.I segbrk
with a zero
.I addr
-argument returns the address
-of the top of bss.
+argument returns the base address of the segment without
+altering its size.
.PP
The system will prevent segments from overlapping and will not allow the
length of the
.B (void*)-1
on error.
.SH BUGS
-.I Segbrk
-is not fully defined or implemented.
-In particular,
-it cannot always return the top of bss
-when called with a zero
-.I addr
-argument.
The
.I segbrk
system call may go away or be re-implemented