unistd.h: daemon

[Simon Josefsson]

Glibc has a 'daemon' function, which is from BSD, however it is not
documented in the glibc manual [1] and it is not in POSIX.  Mike noticed
that InetUtils is using it:

http://thread.gmane.org/gmane.comp.gnu.inetutils.bugs/3040/focus=3041

This begs the question of whether using the 'daemon' interface is a good
idea or not.  I see two approaches:

1) Regard the 'daemon' interface as broken, and let InetUtils call a
different function, e.g., 'daemonize', and implement it in InetUtils
(which already contains an implementation, so that is easy).

2) Consider the 'daemon' interface as working, and provide a gnulib
module for it so that it can be used interoperable.

Anyone with opinions on the 'daemon' interface?  Should we provide a
gnulib module for it?

/Simon

[1] http://sourceware.org/bugzilla/show_bug.cgi?id=12251