consequences.
global [
{{ }} clone read-tasks set
FD_SETSIZE <bit-array> read-fdset set
{{ }} clone write-tasks set
FD_SETSIZE <bit-array> write-fdset set
0 1 t <fd-stream> stdio set
] bind ;