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syscalls: setns: Skip binding if there is no such C function. 

On systems with a glibc prior to 2.14, the 'setns' function is not available.

Thanks to Eric Bavier for reporting the issue.

* guix/build/syscalls.scm (setns): Wrap with 'false-if-exception'.
master
David Thompson 2015-08-16 08:08:34 -04:00
parent 12a9f4af01
commit 39e336b5c8
1 changed files with 13 additions and 10 deletions
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23
guix/build/syscalls.scm
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@ -328,19 +328,22 @@ are shared between the parent and child processes."
(proc syscall-id flags %null-pointer))))
(define setns
(let* ((ptr (dynamic-func "setns" (dynamic-link)))
(proc (pointer->procedure int ptr (list int int))))
(lambda (fdes nstype)
"Reassociate the current process with the namespace specified by FDES, a
;; Some systems may be using an old (pre-2.14) version of glibc where there
;; is no 'setns' function available.
(false-if-exception
(let* ((ptr (dynamic-func "setns" (dynamic-link)))
(proc (pointer->procedure int ptr (list int int))))
(lambda (fdes nstype)
"Reassociate the current process with the namespace specified by FDES, a
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)))
(unless (zero? ret)
(throw 'system-error "setns" "~d ~d: ~A"
(list fdes nstype (strerror err))
(list err)))))))
(let ((ret (proc fdes nstype))
(err (errno)))
(unless (zero? ret)
(throw 'system-error "setns" "~d ~d: ~A"
(list fdes nstype (strerror err))
(list err))))))))
(define pivot-root
(let* ((ptr (dynamic-func "pivot_root" (dynamic-link)))