diff --git a/headers/posix/fcntl.h b/headers/posix/fcntl.h
index c94368435d..c424686076 100644
--- a/headers/posix/fcntl.h
+++ b/headers/posix/fcntl.h
@@ -20,11 +20,7 @@
 #define F_UNLCK         0x0200
 #define F_WRLCK         0x0400
 
-#if __GNUC__
-#	define FD_CLOEXEC	1	/* Close on exec.  */
-#else
-#	define FD_CLOEXEC      0x0800
-#endif
+#define FD_CLOEXEC		1	/* Close on exec.  */
 
 /* flags for open() */
 #define O_RDONLY		0	/* read only */
@@ -48,9 +44,10 @@
 #define O_NOFOLLOW		0x00010000
 	/* should we implement this? it's similar to O_NOTRAVERSE but will fail on symlinks */
 #define O_NOCACHE		0x00020000	/* doesn't use the file system cache if possible */
-#define O_DIRECT		O_DIRECT
+#define O_DIRECT		O_NOCACHE
 #define O_SHLOCK		0x00040000
 #define O_EXLOCK		0x00080000
+#define O_MOUNT			0x00100000	/* for file systems */
 #define O_FSYNC			0x10000000
 
 
diff --git a/headers/posix/time.h b/headers/posix/time.h
index 486b4fa8d1..ffab73081d 100644
--- a/headers/posix/time.h
+++ b/headers/posix/time.h
@@ -1,5 +1,8 @@
 #ifndef _TIME_H_
 #define _TIME_H_
+/* 
+** Distributed under the terms of the OpenBeOS License.
+*/
 
 typedef long clock_t;
 typedef long time_t;
@@ -7,11 +10,52 @@ typedef long time_t;
 #define CLOCKS_PER_SEC	1000
 #define CLK_TCK			CLOCKS_PER_SEC
 
+#define MAX_TIMESTR		70
+	/* maximum length of a string returned by asctime(), and ctime() */
+
+struct tm {
+	int	tm_sec;
+	int	tm_min;
+	int	tm_hour;
+	int	tm_mday;	/* day of month (1 to 31) */
+	int	tm_mon;		/* months since January (0 to 11) */
+	int	tm_year;	/* years since 1900 */
+	int	tm_wday;	/* days since Sunday (0 to 6, Sunday = 0, ...) */
+	int	tm_yday;	/* days since January 1 (0 to 365) */
+	int	tm_isdst;	/* daylight savings time (0 == no, >0 == yes, <0 == has to be calculated */
+	int tm_gmtoff;	/* timezone offset to GMT */
+	char *tm_zone;	/* timezone name */
+};
+
+
+/* special timezone support */
+extern char *tzname[2];
+extern int 	daylight;
+extern long	timezone;
+
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-// ToDo: add function prototypes...
+extern clock_t		clock(void);
+extern double		difftime(time_t time1, time_t time2);
+extern time_t		mktime(struct tm *tm);
+extern time_t		time(time_t *timer);
+extern char			*asctime(const struct tm *tm);
+extern char			*asctime_r(const struct tm *timep, char *buffer);
+extern char			*ctime(const time_t *timer);
+extern char			*ctime_r(const time_t *timer, char *buffer);
+extern struct tm	*gmtime(const time_t *timer);
+extern struct tm	*gmtime_r(const time_t *timer, struct tm *tm); 
+extern struct tm	*localtime(const time_t *timer);
+extern struct tm	*localtime_r(const time_t *timer, struct tm *tm);
+extern size_t		strftime(char *buffer, size_t maxSize, const char *format,
+						const struct tm *tm);
+
+/* special timezone support */
+extern void tzset(void);
+extern int	stime(const time_t *t);
 
 #ifdef __cplusplus
 }
diff --git a/headers/posix/unistd.h b/headers/posix/unistd.h
index 67e5616fa4..d53b349eaa 100644
--- a/headers/posix/unistd.h
+++ b/headers/posix/unistd.h
@@ -62,7 +62,6 @@ extern "C" {
 #	define SEEK_END 2
 #endif
 
-// ToDo: unimplemented functions are commented out
 
 /* file functions */
 extern int		access(const char *path, int accessMode);
@@ -71,7 +70,7 @@ extern int		chdir(const char *path);
 extern int		fchdir(int fd);
 extern char		*getcwd(char *buffer, size_t size);
 
