mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2025-01-24 03:29:40 -05:00
syscalls: Use #:return-errno? when it is available.
* guix/build/syscalls.scm (errno): Do not export. (syscall->procedure): Change to return a procedure that returns both the value and errno. Use #:return-errno? where available. (mount, umount, swapon, swapoff, mkdtemp!, fdatasync, statfs) (clone, setns, pivot-root, fcntl-flock, network-interface-names) (network-interface-flags, set-network-interface-flags) (set-network-interface-address, network-interface-address): (network-interfaces, tcgetattr, tcsetattr, terminal-window-size): Adjust accordingly using 'let-values'.
This commit is contained in:
Ludovic Courtès
parent
fea1422e27
commit
26ffb69399
1 changed files with 92 additions and 85 deletions
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@ -24,12 +24,12 @@ (define-module (guix build syscalls)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-9 gnu)
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#:use-module (srfi srfi-11)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 match)
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#:use-module (ice-9 ftw)
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#:export (errno
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MS_RDONLY
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#:export (MS_RDONLY
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MS_NOSUID
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MS_NODEV
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MS_NOEXEC
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@ -282,14 +282,14 @@ (define* (read bv #:optional (offset 0))
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;;;
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(define %libc-errno-pointer
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;; Glibc's 'errno' pointer.
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;; Glibc's 'errno' pointer, for use with Guile < 2.0.12.
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(let ((errno-loc (false-if-exception
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(dynamic-func "__errno_location" (dynamic-link)))))
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(and errno-loc
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(let ((proc (pointer->procedure '* errno-loc '())))
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(proc)))))
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(define errno
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(define errno ;for Guile < 2.0.12
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(if %libc-errno-pointer
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(let ((bv (pointer->bytevector %libc-errno-pointer (sizeof int))))
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(lambda ()
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@ -328,13 +328,26 @@ (define-syntax-rule (restart-on-EINTR expr)
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(call-with-restart-on-EINTR (lambda () expr)))
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(define (syscall->procedure return-type name argument-types)
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"Return a procedure that wraps the C function NAME using the dynamic FFI.
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"Return a procedure that wraps the C function NAME using the dynamic FFI,
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and that returns two values: NAME's return value, and errno.
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If an error occurs while creating the binding, defer the error report until
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the returned procedure is called."
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(catch #t
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(lambda ()
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(let ((ptr (dynamic-func name (dynamic-link))))
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(pointer->procedure return-type ptr argument-types)))
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;; The #:return-errno? facility was introduced in Guile 2.0.12.
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;; Support older versions of Guile by catching 'wrong-number-of-args'.
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(catch 'wrong-number-of-args
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(lambda ()
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(pointer->procedure return-type ptr argument-types
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#:return-errno? #t))
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(lambda (key . rest)
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(let ((proc (pointer->procedure return-type ptr argument-types)))
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(lambda args
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(let ((result (apply proc args))
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(err (errno)))
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(values result err))))))))
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(lambda args
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(lambda _
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(error (format #f "~a: syscall->procedure failed: ~s"
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@ -401,18 +414,18 @@ (define mount
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string. When FLAGS contains MS_REMOUNT, SOURCE and TYPE are ignored. When
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UPDATE-MTAB? is true, update /etc/mtab. Raise a 'system-error' exception on
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error."
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(let ((ret (proc (if source
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(string->pointer source)
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%null-pointer)
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(string->pointer target)
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(if type
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(string->pointer type)
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%null-pointer)
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flags
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(if options
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(string->pointer options)
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%null-pointer)))
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(err (errno)))
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(let-values (((ret err)
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(proc (if source
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(string->pointer source)
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%null-pointer)
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(string->pointer target)
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(if type
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(string->pointer type)
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%null-pointer)
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flags
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(if options
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(string->pointer options)
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%null-pointer))))
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(unless (zero? ret)
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(throw 'system-error "mount" "mount ~S on ~S: ~A"
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(list source target (strerror err))
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@ -426,8 +439,8 @@ (define umount
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#:key (update-mtab? #f))
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"Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_*
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constants from <sys/mount.h>."
