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To: cygwin@cygwin.com
From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>
Subject: Re: Issues in utmp/utmpx headers
Date: Tue, 29 Dec 2015 05:16:17 +0000 (UTC)
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> > David Lee <mailtolky <at> gmail.com> writes:
> >> While trying to port bsdgames to Cygwin I spotted the following issues:
> >> (1) In /usr/include/utmpx.h, utmpxname() is declared a void function.
> >> Should it return int?
> >> (2) In /usr/include/sys/utmp.h, utmpname() is declared a void
> >> function. Should it return int?
> >> (3) _PATH_UTMPX is not defined in any system headers.

> On 28 December 2015 at 03:02, Brian Inglis
> <Brian.Inglis <at> systematicsw.ab.ca> wrote:
> > Search packages for missing files e.g.
> > https://cygwin.com/cgi-bin2/package-grep.cgi?grep=utmp.h&arch=x86_64
> > brings up package cygwin-devel and cygwin32.
> > Download and run setup and select cygwin-devel to install the headers and
> > libraries.

David Lee <mailtolky <at> gmail.com> writes:
> The issue isn't missing, not-installed packages. The issues are (1)
> some function declaration seem wrong; and (2) a constant is missing.

Pardon my reading comprehension bork! 

The utmpname implementation in newlib-cygwin/winsup/cygwin/syscalls.cc
could probably be improved to: avoid a memory leak; return -1 if 
strdup fails, zero otherwise; default the path if a null pointer or string
argument is passed. 
That would also fix utmpxname which is an alias.
Such a change would have little likely impact on downstream apps, but could
produce warnings about ignoring return values. 

Unfortunately there appears to be no standard defined names to access the
default file name although GNU and Cygwin provide UTMP_FILE and UTMPX_FILE;
GNU also provide UTMP_FILENAME and UTMPX_FILENAME. 
_PATH_UTMP and _PATH_UTMPX are implementation reserved names which may or
may not be provided, though adding the latter in paths.h would be trivial. 

As the developers say, patches always welcome. 



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