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
|
|
@ -24,12 +24,12 @@
|
|||
#:use-module (srfi srfi-1)
|
||||
#:use-module (srfi srfi-9)
|
||||
#:use-module (srfi srfi-9 gnu)
|
||||
#:use-module (srfi srfi-11)
|
||||
#:use-module (ice-9 rdelim)
|
||||
#:use-module (ice-9 regex)
|
||||
#:use-module (ice-9 match)
|
||||
#:use-module (ice-9 ftw)
|
||||
#:export (errno
|
||||
MS_RDONLY
|
||||
#:export (MS_RDONLY
|
||||
MS_NOSUID
|
||||
MS_NODEV
|
||||
MS_NOEXEC
|
||||
|
|
@ -282,14 +282,14 @@ given TYPES. READ uses WRAP-FIELDS to return its value."
|
|||
;;;
|
||||
|
||||
(define %libc-errno-pointer
|
||||
;; Glibc's 'errno' pointer.
|
||||
;; Glibc's 'errno' pointer, for use with Guile < 2.0.12.
|
||||
(let ((errno-loc (false-if-exception
|
||||
(dynamic-func "__errno_location" (dynamic-link)))))
|
||||
(and errno-loc
|
||||
(let ((proc (pointer->procedure '* errno-loc '())))
|
||||
(proc)))))
|
||||
|
||||
(define errno
|
||||
(define errno ;for Guile < 2.0.12
|
||||
(if %libc-errno-pointer
|
||||
(let ((bv (pointer->bytevector %libc-errno-pointer (sizeof int))))
|
||||
(lambda ()
|
||||
|
|
@ -328,13 +328,26 @@ given TYPES. READ uses WRAP-FIELDS to return its value."
|
|||
(call-with-restart-on-EINTR (lambda () expr)))
|
||||
|
||||
(define (syscall->procedure return-type name argument-types)
|
||||
"Return a procedure that wraps the C function NAME using the dynamic FFI.
|
||||
"Return a procedure that wraps the C function NAME using the dynamic FFI,
|
||||
and that returns two values: NAME's return value, and errno.
|
||||
|
||||
If an error occurs while creating the binding, defer the error report until
|
||||
the returned procedure is called."
|
||||
(catch #t
|
||||
(lambda ()
|
||||
(let ((ptr (dynamic-func name (dynamic-link))))
|
||||
(pointer->procedure return-type ptr argument-types)))
|
||||
;; The #:return-errno? facility was introduced in Guile 2.0.12.
|
||||
;; Support older versions of Guile by catching 'wrong-number-of-args'.
|
||||
(catch 'wrong-number-of-args
|
||||
(lambda ()
|
||||
(pointer->procedure return-type ptr argument-types
|
||||
#:return-errno? #t))
|
||||
(lambda (key . rest)
|
||||
(let ((proc (pointer->procedure return-type ptr argument-types)))
|
||||
(lambda args
|
||||
(let ((result (apply proc args))
|
||||
(err (errno)))
|
||||
(values result err))))))))
|
||||
(lambda args
|
||||
(lambda _
|
||||
(error (format #f "~a: syscall->procedure failed: ~s"
|
||||
|
|
@ -401,18 +414,18 @@ 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 ((ret (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)))
|
||||
(err (errno)))
|
||||
(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))
|
||||
|
|
@ -426,8 +439,8 @@ error."
|
|||
#:key (update-mtab? #f))
|
||||
"Unmount TARGET. Optionally FLAGS may be one of the MNT_* or UMOUNT_*
|
||||
constants from <sys/mount.h>."
|
||||
(let ((ret (proc (string->pointer target) flags))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(proc (string->pointer target) flags)))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "umount" "~S: ~A"
|
||||
(list target (strerror err))
|
||||
|
|
@ -451,8 +464,8 @@ constants from <sys/mount.h>."
|
|||
(let ((proc (syscall->procedure int "swapon" (list '* int))))
|
||||
(lambda* (device #:optional (flags 0))
|
||||
"Use the block special device at DEVICE for swapping."