-//extern int		pipe(int fildes[2]);
+extern int		pipe(int fildes[2]);
 extern int		dup(int fd);
 extern int		dup2(int fd1, int fd2);
 extern int		close(int fd);
@@ -94,14 +93,14 @@ extern ssize_t  write_pos(int fd, off_t pos, const void *buffer,size_t count);
 extern ssize_t	pwrite(int fd, const void *buffer, size_t count, off_t pos);
 extern off_t	lseek(int fd, off_t offset, int whence);
 
-//extern int		sync(void);
-//extern int		fsync(int fd);
+extern int		sync(void);
+extern int		fsync(int fd);
 
 extern int		chown(const char *path, uid_t owner, gid_t group);
 extern int		fchown(int fd, uid_t owner, gid_t group);
 extern int		lchown(const char *path, uid_t owner, gid_t group);
 
-//extern int		mknod(const char *name, mode_t mode, dev_t dev);
+extern int		mknod(const char *name, mode_t mode, dev_t dev);
 
 /* mount flags */
 #define B_MOUNT_READ_ONLY		1
@@ -117,36 +116,36 @@ extern long		fpathconf(int fd, int name);
 extern long		pathconf(const char *path, int name);
 
 /* process functions */
-//extern pid_t	fork(void);
-//extern int		execve(const char *path, char * const argv[], char * const envp[]);
-//extern int		execl(const char *path, const char *arg, ...);
-//extern int		execv(const char *path, char *const *argv);
-//extern int		execlp(const char *file, const char *arg, ...);
-//extern int		execle(const char *path, const char *arg , ... /*, char **envp */);
-//extern int		exect(const char *path, char *const *argv);
-//extern int		execvp(const char *file, char *const *argv);
+extern pid_t	fork(void);
+extern int		execve(const char *path, char * const argv[], char * const envp[]);
+extern int		execl(const char *path, const char *arg, ...);
+extern int		execv(const char *path, char *const *argv);
+extern int		execlp(const char *file, const char *arg, ...);
+extern int		execle(const char *path, const char *arg , ... /*, char **envp */);
+extern int		exect(const char *path, char *const *argv);
+extern int		execvp(const char *file, char *const *argv);
 
-//extern void		_exit(int status);
+extern void		_exit(int status);
 
-//extern int		system(const char *string);
-//extern pid_t	tcgetpgrp(int fd);
-//extern int		tcsetpgrp(int fd, pid_t pgrpid);
-//extern void		*sbrk(long incr);
+extern int		system(const char *string);
+extern pid_t	tcgetpgrp(int fd);
+extern int		tcsetpgrp(int fd, pid_t pgrpid);
+extern void		*sbrk(long incr);
 
-//extern uint		alarm(unsigned int seconds);
-//extern uint		ualarm(unsigned int microSeconds);
+extern uint		alarm(unsigned int seconds);
+extern uint		ualarm(unsigned int microSeconds);
 extern uint 	sleep(unsigned int seconds);
 extern int		usleep(unsigned int microSeconds);
-//extern clock_t	clock(void);
-//extern int 		pause(void);
+extern clock_t	clock(void);
+extern int 		pause(void);
 
 /* process */
-//extern pid_t	getpgrp(void);
-//extern pid_t	getpid(void);
-//extern pid_t	getppid(void);
+extern pid_t	getpgrp(void);
+extern pid_t	getpid(void);
+extern pid_t	getppid(void);
 
-//extern pid_t	setsid(void);
-//extern int		setpgid(pid_t pid, pid_t pgid);
+extern pid_t	setsid(void);
+extern int		setpgid(pid_t pid, pid_t pgid);
 
 /* access permissions */				
 extern gid_t	getegid(void);
@@ -167,13 +166,13 @@ extern int		sethostname(const char *hostName, size_t nameSize);
 extern int		gethostname(char *hostName, size_t nameSize);
 
 /* tty */
-//extern int		isatty(int fd);
-//extern char		*ttyname(int fd);
-//extern int		ttyname_r(int fd, char *buffer, size_t bufferSize);
-//extern char		*ctermid(char *s);
+extern int		isatty(int fd);
+extern char		*ttyname(int fd);
+extern int		ttyname_r(int fd, char *buffer, size_t bufferSize);
+extern char		*ctermid(char *s);
 
 /* misc */
-//extern char 	*crypt(const char *key, const char *salt);
+extern char 	*crypt(const char *key, const char *salt);
 extern int		getopt(int argc, char *const *argv, const char *shortOpts);
 
 /* getopt() related external variables */