posix: deprecate CONFIG_POSIX_API and remove zephyr/posix include prefix

doc/releases/release-notes-4.3.rst

@@ -140,6 +140,11 @@ Deprecated APIs and options
 
 * RISCV's :kconfig:option:`CONFIG_EXTRA_EXCEPTION_INFO` is deprecated. Use :kconfig:option:`CONFIG_EXCEPTION_DEBUG` instead.
 
+* :kconfig:option:`CONFIG_XOPEN_STREAMS` was deprecated. Instead, use :kconfig:option:`CONFIG_XSI_STREAMS`.
+
+* :kconfig:option:`CONFIG_POSIX_API` was deprecated. See :ref:`POSIX Configuration<posix_config>`
+  for more details.
+
 New APIs and options
 ====================
 

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

@@ -97,7 +97,7 @@ POSIX System Interfaces
     _XOPEN_CRYPT, -1,
     :ref:`_XOPEN_REALTIME <posix_option_group_xsi_realtime>`, 700, :kconfig:option:`CONFIG_XSI_REALTIME`
     _XOPEN_REALTIME_THREADS, -1,
-    :ref:`_XOPEN_STREAMS<posix_option_xopen_streams>`, 200809L, :kconfig:option:`CONFIG_XOPEN_STREAMS`
+    :ref:`_XOPEN_STREAMS<posix_option_xopen_streams>`, 200809L, :kconfig:option:`CONFIG_XSI_STREAMS`
     _XOPEN_UNIX, -1,
 
 

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

@@ -19,7 +19,7 @@ implementation of the POSIX API.
 * :kconfig:option:`CONFIG_NET_SOCKETS`
 * :kconfig:option:`CONFIG_ZVFS_POLL_MAX`
 * :kconfig:option:`CONFIG_ZVFS_OPEN_MAX`
-* :kconfig:option:`CONFIG_POSIX_API`
+* :kconfig:option:`CONFIG_POSIX_SYSTEM_INTERFACES`
 * :kconfig:option:`CONFIG_POSIX_OPEN_MAX`
 * :kconfig:option:`CONFIG_POSIX_PTHREAD_ATTR_GUARDSIZE_BITS`
 * :kconfig:option:`CONFIG_POSIX_PTHREAD_ATTR_GUARDSIZE_DEFAULT`

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

@@ -1111,7 +1111,7 @@ implemented in Zephyr but are provided so that conformant applications can still
 Unimplemented functions in this option group will fail, setting ``errno`` to ``ENOSYS``
 :ref:`†<posix_undefined_behaviour>`.
 
-Enable this option with :kconfig:option:`CONFIG_XOPEN_STREAMS`.
+Enable this option with :kconfig:option:`CONFIG_XSI_STREAMS`.
 
 .. csv-table:: _XOPEN_STREAMS
    :header: API, Supported

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

@@ -85,10 +85,10 @@ leverages the ``nanosleep()`` and ``perror()`` POSIX functions.
 .. code-block:: cfg
    :caption: `prj.conf` for a simple POSIX app in Zephyr
 
-    CONFIG_POSIX_API=y
+    CONFIG_POSIX_AEP_REALTIME_MINIMAL=y
 
 .. code-block:: c
-   :caption: A simple app that uses Zephyr's POSIX API
+   :caption: A simple app that uses the POSIX API
 
     #include <stddef.h>
     #include <stdio.h>
@@ -128,38 +128,30 @@ explicitly choose to enable POSIX options via :ref:`Kconfig<kconfig>` selection.
 Subprofiles
 +++++++++++
 
-Enable one of the Kconfig options below to quickly configure a pre-defined
+Applications should enable one of the Kconfig options below to quickly configure a pre-defined
 :ref:`POSIX subprofile <posix_subprofiles>`.
 
