Re: _GNU_SOURCE

Jeroen Ruigrok/asmodai wrote:
> -On [20030928 17:52], Tom Lane (tgl(at)sss(dot)pgh(dot)pa(dot)us) wrote:
> >Hm. So is crypt_r() a GNU extension? I would've thought it was
> >specified by some standard or other. Perhaps the real issue here
> >is that /usr/include/crypt.h is using the wrong control symbol.
> >At least in RHL 8.0, it definitely uses __USE_GNU to hide crypt_r
> >and the associated struct type.
>
> crypt() is a 4.3 BSD, SVID 3, Unix 95, Unix 98.
>
> crypt_r() though, is a GNU extension:
> http://lists.debian.org/lsb-discuss/2001/lsb-discuss-200103/msg00026.html
> and from:
> http://docs.mandragor.org/files/Programming_languages/C/glibc-2.2.3/libc_32.html#SEC661
>
> "The crypt_r function is a GNU extension."

BSD/OS doesn't have crypt_r(), and crypt() manual page says:

The crypt() function may not be safely called concurrently from multiple
threads, e.g., the interfaces described by pthreads(3).

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