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doc system-error-errno
From: |
Kevin Ryde |
Subject: |
doc system-error-errno |
Date: |
Wed, 28 Jul 2004 11:08:04 +1000 |
User-agent: |
Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux) |
A tweak to the wording at the end of the posix "Conventions" node,
using @defun for system-error-errno instead of just describing it in
words.
Errors which the C library would report by returning a null pointer
or through some other means are reported by raising a `system-error'
exception. The parameters to this exception are the function name (a
string), a message format string and argument list, and the Unix
`errno' variable (an integer).
(define (my-handler key func fmt fmtargs errno)
...)
(catch 'system-error
(lambda () ...)
my-handler)
-- Function: system-error-errno arglist
Return the `errno' value exception arguments, or `#f' if not
available (if not a `system-error' exception).
(catch
'system-error
(lambda ()
(mkdir "/this-ought-to-fail-if-I'm-not-root"))
(lambda stuff
(let ((errno (system-error-errno stuff)))
(cond
((= errno EACCES)
(display "You're not allowed to do that."))
((= errno EEXIST)
(display "Already exists."))
(#t
(display (strerror errno))))
(newline))))
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