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(let ((ret (proc (string->pointer target) flags))
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(err (errno)))
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(let-values (((ret err)
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(proc (string->pointer target) flags)))
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(unless (zero? ret)
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(throw 'system-error "umount" "~S: ~A"
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(list target (strerror err))
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@ -451,8 +464,8 @@ (define swapon
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(let ((proc (syscall->procedure int "swapon" (list '* int))))
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(lambda* (device #:optional (flags 0))
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"Use the block special device at DEVICE for swapping."
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(let ((ret (proc (string->pointer device) flags))
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(err (errno)))
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(let-values (((ret err)
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(proc (string->pointer device) flags)))
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(unless (zero? ret)
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(throw 'system-error "swapon" "~S: ~A"
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(list device (strerror err))
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@ -462,8 +475,7 @@ (define swapoff
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(let ((proc (syscall->procedure int "swapoff" '(*))))
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(lambda (device)
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"Stop using block special device DEVICE for swapping."
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(let ((ret (proc (string->pointer device)))
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(err (errno)))
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(let-values (((ret err) (proc (string->pointer device))))
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(unless (zero? ret)
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(throw 'system-error "swapoff" "~S: ~A"
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(list device (strerror err))
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@ -499,8 +511,7 @@ (define mkdtemp!
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(lambda (tmpl)
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"Create a new unique directory in the file system using the template
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string TMPL and return its file name. TMPL must end with 'XXXXXX'."
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(let ((result (proc (string->pointer tmpl)))
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(err (errno)))
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(let-values (((result err) (proc (string->pointer tmpl))))
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(when (null-pointer? result)
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(throw 'system-error "mkdtemp!" "~S: ~A"
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(list tmpl (strerror err))
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@ -513,9 +524,8 @@ (define fdatasync
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"Flush buffered output of PORT, an output file port, and then call
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fdatasync(2) on the underlying file descriptor."
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(force-output port)
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(let* ((fd (fileno port))
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(ret (proc fd))
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(err (errno)))
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(let*-values (((fd) (fileno port))
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((ret err) (proc fd)))
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(unless (zero? ret)
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(throw 'system-error "fdatasync" "~S: ~A"
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(list fd (strerror err))
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@ -566,9 +576,9 @@ (define statfs
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(lambda (file)
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"Return a <file-system> data structure describing the file system
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mounted at FILE."
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(let* ((stat (make-bytevector sizeof-statfs))
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(ret (proc (string->pointer file) (bytevector->pointer stat)))
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(err (errno)))
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(let*-values (((stat) (make-bytevector sizeof-statfs))
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((ret err) (proc (string->pointer file)
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(bytevector->pointer stat))))
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(if (zero? ret)
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(read-statfs stat)
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(throw 'system-error "statfs" "~A: ~A"
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@ -611,11 +621,11 @@ (define clone
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"Create a new child process by duplicating the current parent process.
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Unlike the fork system call, clone accepts FLAGS that specify which resources
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are shared between the parent and child processes."
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(let ((ret (proc syscall-id flags
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%null-pointer ;child stack
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%null-pointer %null-pointer ;ptid & ctid
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%null-pointer)) ;unused
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(err (errno)))
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(let-values (((ret err)
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(proc syscall-id flags
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%null-pointer ;child stack
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%null-pointer %null-pointer ;ptid & ctid
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%null-pointer))) ;unused
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(if (= ret -1)
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(throw 'system-error "clone" "~d: ~A"
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(list flags (strerror err))
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@ -632,8 +642,7 @@ (define setns
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file descriptor obtained by opening a /proc/PID/ns/* file. NSTYPE specifies
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which type of namespace the current process may be reassociated with, or 0 if
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there is no such limitation."
