Update to manual pages.

Introduced an ENOMAP error code for l4_unmap.

docs/man/man7/l4_time.7

@@ -1,27 +1,44 @@
 .TH L4_TIME 7 2009-11-07 "Codezero" "Codezero Programmer's Manual"
 .SH NAME
 .nf
-.BR "l4_time" "- Sets or returns system time."
+.BR "l4_time" " - sets or reads system time."
 
 .SH SYNOPSIS
 .nf
 .B #include <l4lib/arch/syscalls.h>
 .B #include <l4lib/arch/syslib.h>
 
-.BI "int l4_time(void " "*timeval" ", int " "set" ");"
+.BI "int l4_time(struct timeval *" "timeval" ", int " "set" ");"
+
 .SH DESCRIPTION
-.BR l4_time() " - Sets or returns system time."
+.BR "l4_time() " "sets or reads system time. "
 
-System time is read in the 
-.B timeval 
-argument field.
+.IR "timeval " "field is the representation of time since the system has started running. See below for details."
 
-If 
-.B set
-argument is a non-zero value, system time is set using the values in 
-.B timeval
+.IR "set " " field instructs whether the time is to be read or set to the values specified in the " "timeval " "field supplied."
 
-Currently setting the time feature is disabled
+.nf
+.B struct timeval {
+.BI "      int " "tv_sec;"  "    /* Time value in seconds */ "
+.BI "      int " "tv_usec;" "   /* Time value in microseconds */ "
+.B };
+.fi
 
-Currently the system time is returned since the system has started rather than a set date.
+.SH LIMITATIONS
+- Currently setting the time feature is disabled.
+
+- Currently the system time is returned since the system has started rather than a set date.
+
+- Currently this system call is not subject to capabilities.
+
+.SH ERRORS
+.TP
+.B -EFAULT
+.IR "timeval " "field would cause an unhandled page fault."
+.TP
+.B -EBUSY
+Timer structures in the system are currently being used.
+.TP
+.B -ENOSYS
+Operation of given type is not supported.