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syscalls: Add network-interface-running? 

* guix/build/syscalls.scm (network-interface-running?): New variable.
Export it.
* tests/syscalls.scm: Add test.

Co-authored-by: John Darrington <jmd@gnu.org>
This commit is contained in:
Danny Milosavljevic 2017-07-04 02:56:02 +02:00
parent 839ee8d547
commit 0bc6fe323d
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2 changed files with 19 additions and 0 deletions
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9
guix/build/syscalls.scm
View File

@ -92,6 +92,7 @@
all-network-interface-names all-network-interface-names
network-interface-names network-interface-names
network-interface-netmask network-interface-netmask
network-interface-running?
loopback-network-interface? loopback-network-interface?
network-interface-address network-interface-address
set-network-interface-netmask set-network-interface-netmask
@ -1156,6 +1157,7 @@ bytes."
(define-as-needed IFF_UP #x1) ;Interface is up (define-as-needed IFF_UP #x1) ;Interface is up
(define-as-needed IFF_BROADCAST #x2) ;Broadcast address valid. (define-as-needed IFF_BROADCAST #x2) ;Broadcast address valid.
(define-as-needed IFF_LOOPBACK #x8) ;Is a loopback net. (define-as-needed IFF_LOOPBACK #x8) ;Is a loopback net.
(define-as-needed IFF_RUNNING #x40) ;interface RFC2863 OPER_UP
(define IF_NAMESIZE 16) ;maximum interface name size (define IF_NAMESIZE 16) ;maximum interface name size
@ -1330,6 +1332,13 @@ interface NAME."
(close-port sock) (close-port sock)
(not (zero? (logand flags IFF_LOOPBACK))))) (not (zero? (logand flags IFF_LOOPBACK)))))
(define (network-interface-running? name)
"Return true if NAME designates a running network interface."
(let* ((sock (socket SOCK_STREAM AF_INET 0))
(flags (network-interface-flags sock name)))
(close-port sock)
(not (zero? (logand flags IFF_RUNNING)))))
(define-as-needed (set-network-interface-flags socket name flags) (define-as-needed (set-network-interface-flags socket name flags)
"Set the flag of network interface NAME to FLAGS." "Set the flag of network interface NAME to FLAGS."
(let ((req (make-bytevector ifreq-struct-size))) (let ((req (make-bytevector ifreq-struct-size)))

10
tests/syscalls.scm
View File

@ -361,6 +361,16 @@
(lambda args (lambda args
(system-error-errno args))))) (system-error-errno args)))))
(test-equal "loopback-network-interface-running?"
ENODEV
(and (network-interface-running? "lo")
(catch 'system-error
(lambda ()
(network-interface-running? "nonexistent")
#f)
(lambda args
(system-error-errno args)))))
(test-skip (if (zero? (getuid)) 1 0)) (test-skip (if (zero? (getuid)) 1 0))
(test-assert "set-network-interface-flags" (test-assert "set-network-interface-flags"
(let ((sock (socket AF_INET SOCK_STREAM 0))) (let ((sock (socket AF_INET SOCK_STREAM 0)))