 * :kconfig:option:`CONFIG_POSIX_AEP_CHOICE_BASE` (:ref:`Base <posix_system_interfaces_required>`)
 * :kconfig:option:`CONFIG_POSIX_AEP_CHOICE_PSE51` (:ref:`PSE51 <posix_aep_pse51>`)
 * :kconfig:option:`CONFIG_POSIX_AEP_CHOICE_PSE52` (:ref:`PSE52 <posix_aep_pse52>`)
 * :kconfig:option:`CONFIG_POSIX_AEP_CHOICE_PSE53` (:ref:`PSE53 <posix_aep_pse53>`)
 
-Additional POSIX :ref:`Options and Option Groups <posix_option_groups>` may be enabled as needed
-via Kconfig (e.g. ``CONFIG_POSIX_C_LIB_EXT=y``). Further fine-tuning may be accomplished via
-:ref:`additional POSIX-related Kconfig options <posix_kconfig_options>`.
+Libraries should depend on :kconfig:option:`CONFIG_POSIX_SYSTEM_INTERFACES` and other
+POSIX :ref:`Option Groups <posix_option_groups>`, as needed.
 
-Subprofiles, Options, and Option Groups should be considered the preferred way to configure POSIX
-in Zephyr going forward.
+Further fine-tuning may be accomplished via
+:ref:`additional POSIX-related Kconfig options <posix_kconfig_options>`.
 
 Legacy
 ++++++
 
 Historically, Zephyr used :kconfig:option:`CONFIG_POSIX_API` to configure a set of POSIX features
 that was overloaded and always increasing in size.
 
-* :kconfig:option:`CONFIG_POSIX_API`
-
-The option is now frozen, and can be considered equivalent to the following:
-
-* :kconfig:option:`CONFIG_POSIX_AEP_CHOICE_PSE51`
-* :kconfig:option:`CONFIG_POSIX_FD_MGMT`
-* :kconfig:option:`CONFIG_POSIX_MESSAGE_PASSING`
-* :kconfig:option:`CONFIG_POSIX_NETWORKING`
+The :kconfig:option:`CONFIG_POSIX_API` is now deprecated and is slated for removal in Zephyr
+v4.5.0.
 
-However, :kconfig:option:`CONFIG_POSIX_API` should be considered legacy and should not be used for
-new Zephyr applications.
+Applications should select a POSIX subprofile mentioned above.
 
 .. _IEEE: https://www.ieee.org/
 .. _IEEE Computer Society: https://www.computer.org/

drivers/modem/Kconfig

@@ -158,7 +158,7 @@ config MODEM_SOCKET
 	  Note that the modem socket uses runtime allocated file descriptors
 	  reserved from the fdtable, for which the max count is set using the
 	  Kconfig option ZVFS_OPEN_MAX. Make sure to update this value as both
-	  the modem sockets and the POSIX_API, if used, share them.
+	  the modem sockets and other POSIX APIs, if used, share them.
 
 config MODEM_SOCKET_PACKET_COUNT
 	int "Maximum number of stored packet sizes per socket"

drivers/modem/ublox-sara-r4.c

@@ -15,7 +15,7 @@ LOG_MODULE_REGISTER(modem_ublox_sara_r4, CONFIG_MODEM_LOG_LEVEL);
 #include <zephyr/drivers/gpio.h>
 #include <zephyr/device.h>
 #include <zephyr/init.h>
-#include <zephyr/posix/fcntl.h>
+#include <fcntl.h>
 
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/net_offload.h>

drivers/net/nsos_fcntl.c

@@ -19,11 +19,7 @@
 /*
  * When building for Zephyr, use Zephyr specific fcntl definitions.
  */
-#ifdef __ZEPHYR__
-#include <zephyr/posix/fcntl.h>
-#else
 #include <fcntl.h>
-#endif
 
