arch_prctl.2 changes

@@ -21,24 +21,33 @@
 .\"
 .\" Formatted or processed versions of this manual, if unaccompanied by
 .\" the source, must acknowledge the copyright and authors of this work.
-.TH ARCH_PRCTL 2 2003-02-02 "Linux" "Linux Programmer's Manual"
+.TH ARCH_PRCTL 2 2007-12-26 "Linux" "Linux Programmer's Manual"
 .SH NAME
-arch_prctl \- set architecture specific thread state
+arch_prctl \- set architecture-specific thread state
 .SH SYNOPSIS
+.nf
 .B #include <asm/prctl.h>
 .br
 .B #include <sys/prctl.h>
 .sp
 .BI "int arch_prctl(int " code ", unsigned long " addr );
+.BI "int arch_prctl(int " code ", unsigned long *" addr );
+.fi
 .SH DESCRIPTION
 The
 .BR arch_prctl ()
-function sets architecture specific process or thread state.
+function sets architecture-specific process or thread state.
 .I code
 selects a subfunction
 and passes argument
 .I addr
-to it.
+to it;
+.I addr
+is interpreted as either an
+.I "unsigned long"
+for the "set" operations, or as an
+.IR "unsigned long *" ,
+for the "get" operations.
 .LP
 Sub functions for x86-64 are:
 .TP

@@ -53,9 +62,8 @@
 .I FS
 register of the current thread in the
 .I unsigned long
-pointed to by the
-.I address
-parameter.
+pointed to
+.IR addr .
 .TP
 .B ARCH_SET_GS
 Set the 64-bit base for the

@@ -68,11 +76,10 @@
 .I GS
 register of the current thread in the
 .I unsigned long
-pointed to by the
-.I address
-parameter.
+pointed to
+.IR addr .
 .SH RETURN VALUE
-On sucess,
+On success,
 .BR arch_prctl ()
 returns 0; on error, \-1 is returned, and
 .I errno

@@ -111,7 +118,7 @@
 .BR modify_ldt (2)
 or using the
 .BR set_thread_area (2)
-system call in a 2.5 kernel.
+system call in kernel 2.5 or later.
 .BR arch_prctl ()
 is only needed when you want to set bases that are larger than 4GB.
 Memory in the first 2GB of address space can be allocated by using

@@ -120,7 +127,7 @@
 .B MAP_32BIT
 flag.
 
-As of version 2.3.5, glibc provides no prototype for
+As of version 2.7, glibc provides no prototype for
 .BR arch_prctl ().
 You have to declare it yourself for now.
 This may be fixed in future glibc versions.