On 06/02/2012 12:54 PM, Mike Frysinger wrote:
> # @FUNCTION: redirect_alloc_fd
> # @USAGE: <var> <file> [redirection]
> # @DESCRIPTION:
> # Find a free fd and redirect the specified file via it. Store the new
> # fd in the specified variable. Useful for the cases where we don't care
> # about the exact fd #.
> redirect_alloc_fd() {
> local var=$1 file=$2 redir=${3:-"<>"}
>
> if [[ $(( (BASH_VERSINFO[0] << 8) + BASH_VERSINFO[1] )) -ge $(( (4 <<
> 8) + 1 )) ]] ; then
> # Newer bash provides this functionality.
> eval "exec {${var}}${redir}'${file}'"
> else
> # Need to provide the functionality ourselves.
> local fd=10
> while :; do
> if [[ ! -L /dev/fd/${fd} ]] ; then
> eval "exec ${fd}${redir}'${file}'" && break
> fi
> [[ ${fd} -gt 1024 ]] && return 1 # sanity
> : $(( ++fd ))
> done
> : $(( ${var} = fd ))
> fi
> }
I launched up a GhostBSD livedvd to see what /dev/fd/ looks like on
FreeBSD, and it seems to contain plain character devices instead of
symlinks to character devices:
[ghostbsd@livecd ~]$ uname -a
FreeBSD livecd 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Sun Jan 15 17:17:43
AST 2012
r...@ericbsd.ghostbsd.org:/usr/obj/i386.i386/usr/src/sys/GHOSTBSD i386
[ghostbsd@livecd ~]$ ls -l /dev/fd/
total 0
crw-rw-rw- 1 root wheel 0, 19 Jun 2 20:15 0
crw-rw-rw- 1 root wheel 0, 21 Jun 2 20:15 1
crw-rw-rw- 1 root wheel 0, 23 Jun 2 20:15 2
--
Thanks,
Zac
