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# mktmp.bash
# Author: Noah Friedman <friedman@prep.ai.mit.edu>
# Created: 1993-02-03
# Last modified: 1993-02-03
# Public domain
# Conversion to bash v2 syntax done by Chet Ramey
# Commentary:
# Code:
#:docstring mktmp:
# Usage: mktmp [template] {createp}
#
# Generate a unique filename from TEMPLATE by appending a random number to
# the end.
#
# If optional 2nd arg CREATEP is non-null, file will be created atomically
# before returning. This is to avoid the race condition that in between
# the time that the temporary name is returned and the caller uses it,
# someone else creates the file.
#:end docstring:
###;;;autoload
function mktmp ()
{
local template="$1"
local tmpfile="${template}${RANDOM}"
local createp="$2"
local noclobber_status
case "$-" in
*C*) noclobber_status=set;;
esac
if [ "${createp:+set}" = "set" ]; then
# Version which creates file atomically through noclobber test.
set -o noclobber
(> "${tmpfile}") 2> /dev/null
while [ $? -ne 0 ] ; do
# Detect whether file really exists or creation lost because of
# some other permissions problem. If the latter, we don't want
# to loop forever.
if [ ! -e "${tmpfile}" ]; then
# Trying to create file again creates stderr message.
echo -n "mktmp: " 1>&2
> "${tmpfile}"
return 1
fi
tmpfile="${template}${RANDOM}"
(> "${tmpfile}") 2> /dev/null
done
test "${noclobber_status}" != "set" && set +o noclobber
else
# Doesn't create file, so it introduces race condition for caller.
while [ -e "${tmpfile}" ]; do
tmpfile="${template}${RANDOM}"
done
fi
echo "${tmpfile}"
}
provide mktmp
# mktmp.bash ends here
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