usr.bin/getconf: add some initial tests

Items tested via this commit are:
- Some basic POSIX constants.
- Some valid programming environments with -v.
- Some invalid programming environments via -v.

NOTE: this test makes assumptions about ILP32/LP32 vs LP64 that are
currently not true on all architectures to avoid hardcoding some
architectures in the tests. I'm working on improving getconf(1) to be
more sane about handling ILP32/LP32 vs LP64. Future commits are coming
soon to address this.

MFC after:	2 weeks
Tested with:	amd64, i386
Sponsored by:	Dell EMC Isilon

etc/mtree/BSD.tests.dist

@@ -622,6 +622,8 @@
         ..
         file2c
         ..
+        getconf
+        ..
         grep
         ..
         gzip

usr.bin/getconf/Makefile

@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 PROG=	getconf
 
 SRCS=	confstr.c getconf.c limits.c pathconf.c progenv.c sysconf.c
@@ -35,4 +37,8 @@ conflicting.names:	confstr.names limits.names sysconf.names
 unique.names:		conflicting.names
 	LC_ALL=C sort -u ${.ALLSRC} >${.TARGET}
 
+.if ${MK_TESTS} != "no"
+SUBDIR+=	tests
+.endif
+
 .include <bsd.prog.mk>

usr.bin/getconf/getconf.h

@@ -36,8 +36,15 @@ typedef long long intmax_t;
 #include <inttypes.h>
 #endif
 
+typedef enum {
+	PROG_ENV_VALID_NO_ALT_PATH = -1,
+	PROG_ENV_INVALID = 0,
+	PROG_ENV_VALID_HAS_ALT_PATH = 1,
+	PROG_ENV_UNKNOWN = 2,
+} prog_env_validity;
+
 int	find_confstr(const char *name, int *key);
 int	find_limit(const char *name, intmax_t *value);
 int	find_pathconf(const char *name, int *key);
-int	find_progenv(const char *name, const char **alt_path);
+prog_env_validity	find_progenv(const char *name, const char **alt_path);
 int	find_sysconf(const char *name, int *key);

usr.bin/getconf/tests/Makefile

@@ -0,0 +1,11 @@
+# $FreeBSD$
+
+ATF_TESTS_SH+=	getconf_test
+
+PROGS+=		arch_type
+
+BINDIR=		${TESTSDIR}
+
+WARNS?=		6
+
+.include <bsd.test.mk>

usr.bin/getconf/tests/arch_type.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017 Ngie Cooper <ngie@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$FreeBSD$");
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int
+main(void)
+{
+	bool known_arch_type;
+
+	known_arch_type = false;
+#ifdef	__LP64__
+	printf("LP64\n");
+	known_arch_type = true;
+#endif
+#ifdef	__LP32__
+	printf("LP32\n");
+	known_arch_type = true;
+#endif
+#ifdef	__ILP32__
+	printf("ILP32\n");
+	known_arch_type = true;
+#endif
+
+	if (known_arch_type)
+		exit(0);
+
+	fprintf(stderr, "unknown architecture type detected\n");
+	assert(0);
+}

usr.bin/getconf/tests/getconf_test.sh

@@ -0,0 +1,120 @@
+#
+# Copyright (c) 2017 Dell EMC
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+
+POSITIVE_EXP_EXPR_RE='match:[1-9][0-9]*'
+
+POSIX_CONSTANTS="ARG_MAX PAGESIZE"
+POSIX_PATH_CONSTANTS="NAME_MAX PATH_MAX"
+SUPPORTED_32BIT_PROGRAM_ENVS="POSIX_V6_ILP32_OFFBIG"
+SUPPORTED_64BIT_PROGRAM_ENVS="POSIX_V6_LP64_OFF64"
+UNAVAILABLE_PROGRAM_ENVS="I_AM_BOGUS"
+UNSUPPORTED_32BIT_PROGRAM_ENVS="POSIX_V6_LP64_OFF64"
+UNSUPPORTED_64BIT_PROGRAM_ENVS="POSIX_V6_ILP32_OFFBIG"
+
+XOPEN_CONSTANTS=
+
+# XXX: hardcoded sysexits
+EX_USAGE=64
+EX_UNAVAILABLE=69
+
+set_program_environments()
+{
+	atf_check -o save:arch_type.out $(atf_get_srcdir)/arch_type
+	arch_type=$(cat arch_type.out)
+	case "$arch_type" in
+	ILP32|LP32)
+		SUPPORTED_PROGRAM_ENVS="$SUPPORTED_PROGRAM_ENVS $SUPPORTED_32BIT_PROGRAM_ENVS"
+		UNSUPPORTED_PROGRAM_ENVS="$UNSUPPORTED_PROGRAM_ENVS $UNSUPPORTED_32BIT_PROGRAM_ENVS"
+		;;
+	LP64)
+		SUPPORTED_PROGRAM_ENVS="$SUPPORTED_PROGRAM_ENVS $SUPPORTED_64BIT_PROGRAM_ENVS"
+		UNSUPPORTED_PROGRAM_ENVS="$UNSUPPORTED_PROGRAM_ENVS $UNSUPPORTED_64BIT_PROGRAM_ENVS"
+		;;
+	*)
+		atf_fail "arch_type output unexpected: $arch_type"
+		;;
+	esac
+}
+
+atf_test_case no_programming_environment
+no_programming_environment_head()
+{
+	atf_set	"descr" "Test some POSIX constants as a positive functional test"
+}
+
+no_programming_environment_body()
+{
+	for var in $POSIX_CONSTANTS; do
+		atf_check -o "$POSITIVE_EXP_EXPR_RE" getconf $var
+	done
+	for var in $POSIX_PATH_CONSTANTS; do
+		atf_check -o "$POSITIVE_EXP_EXPR_RE" getconf $var .
+	done
+}
+
+atf_test_case programming_environment
+programming_environment_head()
+{
+	atf_set	"descr" "Test some constants with specific programming environments"
+}
+
+programming_environment_body()
+{
+	set_program_environments
+
+	for prog_env in ${SUPPORTED_PROGRAM_ENVS}; do
+		for var in $POSIX_CONSTANTS; do
+			atf_check -o "$POSITIVE_EXP_EXPR_RE" \
+			    getconf -v $prog_env $var
+		done
+	done
+}
+
+atf_test_case programming_environment_unsupported
+programming_environment_unsupported_head()
+{
+	atf_set	"descr" "Test for unsupported environments"
+}
+
+programming_environment_unsupported_body()
+{
+	set_program_environments
+
+	for prog_env in ${UNSUPPORTED_PROGRAM_ENVS}; do
+		for var in $POSIX_CONSTANTS; do
+			atf_check -e not-empty -s exit:$EX_UNAVAILABLE \
+			    getconf -v $prog_env $var
+		done
+	done
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case no_programming_environment
+	atf_add_test_case programming_environment
+	atf_add_test_case programming_environment_unsupported
+}