lib: libc: arcmwdt: update headers for posix compatibility

Additional workarounds for POSIX compatibility with the arcmwdt
toolchain.

This commit addresses issues described in the comment linked below.

https://github.com/zephyrproject-rtos/zephyr/pull/97152#\
issuecomment-3409956230

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

Author: cfriedt

lib/libc/arcmwdt/include/aio.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_AIO_H_
+#define ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_AIO_H_
+
+#include <zephyr/posix/aio.h>
+
+#endif /* ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_AIO_H_ */

lib/libc/arcmwdt/include/arpa/inet.h

@@ -0,0 +1,12 @@
+/*
+ * Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_ARPA_INET_H_
+#define ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_ARPA_INET_H_
+
+#include <zephyr/posix/arpa/inet.h>
+
+#endif /* ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_ARPA_INET_H_ */

lib/libc/arcmwdt/include/sys/types.h

@@ -17,6 +17,7 @@
 #define _NLINK_T_DECLARED
 #define _UID_T_DECLARED
 #define _GID_T_DECLARED
+#define _PID_T_DECLARED
 
 #ifndef _SSIZE_T_DEFINED
 #define _SSIZE_T_DEFINED

lib/libc/arcmwdt/include/time.h

@@ -9,6 +9,25 @@
 
 #include_next <time.h>
 
+#if defined(_POSIX_C_SOURCE)
+/*
+ * POSIX requires time.h to define pid_t and clockid_t
+ * https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/time.h.html
+ */
+#if !defined(_PID_T_DECLARED)
+typedef long pid_t;
+#define _PID_T_DECLARED
+#endif
+
+#if !defined(_CLOCKID_T_DECLARED)
+typedef int clockid_t;
+#define _CLOCKID_T_DECLARED
+#endif
+#endif
+
+/* pull in sys/timespec.h for struct timespec and _TIMESPEC_DECLARED */
+#include "sys/timespec.h"
+
 #include <zephyr/posix/posix_time.h>
 
 #ifdef __cplusplus

lib/libc/arcmwdt/include/unistd.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright The Zephyr Project Contributors
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_UNISTD_H_
+#define ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_UNISTD_H_
+
+#include_next <unistd.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(_XOPEN_SOURCE)
+long gethostid(void);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_LIB_LIBC_ARCMWDT_INCLUDE_UNISTD_H_ */