POSIX: add utmpx.h and function stubs

OpenJDK 14 assumes symbols and headers are available.

Change-Id: I21038e92afcfd2000ee95712bce874afd29611b6
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3371
Reviewed-by: Axel Dörfler <axeld@pinc-software.de>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

headers/posix/utmpx.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020 Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _UTMPX_H_
+#define _UTMPX_H_
+
+
+#include <sys/time.h>
+#include <sys/types.h>
+
+
+struct utmpx {
+	short 			ut_type;		/* type of entry */
+	struct timeval	ut_tv;			/* modification time */
+	char			ut_id[8];		/* entry identifier */
+	pid_t			ut_pid;			/* process ID */
+	char			ut_user[32];	/* user login name */
+	char			ut_line[16];	/* device name */
+	char			__ut_reserved[192];
+};
+
+
+#define	EMPTY			0	/* No valid user accounting information. */
+#define	BOOT_TIME		1	/* Identifies time of system boot. */
+#define	OLD_TIME		2	/* Identifies time when system clock changed. */
+#define	NEW_TIME		3	/* Identifies time after system clock changed. */
+#define	USER_PROCESS	4	/* Identifies a process. */
+#define	INIT_PROCESS	5	/* Identifies a process spawned by the init process. */
+#define	LOGIN_PROCESS	6	/* Identifies the session leader of a logged-in user. */
+#define	DEAD_PROCESS	7	/* Identifies a session leader who has exited. */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void endutxent(void);
+struct utmpx* getutxent(void);
+struct utmpx* getutxid(const struct utmpx *);
+struct utmpx* getutxline(const struct utmpx *);
+struct utmpx* pututxline(const struct utmpx *);
+void setutxent(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _UTMPX_H_ */

src/system/libroot/posix/Jamfile

@@ -37,6 +37,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			syslog.cpp
 			termios.c
 			utime.c
+			utmpx.cpp
 			;
 	}
 }

src/system/libroot/posix/utmpx.cpp

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2020 Haiku, Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+
+#include <utmpx.h>
+
+
+void
+endutxent(void)
+{
+}
+
+
+void
+setutxent(void)
+{
+}
+
+
+struct utmpx*
+getutxent(void)
+{
+	return NULL;
+}
+
+
+struct utmpx*
+getutxid(const struct utmpx *ut)
+{
+	return NULL;
+}
+
+
+struct utmpx*
+getutxline(const struct utmpx *ut)
+{
+	return NULL;
+}
+
+
+struct utmpx*
+pututxline(const struct utmpx *ut)
+{
+	return NULL;
+}
+