posix: options: add XSI_REALTIME option group

include/zephyr/posix/posix_features.h

@@ -223,7 +223,13 @@
 #define _XOPEN_VERSION 700
 /* #define _XOPEN_CRYPT (-1L) */
 /* #define _XOPEN_ENH_I18N (-1L) */
-/* #define _XOPEN_REALTIME (-1L) */
+#if defined(CONFIG_XSI_REALTIME) ||                                                                \
+	(defined(CONFIG_POSIX_FSYNC) && defined(CONFIG_POSIX_MEMLOCK) &&                           \
+	 defined(CONFIG_POSIX_MEMLOCK_RANGE) && defined(CONFIG_POSIX_MESSAGE_PASSING) &&           \
+	 defined(CONFIG_POSIX_PRIORITY_SCHEDULING) &&                                              \
+	 defined(CONFIG_POSIX_SHARED_MEMORY_OBJECTS) && defined(CONFIG_POSIX_SYNCHRONIZED_IO))
+#define _XOPEN_REALTIME _XOPEN_VERSION
+#endif
 /* #define _XOPEN_REALTIME_THREADS (-1L) */
 /* #define _XOPEN_SHM (-1L) */
 

lib/posix/options/CMakeLists.txt

@@ -75,10 +75,6 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_FILE_SYSTEM_R)
   zephyr_library_sources_ifdef(CONFIG_POSIX_FILE_SYSTEM_R file_system_r.c)
 endif()
 
-zephyr_library_sources_ifdef(CONFIG_POSIX_FSYNC fsync.c)
-zephyr_library_sources_ifdef(CONFIG_POSIX_MEMLOCK mlockall.c)
-zephyr_library_sources_ifdef(CONFIG_POSIX_MEMLOCK_RANGE mlock.c)
-
 if (NOT CONFIG_TC_PROVIDES_POSIX_MEMORY_PROTECTION)
 zephyr_library_sources_ifdef(CONFIG_POSIX_MEMORY_PROTECTION mprotect.c)
 endif()
@@ -87,8 +83,6 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_MAPPED_FILES)
   zephyr_library_sources_ifdef(CONFIG_POSIX_MAPPED_FILES mmap.c)
 endif()
 
-zephyr_library_sources_ifdef(CONFIG_POSIX_MESSAGE_PASSING mqueue.c)
-
 if (NOT CONFIG_TC_PROVIDES_POSIX_MULTI_PROCESS)
   zephyr_library_sources_ifdef(CONFIG_POSIX_MULTI_PROCESS
     sleep.c
@@ -100,10 +94,6 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_NETWORKING)
   zephyr_library_sources_ifdef(CONFIG_POSIX_NETWORKING net.c)
 endif()
 
-if (NOT CONFIG_TC_PROVIDES_POSIX_SHARED_MEMORY_OBJECTS)
-  zephyr_library_sources_ifdef(CONFIG_POSIX_SHARED_MEMORY_OBJECTS shm.c)
-endif()
-
 if (NOT CONFIG_TC_PROVIDES_POSIX_SIGNALS)
   zephyr_library_sources_ifdef(CONFIG_POSIX_SIGNALS signal.c ${STRSIGNAL_TABLE_H})
 endif()
@@ -129,8 +119,6 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_TIMERS)
   )
 endif()
 
-zephyr_library_sources_ifdef(CONFIG_POSIX_PRIORITY_SCHEDULING sched.c)
-
 if (NOT CONFIG_TC_PROVIDES_POSIX_READER_WRITER_LOCKS)
   # Note: the Option is _POSIX_READER_WRITER_LOCKS, while the Option Group is POSIX_RW_LOCKS.
   # We have opted to use POSIX_READER_WRITER_LOCKS here to match the Option name.
@@ -154,6 +142,15 @@ if (NOT CONFIG_TC_PROVIDES_POSIX_THREADS)
   )
 endif()
 
