posix: options: implement POSIX_SYSTEM_DATABASE_R

Provide an implementation for the POSIX_SYSTEM_DATABASE_R
Option Group.

This group is required for all conforming implementations and is
therefore required for PSE51, PSE52, PSE53, PSE54, and all other
possible subprofiles.

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

include/zephyr/posix/grp.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024 Meta Platforms
+ * Copyright (c) 2024 Tenstorrent AI ULC
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -24,9 +25,18 @@ struct group {
 	char **gr_mem;
 };
 
+#if defined(_XOPEN_SOURCE)
+void endgrent(void);
+struct group *getgrent(void);
+#endif
+struct group *getgrgid(gid_t gid);
+int getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t bufsize, struct group **result);
+struct group *getgrnam(const char *name);
 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);
+#if defined(_XOPEN_SOURCE)
+void setgrent(void);
+#endif
 
 #ifdef __cplusplus
 }

include/zephyr/posix/pwd.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2024 Meta Platforms
+ * Copyright (c) 2024 Tenstorrent AI ULC
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -25,9 +26,18 @@ struct passwd {
 	char *pw_shell;
 };
 
-int getpwnam_r(const char *nam, struct passwd *pwd, char *buffer, size_t bufsize,
+#if defined(_XOPEN_SOURCE)
+void endpwent(void);
+struct passwd *getpwent(void);
+#endif
+struct passwd *getpwnam(const char *name);
+int getpwnam_r(const char *name, struct passwd *pwd, char *buffer, size_t bufsize,
 	       struct passwd **result);
+struct passwd *getpwuid(uid_t uid);
 int getpwuid_r(uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result);
+#if defined(_XOPEN_SOURCE)
+void setpwent(void);
+#endif
 
 #ifdef __cplusplus
 }

include/zephyr/posix/sys/sysconf.h

@@ -264,8 +264,8 @@ enum {
 #define __z_posix_sysconf_SC_XOPEN_UUCP                   (-1L)
 #define __z_posix_sysconf_SC_XOPEN_VERSION                _XOPEN_VERSION
 #define __z_posix_sysconf_SC_CLK_TCK                      (100L)
-#define __z_posix_sysconf_SC_GETGR_R_SIZE_MAX             (0L)
-#define __z_posix_sysconf_SC_GETPW_R_SIZE_MAX             (0L)
+#define __z_posix_sysconf_SC_GETGR_R_SIZE_MAX             CONFIG_POSIX_GETGR_R_SIZE_MAX
+#define __z_posix_sysconf_SC_GETPW_R_SIZE_MAX             CONFIG_POSIX_GETPW_R_SIZE_MAX
 #define __z_posix_sysconf_SC_AIO_LISTIO_MAX               AIO_LISTIO_MAX
 #define __z_posix_sysconf_SC_AIO_MAX                      AIO_MAX
 #define __z_posix_sysconf_SC_AIO_PRIO_DELTA_MAX           AIO_PRIO_DELTA_MAX

lib/posix/options/CMakeLists.txt

@@ -121,6 +121,13 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_SPIN_LOCKS)
   zephyr_library_sources_ifdef(CONFIG_POSIX_SPIN_LOCKS spinlock.c)
 endif()
 
+if (NOT CONFIG_TC_PROVIDES_POSIX_SYSTEM_DATABASE_R)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_SYSTEM_DATABASE_R
+    system_database_priv.c
+    system_database_r.c
+  )
+endif()
+
 if (NOT CONFIG_TC_PROVIDES_POSIX_TIMERS)
   zephyr_library_sources_ifdef(CONFIG_POSIX_TIMERS
     clock.c
@@ -145,11 +152,9 @@ 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/Kconfig

@@ -28,6 +28,7 @@ rsource "Kconfig.semaphore"
 rsource "Kconfig.signal"
 rsource "Kconfig.spinlock"
 rsource "Kconfig.sync_io"
+rsource "Kconfig.system_database_r"
 rsource "Kconfig.timer"
 
 menu "X/Open system interfaces"

lib/posix/options/Kconfig.system_database_r

@@ -0,0 +1,42 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config POSIX_SYSTEM_DATABASE_R
+	bool "POSIX System Database"
+	help
+	  Select 'y' here, and the system will support getgrgid_r(), getgrnam_r(), getpwnam_r(), and
+	  getpwuid_r().
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html
+
+config POSIX_GETGR_R_SIZE_MAX
+	int "Initial size of getgrgid_r() and getgrnam_r() data buffers"
+	default 96
+	help
+	  This option sets the maximum size of the buffer for getgrgid_r() and getgrnam_r().
+
+	  The default size is derived from the formula below. Note, that the home directory and
+	  shell fields are not based on PATH_MAX, which can be excessively large.
+
+	  _POSIX_LOGIN_NAME_MAX + 1 +
+	  sizeof(void *) +
+	  sizeof("4294967295") + 1 +
+	  2 * (_POSIX_NAME_MAX + 1 + sizeof(void *))
+	  + sizeof(void *)
+
+config POSIX_GETPW_R_SIZE_MAX
+	int "Initial size of getpwnam_r() and getpwuid_r() data buffers"
+	default 64
+	help
+	  This option sets the maximum size of the buffer for getpwnam_r() and getpwuid_r().
+
+	  The default size is derived from the formula below. Note, that the home directory and
+	  shell fields are not based on PATH_MAX, which can be excessively large.
+
+	  _POSIX_LOGIN_NAME_MAX + 1 +
+	  sizeof("4294967295") + 1 +
+	  sizeof("4294967295") + 1 +
+	  _POSIX_NAME_MAX + 1 +
+	  _POSIX_NAME_MAX + 1