tests: posix: common: separate posix single process into a standalone test

posix.common contains testsuites that can be separated into smaller
groups of tests. This change moves confstr, sysconf and uname into
a singular testsuite at tests/posix/single_process app directory.

Signed-off-by: Marvin Ouma <pancakesdeath@protonmail.com>

tests/posix/single_process/CMakeLists.txt

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(posix_single_process)
+
+FILE(GLOB app_sources src/*.c)
+
+target_sources(app PRIVATE ${app_sources})
+
+target_compile_options(app PRIVATE -U_POSIX_C_SOURCE -D_POSIX_C_SOURCE=200809L)

tests/posix/single_process/prj.conf

@@ -0,0 +1,5 @@
+CONFIG_POSIX_API=y
+CONFIG_ZTEST=y
+
+CONFIG_POSIX_AEP_CHOICE_BASE=y
+CONFIG_POSIX_SINGLE_PROCESS=y

tests/posix/single_process/src/confstr.c

@@ -10,7 +10,7 @@
 #include <zephyr/ztest.h>
 #include <zephyr/sys/util.h>
 
-ZTEST(confstr, test_confstr)
+ZTEST(posix_single_process, test_confstr)
 {
 	char buf[1];
 
@@ -63,5 +63,3 @@ ZTEST(confstr, test_confstr)
 	zassert_true(confstr(_CS_PATH, buf, sizeof(buf) > 0));
 	zassert_equal(buf[0], '\0');
 }
-
-ZTEST_SUITE(confstr, NULL, NULL, NULL, NULL, NULL);

tests/posix/single_process/src/main.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2023, Meta
+ * Copyright (c) 2024, Marvin Ouma <pancakesdeath@protonmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/ztest.h>
+
+ZTEST_SUITE(posix_single_process, NULL, NULL, NULL, NULL, NULL);

tests/posix/single_process/src/sysconf.c

@@ -8,7 +8,7 @@
 #include <zephyr/ztest.h>
 #include <unistd.h>
 
-ZTEST(posix_apis, test_posix_sysconf)
+ZTEST(posix_single_process, test_posix_sysconf)
 {
 	long ret;
 
@@ -23,10 +23,7 @@ ZTEST(posix_apis, test_posix_sysconf)
 	/* SC that value depends on target's configuration */
 	ret = sysconf(_SC_SEMAPHORES);
 	if (IS_ENABLED(CONFIG_POSIX_THREADS)) {
-		zassert_equal(ret,
+		zassert_equal(ret, _POSIX_VERSION, "sysconf returned unexpected value %d", ret);
-			      _POSIX_VERSION,
-			      "sysconf returned unexpected value %d",
-			      ret);
 	} else {
 		zassert_equal(ret, -1L, "sysconf returned unexpected value %d", ret);
 	}

tests/posix/single_process/src/uname.c

@@ -9,7 +9,7 @@
 
 #include <zephyr/ztest.h>
 
-ZTEST(uname, test_uname)
+ZTEST(posix_single_process, test_uname)
 {
 	struct utsname info;
 
@@ -17,5 +17,3 @@ ZTEST(uname, test_uname)
 	zassert_ok(strncmp(info.sysname, "Zephyr", sizeof(info.sysname)));
 	zassert_ok(strncmp(info.machine, CONFIG_ARCH, sizeof(info.machine)));
 }
-
-ZTEST_SUITE(uname, NULL, NULL, NULL, NULL, NULL);

tests/posix/single_process/testcase.yaml

@@ -0,0 +1,25 @@
+common:
+  filter: not CONFIG_NATIVE_LIBC
+  tags:
+    - posix
+    - single_process
+  # 1 tier0 platform per supported architecture
+  platform_key:
+    - arch
+    - simulation
+tests:
+  portability.single_process.rwlocks:
+    min_flash: 64
+    min_ram: 32
+  portability.posix.single_process.minimal:
+    extra_configs:
+      - CONFIG_MINIMAL_LIBC=y
+  portability.posix.single_process.newlib:
+    filter: TOOLCHAIN_HAS_NEWLIB == 1
+    extra_configs:
+      - CONFIG_NEWLIB_LIBC=y
+  portability.posix.single_process.picolibc:
+    tags: picolibc
+    filter: CONFIG_PICOLIBC_SUPPORTED
+    extra_configs:
+      - CONFIG_PICOLIBC=y