|
||||
(let ((ret (proc (string->pointer device) flags))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(proc (string->pointer device) flags)))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "swapon" "~S: ~A"
|
||||
(list device (strerror err))
|
||||
|
|
@ -462,8 +475,7 @@ constants from <sys/mount.h>."
|
|||
(let ((proc (syscall->procedure int "swapoff" '(*))))
|
||||
(lambda (device)
|
||||
"Stop using block special device DEVICE for swapping."
|
||||
(let ((ret (proc (string->pointer device)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err) (proc (string->pointer device))))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "swapoff" "~S: ~A"
|
||||
(list device (strerror err))
|
||||
|
|
@ -499,8 +511,7 @@ user-land process."
|
|||
(lambda (tmpl)
|
||||
"Create a new unique directory in the file system using the template
|
||||
string TMPL and return its file name. TMPL must end with 'XXXXXX'."
|
||||
(let ((result (proc (string->pointer tmpl)))
|
||||
(err (errno)))
|
||||
(let-values (((result err) (proc (string->pointer tmpl))))
|
||||
(when (null-pointer? result)
|
||||
(throw 'system-error "mkdtemp!" "~S: ~A"
|
||||
(list tmpl (strerror err))
|
||||
|
|
@ -513,9 +524,8 @@ string TMPL and return its file name. TMPL must end with 'XXXXXX'."
|
|||
"Flush buffered output of PORT, an output file port, and then call
|
||||
fdatasync(2) on the underlying file descriptor."
|
||||
(force-output port)
|
||||
(let* ((fd (fileno port))
|
||||
(ret (proc fd))
|
||||
(err (errno)))
|
||||
(let*-values (((fd) (fileno port))
|
||||
((ret err) (proc fd)))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "fdatasync" "~S: ~A"
|
||||
(list fd (strerror err))
|
||||
|
|
@ -566,9 +576,9 @@ fdatasync(2) on the underlying file descriptor."
|
|||
(lambda (file)
|
||||
"Return a <file-system> data structure describing the file system
|
||||
mounted at FILE."
|
||||
(let* ((stat (make-bytevector sizeof-statfs))
|
||||
(ret (proc (string->pointer file) (bytevector->pointer stat)))
|
||||
(err (errno)))
|
||||
(let*-values (((stat) (make-bytevector sizeof-statfs))
|
||||
((ret err) (proc (string->pointer file)
|
||||
(bytevector->pointer stat))))
|
||||
(if (zero? ret)
|
||||
(read-statfs stat)
|
||||
(throw 'system-error "statfs" "~A: ~A"
|
||||
|
|
@ -611,11 +621,11 @@ mounted at FILE."
|
|||
"Create a new child process by duplicating the current parent process.
|
||||
Unlike the fork system call, clone accepts FLAGS that specify which resources
|
||||
are shared between the parent and child processes."
|
||||
(let ((ret (proc syscall-id flags
|
||||
%null-pointer ;child stack
|
||||
%null-pointer %null-pointer ;ptid & ctid
|
||||
%null-pointer)) ;unused
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(proc syscall-id flags
|
||||
%null-pointer ;child stack
|
||||
%null-pointer %null-pointer ;ptid & ctid
|
||||
%null-pointer))) ;unused
|
||||
(if (= ret -1)
|
||||
(throw 'system-error "clone" "~d: ~A"
|
||||
(list flags (strerror err))
|
||||
|
|
@ -632,8 +642,7 @@ are shared between the parent and child processes."
|
|||
file descriptor obtained by opening a /proc/PID/ns/* file. NSTYPE specifies
|
||||
which type of namespace the current process may be reassociated with, or 0 if
|
||||
there is no such limitation."
|
||||
(let ((ret (proc fdes nstype))
|
||||
(err (errno)))
|
||||
(let-values (((ret err) (proc fdes nstype)))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "setns" "~d ~d: ~A"
|
||||
(list fdes nstype (strerror err))
|
||||
|
|
@ -644,9 +653,9 @@ there is no such limitation."
|
|||
(lambda (new-root put-old)
|
||||
"Change the root file system to NEW-ROOT and move the current root file
|
||||
system to PUT-OLD."
