Hal Murray via devel writes:
>> I see no changes related to _XOPEN_SOURCE since 2017. Perhaps you're
>> thinking of GPSD, where there was bunch of rework in that area just before
>> the 3.19 release.
>
> Thanks. You are probably right.
>
> Eric: This area just got more complicated. See #614
> strerror_r() has two modes depending on
> The XSI-compliant version is provided if:
> (_POSIX_C_SOURCE >= 200112L) && ! _GNU_SOURCE
> Otherwise, the GNU-specific version is provided.
Then don't define _GNU_SOURCE, the _POSIX_C_SOURCE should already be at
a high enough level on any halfway modern Linux system. Please note
that glibc until version 2.13 did not in fact provide a POSIX compliant
version.
> Our code is (sometimes?) assuming the wrong one. The GNU version
> (sometimes?)
> doesn't put the string into the buffer we are printing.
"The GNU-specific strerror_r() returns a pointer to a string containing
the error message. This may be either a pointer to a string that the
function stores in buf, or a pointer to some (immutable) static string
(in which case buf is unused). If the function stores a string in buf,
then at most buflen bytes are stored (the string may be truncated if
buflen is too small and errnum is unknown). The string always includes
a terminating null byte ('\0')."
Regards,
Achim.
--
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