1#!/bin/sh
2# Tests for file descriptor exhaustion.
3
4# Copyright (C) 2009-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ sort
21
22# This script uses 'ulimit -n 7' to limit 'sort' to at most 7 open files:
23# stdin, stdout, stderr, two input and one output files when merging,
24# and an extra.  The extra is for old-fashioned platforms like Solaris 10
25# where opening a temp file also requires opening /dev/urandom to
26# calculate the temp file's name.
27
28# Skip the test when running under valgrind.
29( ulimit -n 7; sort 3<&- 4<&- 5<&- 6<&- < /dev/null ) \
30  || skip_ 'fd-limited sort failed; are you running under valgrind?'
31
32for i in $(seq 31); do
33  echo $i | tee -a in > __test.$i || framework_failure_
34done
35
36# glob before ulimit to avoid issues on bash 3.2 on OS X 10.6.8 at least
37test_files=$(echo __test.*)
38
39(
40 ulimit -n 7
41 sort -n -m $test_files 3<&- 4<&- 5<&- 6<&- < /dev/null > out
42) &&
43compare in out ||
44  { fail=1; echo 'file descriptor exhaustion not handled' 1>&2; }
45
46echo 32 | tee -a in > in1
47(
48 ulimit -n 7
49 sort -n -m $test_files - 3<&- 4<&- 5<&- 6<&- < in1 > out
50) &&
51compare in out || { fail=1; echo 'stdin not handled properly' 1>&2; }
52
53Exit $fail
54