|
||||
(let ((ret (proc (string->pointer new-root)
|
||||
(string->pointer put-old)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(proc (string->pointer new-root)
|
||||
(string->pointer put-old))))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "pivot_root" "~S ~S: ~A"
|
||||
(list new-root put-old (strerror err))
|
||||
|
|
@ -717,12 +726,12 @@ exception if it's already taken."
|
|||
|
||||
;; XXX: 'fcntl' is a vararg function, but here we happily use the
|
||||
;; standard ABI; crossing fingers.
|
||||
(let ((ret (proc fd
|
||||
(if wait?
|
||||
F_SETLKW ; lock & wait
|
||||
F_SETLK) ; non-blocking attempt
|
||||
(bytevector->pointer bv)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(proc fd
|
||||
(if wait?
|
||||
F_SETLKW ;lock & wait
|
||||
F_SETLK) ;non-blocking attempt
|
||||
(bytevector->pointer bv))))
|
||||
(unless (zero? ret)
|
||||
;; Presumably we got EAGAIN or so.
|
||||
(throw 'flock-error err))))))
|
||||
|
|
@ -857,19 +866,19 @@ to interfaces that are currently up."
|
|||
(len (* ifreq-struct-size 10))
|
||||
(reqs (make-bytevector len))
|
||||
(conf (make-c-struct ifconf-struct
|
||||
(list len (bytevector->pointer reqs))))
|
||||
(ret (%ioctl (fileno sock) SIOCGIFCONF conf))
|
||||
(err (errno)))
|
||||
(when close?
|
||||
(close-port sock))
|
||||
(if (zero? ret)
|
||||
(bytevector->string-list reqs ifreq-struct-size
|
||||
(match (parse-c-struct conf ifconf-struct)
|
||||
((len . _) len)))
|
||||
(throw 'system-error "network-interface-list"
|
||||
"network-interface-list: ~A"
|
||||
(list (strerror err))
|
||||
(list err)))))
|
||||
(list len (bytevector->pointer reqs)))))
|
||||
(let-values (((ret err)
|
||||
(%ioctl (fileno sock) SIOCGIFCONF conf)))
|
||||
(when close?
|
||||
(close-port sock))
|
||||
(if (zero? ret)
|
||||
(bytevector->string-list reqs ifreq-struct-size
|
||||
(match (parse-c-struct conf ifconf-struct)
|
||||
((len . _) len)))
|
||||
(throw 'system-error "network-interface-list"
|
||||
"network-interface-list: ~A"
|
||||
(list (strerror err))
|
||||
(list err))))))
|
||||
|
||||
(define %interface-line
|
||||
;; Regexp matching an interface line in Linux's /proc/net/dev.
|
||||
|
|
@ -897,9 +906,9 @@ interface NAME."
|
|||
(let ((req (make-bytevector ifreq-struct-size)))
|
||||
(bytevector-copy! (string->utf8 name) 0 req 0
|
||||
(min (string-length name) (- IF_NAMESIZE 1)))
|
||||
(let* ((ret (%ioctl (fileno socket) SIOCGIFFLAGS
|
||||
(bytevector->pointer req)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(%ioctl (fileno socket) SIOCGIFFLAGS
|
||||
(bytevector->pointer req))))
|
||||
(if (zero? ret)
|
||||
|
||||
;; The 'ifr_flags' field is IF_NAMESIZE bytes after the beginning of
|
||||
|
|
@ -927,9 +936,9 @@ interface NAME."
|
|||
;; Set the 'ifr_flags' field.
|
||||
(bytevector-uint-set! req IF_NAMESIZE flags (native-endianness)
|
||||
(sizeof short))
|
||||
(let* ((ret (%ioctl (fileno socket) SIOCSIFFLAGS
|
||||
(bytevector->pointer req)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(%ioctl (fileno socket) SIOCSIFFLAGS
|
||||
(bytevector->pointer req))))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "set-network-interface-flags"
|
||||
"set-network-interface-flags on ~A: ~A"
|
||||
|
|
@ -943,9 +952,9 @@ interface NAME."
