lib: posix: add stubs for thread-safe grp & pwd functions

Create stubs for getpwnam_r, getpwuid_r, getgrgid_r
& getgrnam_r.

These functions are in the _POSIX_THREAD_SAFE_FUNCTIONS
option group.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>

doc/services/portability/posix/option_groups/index.rst

@@ -988,10 +988,10 @@ Enable this option with :kconfig:option:`CONFIG_POSIX_THREAD_SAFE_FUNCTIONS`.
     funlockfile(),
     getc_unlocked(),
     getchar_unlocked(),
-    getgrgid_r(),
+    getgrgid_r(),yes :ref:`†<posix_undefined_behaviour>`
-    getgrnam_r(),
+    getgrnam_r(),yes :ref:`†<posix_undefined_behaviour>`
-    getpwnam_r(),
+    getpwnam_r(),yes :ref:`†<posix_undefined_behaviour>`
-    getpwuid_r(),
+    getpwuid_r(),yes :ref:`†<posix_undefined_behaviour>`
     gmtime_r(), yes
     localtime_r(),
     putc_unlocked(),

include/zephyr/posix/grp.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_INCLUDE_POSIX_GRP_H_
+#define ZEPHYR_INCLUDE_POSIX_GRP_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <zephyr/posix/sys/stat.h>
+
+/**
+ * @brief Group structure
+ */
+struct group {
+	/**< the name of the group */
+	char *gr_name;
+	/**< numerical group ID */
+	gid_t gr_gid;
+	/**< pointer to a null-terminated array of character pointers to member names */
+	char **gr_mem;
+};
+
+int getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize,
+	       struct group **result);
+int getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize, struct group **result);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_INCLUDE_POSIX_GRP_H_ */

include/zephyr/posix/pwd.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_INCLUDE_POSIX_PWD_H_
+#define ZEPHYR_INCLUDE_POSIX_PWD_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <zephyr/posix/sys/stat.h>
+
+struct passwd {
+	/* user's login name */
+	char *pw_name;
+	/* numerical user ID */
+	uid_t pw_uid;
+	/* numerical group ID */
+	gid_t pw_gid;
+	/* initial working directory */
+	char *pw_dir;
+	/* program to use as shell */
+	char *pw_shell;
+};
+
+int getpwnam_r(const char *nam, struct passwd *pwd, char *buffer, size_t bufsize,
+	       struct passwd **result);
+int getpwuid_r(uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_INCLUDE_POSIX_PWD_H_ */

lib/posix/options/CMakeLists.txt

@@ -142,9 +142,11 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_THREADS)
   # We have opted to use POSIX_THREADS here to match the Option name.
   zephyr_library_sources_ifdef(CONFIG_POSIX_THREADS
     cond.c
+    grp.c
     key.c
     mutex.c
     pthread.c
+    pwd.c
   )
 endif()
 

lib/posix/options/grp.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+
+#include <zephyr/sys/util.h>
+#include <zephyr/posix/grp.h>
+
+#ifdef CONFIG_POSIX_THREAD_SAFE_FUNCTIONS
+
+int getgrnam_r(const char *name, struct group *grp, char *buffer, size_t bufsize,
+	       struct group **result)
+{
+	ARG_UNUSED(name);
+	ARG_UNUSED(grp);
+	ARG_UNUSED(buffer);
+	ARG_UNUSED(bufsize);
+	ARG_UNUSED(result);
+
+	return ENOSYS;
+}
+
+int getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize, struct group **result)
+{
+	ARG_UNUSED(gid);
+	ARG_UNUSED(grp);
+	ARG_UNUSED(buffer);
+	ARG_UNUSED(bufsize);
+	ARG_UNUSED(result);
+
+	return ENOSYS;
+}
+
+#endif /* CONFIG_POSIX_THREAD_SAFE_FUNCTIONS */

lib/posix/options/pwd.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+
+#include <zephyr/sys/util.h>
+#include <zephyr/posix/pwd.h>
+
+#ifdef CONFIG_POSIX_THREAD_SAFE_FUNCTIONS
+
+int getpwnam_r(const char *nam, struct passwd *pwd, char *buffer, size_t bufsize,
+	       struct passwd **result)
+{
+	ARG_UNUSED(nam);
+	ARG_UNUSED(pwd);
+	ARG_UNUSED(buffer);
+	ARG_UNUSED(bufsize);
+	ARG_UNUSED(result);
+
+	return ENOSYS;
+}
+
+int getpwuid_r(uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
+{
+	ARG_UNUSED(uid);
+	ARG_UNUSED(pwd);
+	ARG_UNUSED(buffer);
+	ARG_UNUSED(bufsize);
+	ARG_UNUSED(result);
+
+	return ENOSYS;
+}
+
+#endif /* CONFIG_POSIX_THREAD_SAFE_FUNCTIONS */

tests/posix/common/src/grp.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+#include <grp.h>
+
+#include <zephyr/ztest.h>
+
+ZTEST(grp, test_grp_stubs)
+{
+	zassert_equal(getgrnam_r(NULL, NULL, NULL, 42, NULL), ENOSYS);
+	zassert_equal(getgrgid_r(42, NULL, NULL, 42, NULL), ENOSYS);
+}
+
+ZTEST_SUITE(grp, NULL, NULL, NULL, NULL, NULL);

tests/posix/common/src/pwd.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2024 Meta Platforms
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <errno.h>
+#include <pwd.h>
+
+#include <zephyr/ztest.h>
+
+ZTEST(pwd, test_pwd_stubs)
+{
+	zassert_equal(getpwnam_r(NULL, NULL, NULL, 42, NULL), ENOSYS);
+	zassert_equal(getpwuid_r(42, NULL, NULL, 42, NULL), ENOSYS);
+}
+
+ZTEST_SUITE(pwd, NULL, NULL, NULL, NULL, NULL);