 #include "nsi_errno.h"
 #include "nsos_fcntl.h"

drivers/net/nsos_sockets.c

@@ -24,7 +24,7 @@ LOG_MODULE_REGISTER(nsos_sockets);
 #include <zephyr/net/net_ip.h>
 #include <zephyr/net/offloaded_netdev.h>
 #include <zephyr/net/socket_offload.h>
-#include <zephyr/posix/fcntl.h>
+#include <fcntl.h>
 #include <zephyr/sys/fdtable.h>
 #include <zephyr/sys/dlist.h>
 

drivers/net/ppp.c

@@ -26,12 +26,12 @@ LOG_MODULE_REGISTER(net_ppp, LOG_LEVEL);
 #include <zephyr/net_buf.h>
 #include <zephyr/net/net_pkt.h>
 #include <zephyr/net/net_if.h>
+#include <zephyr/net/if_arp.h>
 #include <zephyr/net/net_core.h>
 #include <zephyr/sys/ring_buffer.h>
 #include <zephyr/sys/crc.h>
 #include <zephyr/drivers/uart.h>
 #include <zephyr/random/random.h>
-#include <zephyr/posix/net/if_arp.h>
 #include <zephyr/net/ethernet.h>
 #include <zephyr/net/capture.h>
 

drivers/wifi/nxp/Kconfig.nxp

@@ -1133,10 +1133,15 @@ if NXP_WIFI_SMOKE_TESTS
 
 config NXP_WIFI_SIGMA_AGENT
 	bool "Wi-Fi Alliance Sigma Agent Support"
-	select POSIX_API
-	select POSIX_THREADS
+	select POSIX_SYSTEM_INTERFACES
+	select POSIX_BASE_DEFINITIONS
+	select POSIX_AEP_REALTIME_MINIMAL
+	select POSIX_NETWORKING
+	imply EVENTFD
+	imply POSIX_FD_MGMT
+	imply POSIX_MULTI_PROCESS
+	imply XSI_SINGLE_PROCESS
 	select PTHREAD_CREATE_BARRIER
-	select POSIX_TIMERS
 	help
 	  This option is to enable Wi-Fi Alliance Sigma Agent support in the Wi-Fi driver.
 

drivers/wifi/simplelink/CMakeLists.txt

@@ -9,5 +9,7 @@ if(CONFIG_WIFI_SIMPLELINK)
     simplelink_support.c
     simplelink.c
     )
+  # TI's driver portability layer relies on POSIX for multi-threading and timers
+  zephyr_library_compile_definitions(_POSIX_C_SOURCE=200809L)
 endif()
 zephyr_library_sources_ifdef(CONFIG_NET_SOCKETS_OFFLOAD simplelink_sockets.c)

drivers/wifi/simplelink/Kconfig.simplelink

@@ -9,7 +9,9 @@ menuconfig WIFI_SIMPLELINK
 	select WIFI_OFFLOAD
 	select NET_L2_WIFI_MGMT
 	select FDTABLE
-	select POSIX_SEMAPHORES
+	# TI's driver portability layer relies on POSIX for multi-threading and timers
+	select POSIX_BASE_DEFINITIONS
+	select POSIX_SYSTEM_INTERFACES
 
 if WIFI_SIMPLELINK
 

drivers/wifi/simplelink/simplelink_sockets.c

@@ -9,7 +9,7 @@ LOG_MODULE_DECLARE(LOG_MODULE_NAME);
 
 #include <stdlib.h>
 #include <limits.h>
-#include <zephyr/posix/fcntl.h>
+#include <fcntl.h>
 
 #include <zephyr/kernel.h>
 /* Define sockaddr, etc, before simplelink.h */

include/zephyr/net/ethernet.h

@@ -18,8 +18,6 @@
 #include <stdbool.h>
 #include <zephyr/sys/atomic.h>
 
-#include <zephyr/net/net_ip.h>
-#include <zephyr/net/net_pkt.h>
 #include <zephyr/net/lldp.h>
 #include <zephyr/sys/util.h>
 #include <zephyr/net/net_if.h>