|
|||
(min (string-length name) (- IF_NAMESIZE 1)))
|
||||
;; Set the 'ifr_addr' field.
|
||||
(write-socket-address! sockaddr req IF_NAMESIZE)
|
||||
(let* ((ret (%ioctl (fileno socket) SIOCSIFADDR
|
||||
(bytevector->pointer req)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(%ioctl (fileno socket) SIOCSIFADDR
|
||||
(bytevector->pointer req))))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "set-network-interface-address"
|
||||
"set-network-interface-address on ~A: ~A"
|
||||
|
|
@ -958,9 +967,9 @@ the same type as that returned by 'make-socket-address'."
|
|||
(let ((req (make-bytevector ifreq-struct-size)))
|
||||
(bytevector-copy! (string->utf8 name) 0 req 0
|
||||
(min (string-length name) (- IF_NAMESIZE 1)))
|
||||
(let* ((ret (%ioctl (fileno socket) SIOCGIFADDR
|
||||
(bytevector->pointer req)))
|
||||
(err (errno)))
|
||||
(let-values (((ret err)
|
||||
(%ioctl (fileno socket) SIOCGIFADDR
|
||||
(bytevector->pointer req))))
|
||||
(if (zero? ret)
|
||||
(read-socket-address req IF_NAMESIZE)
|
||||
(throw 'system-error "network-interface-address"
|
||||
|
|
@ -1076,9 +1085,10 @@ return the list of resulting <interface> objects."
|
|||
(lambda ()
|
||||
"Return a list of <interface> objects, each denoting a configured
|
||||
network interface. This is implemented using the 'getifaddrs' libc function."
|
||||
(let* ((ptr (bytevector->pointer (make-bytevector (sizeof* '*))))
|
||||
(ret (proc ptr))
|
||||
(err (errno)))
|
||||
(let*-values (((ptr)
|
||||
(bytevector->pointer (make-bytevector (sizeof* '*))))
|
||||
((ret err)
|
||||
(proc ptr)))
|
||||
(if (zero? ret)
|
||||
(let* ((ptr (dereference-pointer ptr))
|
||||
(result (unfold-interface-list ptr)))
|
||||
|
|
@ -1181,9 +1191,8 @@ given an integer, returns the list of names of the constants that are or'd."
|
|||
(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)))
|
||||
(let*-values (((bv) (make-bytevector sizeof-termios))
|
||||
((ret err) (proc fd (bytevector->pointer bv))))
|
||||
(if (zero? ret)
|
||||
(read-termios bv)
|
||||
(throw 'system-error "tcgetattr" "~A"
|
||||
|
|
@ -1206,8 +1215,7 @@ produced by 'tcsetattr-action'; see tcsetattr(3) for details."
|
|||
(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)))
|
||||
(let-values (((ret err) (proc fd actions (bytevector->pointer bv))))
|
||||
(unless (zero? ret)
|
||||
(throw 'system-error "tcgetattr" "~A"
|
||||
(list (strerror err))
|
||||
|
|
@ -1238,10 +1246,9 @@ produced by 'tcsetattr-action'; see tcsetattr(3) for details."
|
|||
"Return a <window-size> structure describing the terminal at PORT, or raise
|
||||
a 'system-error' if PORT is not backed by a terminal. This procedure
|
||||
corresponds to the TIOCGWINSZ ioctl."
|
||||
(let* ((size (make-bytevector sizeof-winsize))
|
||||
(ret (%ioctl (fileno port) TIOCGWINSZ
|
||||
(bytevector->pointer size)))
|
||||
(err (errno)))
|
||||
(let*-values (((size) (make-bytevector sizeof-winsize))
|
||||
((ret err) (%ioctl (fileno port) TIOCGWINSZ
|
||||
(bytevector->pointer size))))
|
||||
(if (zero? ret)
|
||||
(read-winsize size)
|
||||
(throw 'system-error "terminal-window-size" "~A"
|
||||
|
|
|
|||
Loading…
Reference in New Issue