Document 'm' (mmap) flag.

Document 'c' (notcancel) flag.

man3/fopen.3

@@ -39,7 +39,7 @@
 .\" Modified, aeb, 960421, 970806
 .\" Modified, joey, aeb, 2002-01-03
 .\"
-.TH FOPEN 3  2002-01-03 "BSD MANPAGE" "Linux Programmer's Manual"
+.TH FOPEN 3  2006-05-04 "BSD MANPAGE" "Linux Programmer's Manual"
 .SH NAME
 fopen, fdopen, freopen \- stream open functions
 .SH SYNOPSIS
@@ -230,10 +230,28 @@ functions conform to ANSI X3.159-1989 (``ANSI C'').  The
 .BR fdopen ()
 function conforms to IEEE Std1003.1-1988 (``POSIX.1'').
 .SH "GLIBC EXTENSIONS"
-The GNU C libary allows the following extension for the string specified in
+The GNU C libary allows the following extensions for the string specified in
 .IR mode :
 .TP
+.BR c " (since glibc 2.3.3)"
+Do not make the open operation, 
+or subsequent read and write operations,
+thread cancellation points.
+.TP
+.BR m " (since glibc 2.3)"
+Attempt to access the file using 
+.BR mmap (2),
+rather than I/O system calls 
+.RB ( read (2),
+.BR write (2)).
+Currently, 
+.\" As at glibc 2.4:
+this
+.BR mmap (2)
+is only used for a file opened for reading.
+.TP
 .B x
+.\" Since glibc 2.1?
 Open the file exclusively
 (like the 
 .B O_EXCL
@@ -245,6 +263,8 @@ fails, and sets
 .I errno
 to
 .BR EEXIST .
+This flag is ignored for
+.BR fdopen ().
 .\" FIXME document /,ccs= charset/
 .SH "SEE ALSO"
 .BR open (2),