sys/param.h not checked for by configure

[John E. Malmberg]

Hello all,

The header file sys/param.h is not checked for by configure and is not 
provided by the VMS environment.

I have worked around this issue by having the VMS specific build script 
create an empty substitute file.

The HP VMS Engineering team has indicated a willingness to add the 
sys/param.h file to the operating system in a future release or patch 
kit, but has a problem.

There does not seem to be a standards document as to what exactly should 
be in this header file.

The sys/param.h header file is mentioned at The Open Group web site as 
existing in some implementations, but I can not find any definition for it.

http://pubs.opengroup.org/onlinepubs/009604599/basedefs/sys/stat.h.html 
is the reference.

The Linux System Base navigator shows it as defining two macros for 
constants by name.  I can not find in the Linux system Base definition 
explorer any description about what those two macros represent in a 
conforming implementation.  It also does not mention the constant value 
that The Open Group link states could be in that file.

http://www.linuxbase.org/navigator/browse/header.php?cmd=display&Hid=112

Falling back to a search on general usage gives some views on the two 
constants of MAXPATHLEN and NOFILE, as being for the maximum size of a 
file specification and the number of open files, but no references to a 
standards organization.

It did find one post that claimed that the Linux value of 4096 for 
MAXPATHLEN was wrong, and that it was easy to create longer paths.

For current VMS versions, MAXPATHLEN is 4096 and NOFILE is 65535.  The 
actual limit on files is usually set by a quota to that can be retrieved 
by getdtablesize() and is typically only a few thousand at most, so the 
NOFILE value is not that useful.

MAXPATHLEN appears to be a duplicate for the macros PATH_MAX and 
FILENAME_MAX that are defined in other standard headers.

So does anyone know of a link to a reference standard about what should 
be in the sys/param.h file.

Regards,
-John
wb8tyw@qsl.network
Personal Opinion Only