+if (NOT CONFIG_TC_PROVIDES_XSI_REALTIME)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_FSYNC fsync.c)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_MEMLOCK mlockall.c)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_MEMLOCK_RANGE mlock.c)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_MESSAGE_PASSING mqueue.c)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_PRIORITY_SCHEDULING sched.c)
+  zephyr_library_sources_ifdef(CONFIG_POSIX_SHARED_MEMORY_OBJECTS shm.c)
+endif()
+
 zephyr_library_sources_ifdef(CONFIG_XOPEN_STREAMS stropts.c)
 
 if (NOT CONFIG_TC_PROVIDES_XSI_SYSTEM_LOGGING)

lib/posix/options/Kconfig

@@ -29,7 +29,16 @@ rsource "Kconfig.signal"
 rsource "Kconfig.spinlock"
 rsource "Kconfig.sync_io"
 rsource "Kconfig.timer"
-rsource "Kconfig.xsi"
+
+menu "X/Open system interfaces"
+
+rsource "Kconfig.xsi_realtime"
+rsource "Kconfig.xsi_single_process"
+rsource "Kconfig.xsi_streams"
+rsource "Kconfig.xsi_system_logging"
+rsource "Kconfig.xsi_threads_ext"
+
+endmenu # "X/Open system interfaces"
 
 rsource "Kconfig.compat"
 

lib/posix/options/Kconfig.mem

@@ -49,7 +49,7 @@ config POSIX_MEMLOCK
 
 config POSIX_MEMLOCK_RANGE
 	bool "POSIX range memory locking"
-	imply MMU
+	imply MMU if (CPU_HAS_MMU && ARCH_HAS_DEMAND_PAGING)
 	imply DEMAND_PAGING
 	help
 	  Select 'y' here and Zephyr will provide support for mlock() and munlock().

lib/posix/options/Kconfig.profile

@@ -102,8 +102,8 @@ config POSIX_BASE_DEFINITIONS
 	select POSIX_ASYNCHRONOUS_IO
 	select POSIX_BARRIERS
 	select POSIX_CLOCK_SELECTION
-	# select POSIX_MAPPED_FILES
-	# select POSIX_MEMORY_PROTECTION
+	select POSIX_MAPPED_FILES
+	select POSIX_MEMORY_PROTECTION
 	select POSIX_READER_WRITER_LOCKS
 	select POSIX_REALTIME_SIGNALS
 	select POSIX_SEMAPHORES
@@ -128,10 +128,10 @@ config POSIX_AEP_REALTIME_MINIMAL
 	select XSI_THREADS_EXT
 	# Options
 	select POSIX_FSYNC
-	# select POSIX_MEMLOCK
-	# select POSIX_MEMLOCK_RANGE
+	select POSIX_MEMLOCK
+	select POSIX_MEMLOCK_RANGE
 	select POSIX_MONOTONIC_CLOCK
-	# select POSIX_SHARED_MEMORY_OBJECTS
+	select POSIX_SHARED_MEMORY_OBJECTS
 	select POSIX_SYNCHRONIZED_IO
 	select POSIX_THREAD_ATTR_STACKADDR
 	select POSIX_THREAD_ATTR_STACKSIZE

lib/posix/options/Kconfig.toolchain

@@ -135,9 +135,6 @@ config TC_PROVIDES_POSIX_READER_WRITER_LOCKS
 config TC_PROVIDES_POSIX_SEMAPHORES
 	bool
 
-config TC_PROVIDES_POSIX_SHARED_MEMORY_OBJECTS
-	bool
-
 config TC_PROVIDES_POSIX_SHELL_FUNC
 	bool
 
@@ -215,6 +212,9 @@ config TC_PROVIDES_XSI_MATH
 config TC_PROVIDES_XSI_MULTI_PROCESS
 	bool
 
