Date: Wed, 4 Jul 2007 20:27:49 -0400 From: "Ighighi Ighighi" <ighighi@gmail.com> To: freebsd-hackers@freebsd.org Subject: add closefrom() call Message-ID: <de5dfb5a0707041727j3e3518f9l5a019717a9f90aa@mail.gmail.com>
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The closefrom() call, available in Solaris, is present in NetBSD since
version 3.0.
It is implemented with the F_CLOSEM fcntl() available since version 2.0.
These 2 fcntl would be cool to have in FreeBSD:
F_CLOSEM Close all file descriptors greater than or equal to fd.
F_MAXFD Return the maximum file descriptor number currently open by
the process.
I know that by using kern.file sysctl I could implement both, but it'd
be nice if the whole
closefrom() is done in kernel space. Another problem with using
kern.file is that
"struct xfile" may change...
By checking
http://fxr.watson.org/fxr/ident?v=NETBSD4;i=F_MAXFD
I see that it's fairly straightforward to add the F_MAXFD bit. For
the F_CLOSEM fcntl,
which call is the best to replace the fdrelease() used by NetBSD in
kern/kern_descrip.c ?
Can someone add these to FreeBSD ?
NetBSD's fcntl(2):
http://www.freebsd.org/cgi/man.cgi?query=fcntl&apropos=0&sektion=0&manpath=NetBSD+3.0&format=html
NetBSD's & Solaris' closefrom(3):
http://www.freebsd.org/cgi/man.cgi?query=closefrom&apropos=0&sektion=0&manpath=NetBSD+3.0&format=html
http://www.freebsd.org/cgi/man.cgi?query=closefrom&apropos=0&sektion=0&manpath=SunOS+5.9&format=html
Cheers,
Igh.
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