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authorLudovic Courtès <ludo@gnu.org>2016-05-01 23:59:05 +0200
committerLudovic Courtès <ludo@gnu.org>2016-05-02 00:05:36 +0200
commitae4ff9f359514937878cf82f4ac46dd14aac9056 (patch)
treedab4f54a6be817401a754e182e3475be773774a7
parent00cd41974e9579eccedb948d5eebed442efb600e (diff)
downloadguix-ae4ff9f359514937878cf82f4ac46dd14aac9056.tar
guix-ae4ff9f359514937878cf82f4ac46dd14aac9056.tar.gz
syscalls: Add 'tcgetattr' and 'tcsetattr' bindings.
* guix/build/syscalls.scm (bits->symbols-body, define-bits) (local-flags): New macros. (TCSANOW, TCSADRAIN, TCSAFLUSH): New variables. (<termios>): New record type. (%termios): New C structure. (tcgetattr, tcsetattr): New procedures. * tests/syscalls.scm ("tcgetattr ENOTTY", "tcgetattr") ("tcsetattr"): New tests.
-rw-r--r--guix/build/syscalls.scm131
-rw-r--r--tests/syscalls.scm25
2 files changed, 156 insertions, 0 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index 721c590f69..4e543d70d8 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -100,6 +100,22 @@
interface-broadcast-address
network-interfaces
+ termios?
+ termios-input-flags
+ termios-output-flags
+ termios-control-flags
+ termios-local-flags
+ termios-line-discipline
+ termios-control-chars
+ termios-input-speed
+ termios-output-speed
+ local-flags
+ TCSANOW
+ TCSADRAIN
+ TCSAFLUSH
+ tcgetattr
+ tcsetattr
+
window-size?
window-size-rows
window-size-columns
@@ -996,6 +1012,121 @@ network interface. This is implemented using the 'getifaddrs' libc function."
;;; Terminals.
;;;
+(define-syntax bits->symbols-body
+ (syntax-rules ()
+ ((_ bits () ())
+ '())
+ ((_ bits (name names ...) (value values ...))
+ (let ((result (bits->symbols-body bits (names ...) (values ...))))
+ (if (zero? (logand bits value))
+ result
+ (cons 'name result))))))
+
+(define-syntax define-bits
+ (syntax-rules (define)
+ "Define the given numerical constants under CONSTRUCTOR, such that
+ (CONSTRUCTOR NAME) returns VALUE. Define BITS->SYMBOLS as a procedure that,
+given an integer, returns the list of names of the constants that are or'd."
+ ((_ constructor bits->symbols (define names values) ...)
+ (begin
+ (define-syntax constructor
+ (syntax-rules (names ...)
+ ((_ names) values) ...
+ ((_ several (... ...))
+ (logior (constructor several) (... ...)))))
+ (define (bits->symbols bits)
+ (bits->symbols-body bits (names ...) (values ...)))
+ (define names values) ...))))
+
+;; 'local-flags' bits from <bits/termios.h>
+(define-bits local-flags
+ local-flags->symbols
+ (define ISIG #o0000001)
+ (define ICANON #o0000002)
+ (define XCASE #o0000004)
+ (define ECHO #o0000010)
+ (define ECHOE #o0000020)
+ (define ECHOK #o0000040)
+ (define ECHONL #o0000100)
+ (define NOFLSH #o0000200)
+ (define TOSTOP #o0000400)
+ (define ECHOCTL #o0001000)
+ (define ECHOPRT #o0002000)
+ (define ECHOKE #o0004000)
+ (define FLUSHO #o0010000)
+ (define PENDIN #o0040000)
+ (define IEXTEN #o0100000)
+ (define EXTPROC #o0200000))
+
+;; "Actions" values for 'tcsetattr'.
+(define TCSANOW 0)
+(define TCSADRAIN 1)
+(define TCSAFLUSH 2)
+
+(define-record-type <termios>
+ (termios input-flags output-flags control-flags local-flags
+ line-discipline control-chars
+ input-speed output-speed)
+ termios?
+ (input-flags termios-input-flags)
+ (output-flags termios-output-flags)
+ (control-flags termios-control-flags)
+ (local-flags termios-local-flags)
+ (line-discipline termios-line-discipline)
+ (control-chars termios-control-chars)
+ (input-speed termios-input-speed)
+ (output-speed termios-output-speed))
+
+(define-c-struct %termios ;<bits/termios.h>
+ sizeof-termios
+ termios
+ read-termios
+ write-termios!
+ (input-flags unsigned-int)
+ (output-flags unsigned-int)
+ (control-flags unsigned-int)
+ (local-flags unsigned-int)
+ (line-discipline uint8)
+ (control-chars (array uint8 32))
+ (input-speed unsigned-int)
+ (output-speed unsigned-int))
+
+(define tcgetattr
+ (let ((proc (syscall->procedure int "tcgetattr" (list int '*))))
+ (lambda (fd)
+ "Return the <termios> structure for the tty at FD."
+ (let* ((bv (make-bytevector sizeof-termios))
+ (ret (proc fd (bytevector->pointer bv)))
+ (err (errno)))
+ (if (zero? ret)
+ (read-termios bv)
+ (throw 'system-error "tcgetattr" "~A"
+ (list (strerror err))
+ (list err)))))))
+
+(define tcsetattr
+ (let ((proc (syscall->procedure int "tcsetattr" (list int int '*))))
+ (lambda (fd actions termios)
+ "Use TERMIOS for the tty at FD. ACTIONS is one of 'TCSANOW',
+'TCSADRAIN', or 'TCSAFLUSH'; see tcsetattr(3) for details."
+ (define bv
+ (make-bytevector sizeof-termios))
+
+ (let-syntax ((match/write (syntax-rules ()
+ ((_ fields ...)
+ (match termios
+ (($ <termios> fields ...)
+ (write-termios! bv 0 fields ...)))))))
+ (match/write input-flags output-flags control-flags local-flags
+ line-discipline control-chars input-speed output-speed))
+
+ (let ((ret (proc fd actions (bytevector->pointer bv)))
+ (err (errno)))
+ (unless (zero? ret)
+ (throw 'system-error "tcgetattr" "~A"
+ (list (strerror err))
+ (list err)))))))
+
(define-syntax TIOCGWINSZ ;<asm-generic/ioctls.h>
(identifier-syntax #x5413))
diff --git a/tests/syscalls.scm b/tests/syscalls.scm
index 71bcbc4d32..ab1e13984d 100644
--- a/tests/syscalls.scm
+++ b/tests/syscalls.scm
@@ -259,6 +259,31 @@
(#f #f)
(lo (interface-address lo)))))))
+(test-equal "tcgetattr ENOTTY"
+ ENOTTY
+ (catch 'system-error
+ (lambda ()
+ (call-with-input-file "/dev/null"
+ (lambda (port)
+ (tcgetattr (fileno port)))))
+ (compose system-error-errno list)))
+
+(test-skip (if (and (file-exists? "/proc/self/fd/0")
+ (string-prefix? "/dev/pts/" (readlink "/proc/self/fd/0")))
+ 0
+ 2))
+
+(test-assert "tcgetattr"
+ (let ((termios (tcgetattr 0)))
+ (and (termios? termios)
+ (> (termios-input-speed termios) 0)
+ (> (termios-output-speed termios) 0))))
+
+(test-assert "tcsetattr"
+ (let ((first (tcgetattr 0)))
+ (tcsetattr 0 TCSANOW first)
+ (equal? first (tcgetattr 0))))
+
(test-assert "terminal-window-size ENOTTY"
(call-with-input-file "/dev/null"
(lambda (port)