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(let ((ret (proc fdes nstype))
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(err (errno)))
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(let-values (((ret err) (proc fdes nstype)))
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(unless (zero? ret)
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(throw 'system-error "setns" "~d ~d: ~A"
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(list fdes nstype (strerror err))
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@ -644,9 +653,9 @@ (define pivot-root
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(lambda (new-root put-old)
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"Change the root file system to NEW-ROOT and move the current root file
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system to PUT-OLD."
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(let ((ret (proc (string->pointer new-root)
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(string->pointer put-old)))
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(err (errno)))
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(let-values (((ret err)
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(proc (string->pointer new-root)
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(string->pointer put-old))))
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(unless (zero? ret)
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(throw 'system-error "pivot_root" "~S ~S: ~A"
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(list new-root put-old (strerror err))
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@ -717,12 +726,12 @@ (define bv
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;; XXX: 'fcntl' is a vararg function, but here we happily use the
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;; standard ABI; crossing fingers.
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(let ((ret (proc fd
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(if wait?
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F_SETLKW ; lock & wait
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F_SETLK) ; non-blocking attempt
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(bytevector->pointer bv)))
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(err (errno)))
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(let-values (((ret err)
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(proc fd
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(if wait?
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F_SETLKW ;lock & wait
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F_SETLK) ;non-blocking attempt
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(bytevector->pointer bv))))
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(unless (zero? ret)
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;; Presumably we got EAGAIN or so.
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(throw 'flock-error err))))))
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@ -857,19 +866,19 @@ (define* (network-interface-names #:optional sock)
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(len (* ifreq-struct-size 10))
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(reqs (make-bytevector len))
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(conf (make-c-struct ifconf-struct
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(list len (bytevector->pointer reqs))))
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(ret (%ioctl (fileno sock) SIOCGIFCONF conf))
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(err (errno)))
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(when close?
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(close-port sock))
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(if (zero? ret)
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(bytevector->string-list reqs ifreq-struct-size
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(match (parse-c-struct conf ifconf-struct)
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((len . _) len)))
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(throw 'system-error "network-interface-list"
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"network-interface-list: ~A"
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(list (strerror err))
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(list err)))))
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(list len (bytevector->pointer reqs)))))
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(let-values (((ret err)
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(%ioctl (fileno sock) SIOCGIFCONF conf)))
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(when close?
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(close-port sock))
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(if (zero? ret)
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(bytevector->string-list reqs ifreq-struct-size
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(match (parse-c-struct conf ifconf-struct)
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((len . _) len)))
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(throw 'system-error "network-interface-list"
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"network-interface-list: ~A"
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(list (strerror err))
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(list err))))))
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(define %interface-line
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;; Regexp matching an interface line in Linux's /proc/net/dev.
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@ -897,9 +906,9 @@ (define (network-interface-flags socket name)
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(let ((req (make-bytevector ifreq-struct-size)))
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(bytevector-copy! (string->utf8 name) 0 req 0
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(min (string-length name) (- IF_NAMESIZE 1)))
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(let* ((ret (%ioctl (fileno socket) SIOCGIFFLAGS
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(bytevector->pointer req)))
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(err (errno)))
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(let-values (((ret err)
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(%ioctl (fileno socket) SIOCGIFFLAGS
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(bytevector->pointer req))))
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(if (zero? ret)
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;; The 'ifr_flags' field is IF_NAMESIZE bytes after the beginning of
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@ -927,9 +936,9 @@ (define (set-network-interface-flags socket name flags)
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;; Set the 'ifr_flags' field.
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(bytevector-uint-set! req IF_NAMESIZE flags (native-endianness)
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(sizeof short))
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(let* ((ret (%ioctl (fileno socket) SIOCSIFFLAGS
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(bytevector->pointer req)))
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(err (errno)))
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(let-values (((ret err)
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(%ioctl (fileno socket) SIOCSIFFLAGS
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(bytevector->pointer req))))
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(unless (zero? ret)
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(throw 'system-error "set-network-interface-flags"
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"set-network-interface-flags on ~A: ~A"
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@ -943,9 +952,9 @@ (define (set-network-interface-address socket name sockaddr)
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(min (string-length name) (- IF_NAMESIZE 1)))
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;; Set the 'ifr_addr' field.
