From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steve Graegert <graegerts@gmail.com>
Subject: Re: How does one get the description of an errno value
Date: Sun, 15 Mar 2009 14:10:21 +0100
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To: Tiago Maluta <maluta_tiago@yahoo.com.br>
Cc: Angel Tsankov <fn42551@fmi.uni-sofia.bg>, linux-c-programming@vger.kernel.org

Tiago,

You're correct.  MAX_ERRNO is a custom macro being defined elsewhere
and actually expands to to sys_nerr.  I picked that code from some
examples I've prepared some years ago.  Sorry for the inconvenience
but I think you get the idea.  see perror(3) for more info.

	\Steve

--

Steve Graegert
www.graegert.com



On Sun, Mar 15, 2009 at 11:43 AM, Tiago Maluta
<maluta_tiago@yahoo.com.br> wrote:
> Steve,
>
>> The following code snippet should do it. =A0It basically sets errno
>> manually and outputs the associated error message.
>>
>> --- BEGIN ---
>>
>> #define _ALL_SOURCE
>>
>> #include <stdio.h>
>> #include <errno.h> /* for _MAX_ERRNO */
>>
>
> I've searched in headers on /usr/include for MAX_ERRNO but not found.
> Where MAX_ERRNO is defined?
>
> A *very* simple workaround was check for "Unknown" word, so I tried:
>
> int main(void) {
> =A0 =A0 =A0 =A0int i=3D0;
> =A0 =A0 =A0 =A0extern int errno;
> =A0 =A0 =A0 =A0char str[128];
>
> =A0 =A0 =A0 =A0while (strncmp(str,"Unknown",7)) {
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0sprintf(str,"%s",strerror(i));
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0fprintf(stderr, "%3d", i);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0errno =3D i;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0perror(" ");
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0i++;
> =A0 =A0 =A0 =A0}
>
> =A0 =A0 =A0 =A0return (0);
> }
>
>
> But there is "Unknown" between valid error messages.
> I think there is a better way to do it....
>
>
> Best regards,
>
> --tm
>
>
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