Bug#34380: glibc-doc: info libc says open has O_SHLOCK, yet I cannot find it in /usr/include

[cesarb@web4u.com.br]

Package: glibc-doc
Version: 2.0.7.19981211-6

>From libc.info:
 - Macro: int O_SHLOCK
     Acquire a shared lock on the file, as with `flock'.  *Note File
     Locks::.

However, I cannot find O_SHLOCK in any include file. Looks like a documentation
bug (documenting a nonimplemented/misimplemented feature).

-- System Information
Debian Release: potato
Kernel Version: Linux cesarb2 2.2.3 #1 Tue Mar 9 14:28:14 EST 1999 i586 unknown