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(write-socket-address! sockaddr req IF_NAMESIZE)
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(let* ((ret (%ioctl (fileno socket) SIOCSIFADDR
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(bytevector->pointer req)))
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(err (errno)))
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(let-values (((ret err)
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(%ioctl (fileno socket) SIOCSIFADDR
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(bytevector->pointer req))))
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(unless (zero? ret)
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(throw 'system-error "set-network-interface-address"
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"set-network-interface-address on ~A: ~A"
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@ -958,9 +967,9 @@ (define (network-interface-address socket name)
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(let ((req (make-bytevector ifreq-struct-size)))
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(bytevector-copy! (string->utf8 name) 0 req 0
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(min (string-length name) (- IF_NAMESIZE 1)))
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(let* ((ret (%ioctl (fileno socket) SIOCGIFADDR
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(bytevector->pointer req)))
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(err (errno)))
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(let-values (((ret err)
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(%ioctl (fileno socket) SIOCGIFADDR
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(bytevector->pointer req))))
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(if (zero? ret)
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(read-socket-address req IF_NAMESIZE)
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(throw 'system-error "network-interface-address"
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@ -1076,9 +1085,10 @@ (define network-interfaces
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(lambda ()
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"Return a list of <interface> objects, each denoting a configured
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network interface. This is implemented using the 'getifaddrs' libc function."
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(let* ((ptr (bytevector->pointer (make-bytevector (sizeof* '*))))
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(ret (proc ptr))
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(err (errno)))
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(let*-values (((ptr)
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(bytevector->pointer (make-bytevector (sizeof* '*))))
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((ret err)
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(proc ptr)))
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(if (zero? ret)
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(let* ((ptr (dereference-pointer ptr))
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(result (unfold-interface-list ptr)))
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@ -1181,9 +1191,8 @@ (define tcgetattr
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(let ((proc (syscall->procedure int "tcgetattr" (list int '*))))
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(lambda (fd)
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"Return the <termios> structure for the tty at FD."
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(let* ((bv (make-bytevector sizeof-termios))
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(ret (proc fd (bytevector->pointer bv)))
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(err (errno)))
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(let*-values (((bv) (make-bytevector sizeof-termios))
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((ret err) (proc fd (bytevector->pointer bv))))
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(if (zero? ret)
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(read-termios bv)
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(throw 'system-error "tcgetattr" "~A"
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@ -1206,8 +1215,7 @@ (define bv
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(match/write input-flags output-flags control-flags local-flags
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line-discipline control-chars input-speed output-speed))
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(let ((ret (proc fd actions (bytevector->pointer bv)))
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(err (errno)))
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(let-values (((ret err) (proc fd actions (bytevector->pointer bv))))
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(unless (zero? ret)
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(throw 'system-error "tcgetattr" "~A"
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(list (strerror err))
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@ -1238,10 +1246,9 @@ (define* (terminal-window-size #:optional (port (current-output-port)))
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"Return a <window-size> structure describing the terminal at PORT, or raise
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a 'system-error' if PORT is not backed by a terminal. This procedure
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corresponds to the TIOCGWINSZ ioctl."
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(let* ((size (make-bytevector sizeof-winsize))
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(ret (%ioctl (fileno port) TIOCGWINSZ
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(bytevector->pointer size)))
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(err (errno)))
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(let*-values (((size) (make-bytevector sizeof-winsize))
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((ret err) (%ioctl (fileno port) TIOCGWINSZ
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(bytevector->pointer size))))
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(if (zero? ret)
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(read-winsize size)
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(throw 'system-error "terminal-window-size" "~A"
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