Thanks to both of you (Joe and Malcom Smith).
I just found the answer at declaresub.com. You use the following
declare, which gets you a pointer to errno, which you then use as a
memoryblock to get the error code.
soft declare function libcErrorCode lib LibraryPath alias
"__errno_location" () as Ptr
The site also has a nice function for getting the messages using
strerror.
Paul Dobbs
Software Engineer, Staff
Lockheed Martin Missiles and Fire Control
Phone (972) 603-1244
Fax (972) 603-2017
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
[EMAIL PROTECTED]
Sent: Tuesday, March 06, 2007 2:37 PM
To: [email protected]
Subject: Re: errno
On Mar 06, 2007, at 20:09 UTC, Dobbs, Paul wrote:
> I'm trying to call a unix function (shmget) from RB. I seem to have
> gotten the declare right, or at least partly right, but I'm getting a
> return value of -1, which is an error. The error number is supposed to
> be in errno. How do I get errno and find out what the error is?
errno is a global variable and not something you can access directly in
RB, but you can declare to the perror() subroutine, which will read
errno and stuff a description of its meaning into the string you give
it. (See "man perror" for details.)
Best,
- Joe
--
Joe Strout -- [EMAIL PROTECTED]
Verified Express, LLC "Making the Internet a Better Place"
http://www.verex.com/
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