+config TC_PROVIDES_XSI_REALTIME
+	bool
+
 config TC_PROVIDES_XSI_SIGNALS
 	bool
 

lib/posix/options/Kconfig.xsi_realtime

@@ -0,0 +1,28 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config XSI_REALTIME
+	bool "X/Open realtime"
+	select POSIX_FSYNC
+	select POSIX_MEMLOCK
+	select POSIX_MEMLOCK_RANGE
+	select POSIX_MESSAGE_PASSING
+	# Not yet implemented, but optional
+	# imply POSIX_PRIORITIZED_IO
+	select POSIX_PRIORITY_SCHEDULING
+	select POSIX_SHARED_MEMORY_OBJECTS
+	select POSIX_SYNCHRONIZED_IO
+	help
+	  Select 'y' here and the following functions will be provided:
+
+	  fsync(), mlockall(), munlockall(), mlock(), munlock(), mq_close(), mq_getattr(), mq_notify(),
+	  mq_open(), mq_receive(), mq_send(), mq_setattr(), mq_unlink(), sched_get_priority_max(),
+	  sched_get_priority_min(), sched_getparam(), sched_getscheduler(), sched_rr_get_interval(),
+	  sched_setparam(), sched_setscheduler(), sched_yield(), mmap(), munmap(), shm_open(),
+	  shm_unlink()
+
+	  The functions fsync(), fdatasync(), and open() will provide synchronized I/O capability.
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap02.html

lib/posix/options/Kconfig.xsi_single_process

@@ -0,0 +1,14 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config XSI_SINGLE_PROCESS
+	bool "X/Open single process"
+	depends on POSIX_SINGLE_PROCESS
+	depends on POSIX_TIMERS
+	help
+	  Select 'y' here and Zephyr will provide implementations of
+	  gethostid(), gettimeofday(), and putenv().
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html

lib/posix/options/Kconfig.xsi_streams

@@ -0,0 +1,12 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config XOPEN_STREAMS
+	bool "X/Open streams"
+	help
+	  This option provides support for the X/Open Streams interface, including functions such as
+	  fattach(), fdetach(), getmsg(), getpmsg(), putmsg(), and putpmsg().
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap02.html#tag_02_01_05_09

lib/posix/options/Kconfig.xsi_system_logging

@@ -0,0 +1,12 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config XSI_SYSTEM_LOGGING
+	bool "X/Open system logging"
+	help
+	  This option provides support for closelog(), openlog(), syslog(),
+	  setlogmask(), and vsyslog().
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html

lib/posix/options/Kconfig.xsi_threads_ext

@@ -0,0 +1,12 @@
+# Copyright (c) 2024 Tenstorrent AI ULC
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config XSI_THREADS_EXT
+	bool "X/Open threads extensions"
+	help
+	  This option provides support for pthread_attr_getstack(), pthread_attr_setstack(),
+	  pthread_getconcurrency(), and pthread_setconcurrency().
+
+	  For more information, please see
+	  https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_subprofiles.html

lib/posix/options/mlock.c

@@ -13,18 +13,28 @@
 
 int mlock(const void *addr, size_t len)
 {
-	void *const _addr = (void *)addr;
+	if (IS_ENABLED(CONFIG_DEMAND_PAGING)) {
+		void *const _addr = (void *)addr;
 
-	k_mem_pin(_addr, len);
+		k_mem_pin(_addr, len);
 
-	return 0;
+		return 0;
+	}
+
+	errno = ENOTSUP;
+	return -1;
 }
 
 int munlock(const void *addr, size_t len)
 {
-	void *const _addr = (void *)addr;
+	if (IS_ENABLED(CONFIG_DEMAND_PAGING)) {
+		void *const _addr = (void *)addr;
+
+		k_mem_unpin(_addr, len);
 
-	k_mem_unpin(_addr, len);
+		return 0;
+	}
 
-	return 0;
+	errno = ENOTSUP;
+	return -1;
 }