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syscalls: Avoid repeated calls to 'syscall->procedure'.

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Commit 7df4d3465d305271d4fdf4e6f886a248d63b82c4 and others changed
'mount', 'umount', & co. so they would call 'syscall->procedure' at each
call.  This change reverts to the previous behavior, where
'syscall->procedure' is called once.

* guix/build/syscalls.scm (mount, umount, reboot, load-linux-module):
Call 'syscall->procedure' only once.
This commit is contained in:
Ludovic Courtès 2022-09-08 13:46:42 +02:00
parent 392e97ed08
commit 8f53630f2f
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GPG Key ID: 090B11993D9AEBB5
1 changed files with 58 additions and 56 deletions
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114
guix/build/syscalls.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014-2022 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
@ -549,50 +549,50 @@ the last argument of `mknod'."
(define MNT_EXPIRE 4)
(define UMOUNT_NOFOLLOW 8)
(define-as-needed (mount source target type
#:optional (flags 0) options
#:key (update-mtab? #f))
"Mount device SOURCE on TARGET as a file system TYPE.
Optionally, FLAGS may be a bitwise-or of the MS_* <sys/mount.h>
constants, and OPTIONS may be a string. When FLAGS contains
MS_REMOUNT, SOURCE and TYPE are ignored. When UPDATE-MTAB? is true,
update /etc/mtab. Raise a 'system-error' exception on error."
(define-as-needed mount
;; XXX: '#:update-mtab?' is not implemented by core 'mount'.
(let ((proc (syscall->procedure int "mount" `(* * * ,unsigned-long *))))
(let-values (((ret err)
(proc (if source
(string->pointer source)
%null-pointer)
(string->pointer target)
(if type
(string->pointer type)
%null-pointer)
flags
(if options
(string->pointer options)
%null-pointer))))
(unless (zero? ret)
(throw 'system-error "mount" "mount ~S on ~S: ~A"
(list source target (strerror err))
(list err)))
(when update-mtab?
(augment-mtab source target type options)))))
(lambda* (source target type
#:optional (flags 0) options
#:key (update-mtab? #f))
"Mount device SOURCE on TARGET as a file system TYPE.
Optionally, FLAGS may be a bitwise-or of the MS_* <sys/mount.h> constants, and
OPTIONS may be a string. When FLAGS contains MS_REMOUNT, SOURCE and TYPE are
ignored. When UPDATE-MTAB? is true, update /etc/mtab. Raise a 'system-error'
exception on error."
(let-values (((ret err)
(proc (if source
(string->pointer source)
%null-pointer)
(string->pointer target)
(if type
(string->pointer type)
%null-pointer)
flags
(if options
(string->pointer options)
%null-pointer))))
(unless (zero? ret)
(throw 'system-error "mount" "mount ~S on ~S: ~A"
(list source target (strerror err))
(list err)))
(when update-mtab?
(augment-mtab source target type options))))))
(define-as-needed (umount target
#:optional (flags 0)
#:key (update-mtab? #f))
"Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_*
constants from <sys/mount.h>."
(define-as-needed umount
;; XXX: '#:update-mtab?' is not implemented by core 'umount'.
(let ((proc (syscall->procedure int "umount2" `(* ,int))))
(let-values (((ret err)
(proc (string->pointer target) flags)))
(unless (zero? ret)
(throw 'system-error "umount" "~S: ~A"
(list target (strerror err))
(list err)))
(when update-mtab?
(remove-from-mtab target)))))
(let ((proc (syscall->procedure int "umount2" `(* ,int)))) ;XXX
(lambda* (target #:optional (flags 0) #:key (update-mtab? #f))
"Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_*
constants from <sys/mount.h>."
(let-values (((ret err)
(proc (string->pointer target) flags)))
(unless (zero? ret)
(throw 'system-error "umount" "~S: ~A"
(list target (strerror err))
(list err)))
(when update-mtab?
(remove-from-mtab target))))))
;; Mount point information.
(define-record-type <mount>
@ -732,25 +732,27 @@ current process."
(define-as-needed RB_SW_SUSPEND #xd000fce2)
(define-as-needed RB_KEXEC #x45584543)
(define-as-needed (reboot #:optional (cmd RB_AUTOBOOT))
(define-as-needed reboot
(let ((proc (syscall->procedure int "reboot" (list int))))
(let-values (((ret err) (proc cmd)))
(unless (zero? ret)
(throw 'system-error "reboot" "~S: ~A"
(list cmd (strerror err))
(list err))))))
(lambda* (#:optional (cmd RB_AUTOBOOT))
(let-values (((ret err) (proc cmd)))
(unless (zero? ret)
(throw 'system-error "reboot" "~S: ~A"
(list cmd (strerror err))
(list err)))))))
(define-as-needed (load-linux-module data #:optional (options ""))
(define-as-needed load-linux-module
(let ((proc (syscall->procedure int "init_module"
(list '* unsigned-long '*))))
(let-values (((ret err)
(proc (bytevector->pointer data)
(bytevector-length data)
(string->pointer options))))
(unless (zero? ret)
(throw 'system-error "load-linux-module" "~A"
(list (strerror err))
(list err))))))
(lambda* (data #:optional (options ""))
(let-values (((ret err)
(proc (bytevector->pointer data)
(bytevector-length data)
(string->pointer options))))
(unless (zero? ret)
(throw 'system-error "load-linux-module" "~A"
(list (strerror err))
(list err)))))))
(define (kernel? pid)
"Return #t if PID designates a \"kernel thread\" rather than a normal