long-options: add parse_gnu_standard_options_only Discussed in https://bugs.gnu.org/33468 . * lib/long-options.c (parse_long_options): Use EXIT_SUCCESS instead of 0. (parse_gnu_standard_options_only): Add function to process the GNU default options --help and --version and fail for any other unknown long or short option. See https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html . * lib/long-options.h (parse_gnu_standard_options_only): Declare it. * modules/long-options (depends-on): Add stdbool, exitfail. * top/maint.mk (sc_prohibit_long_options_without_use): Update syntax-check rule, add new function name.

#!/bin/sh

# Test with all of stdin, stdout, stderr open.
./test-xstdopen || exit 1

# The syntax for closed file descriptors in sh scripts is specified by POSIX in
# section 2.7.5 of
# http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html

# Test with stdin closed.
./test-xstdopen <&- || exit 1

# Test with stdout closed.
./test-xstdopen >&- || exit 1

# Test with stderr closed.
./test-xstdopen 2>&- || exit 1

# Test with all of stdin, stdout, stderr closed.
./test-xstdopen <&- >&- 2>&- || exit 1