stdio.3: Note down fmemopen(3), fopencookie(3), and open_[w]memstream(3)

I was looking for fmemopen() to remember I was actually looking for
open_memstream(), and it was much more difficult than it ought to've
been.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/man3/stdio.3 b/man3/stdio.3
index 833230402..0809b4536 100644
--- a/man3/stdio.3
+++ b/man3/stdio.3
@@ -192,9 +192,15 @@ T}
 \fBfileno\fP(3)	T{
 return the integer descriptor of the argument stream
 T}
+\fBfmemopen\fP(3)	T{
+open memory as stream
+T}
 \fBfopen\fP(3)	T{
 stream open functions
 T}
+\fBfopencookie\fP(3)	T{
+opening a custom stream
+T}
 \fBfprintf\fP(3)	T{
 formatted output conversion
 T}
@@ -243,6 +249,12 @@ T}
 \fBmktemp\fP(3)	T{
 make temporary filename (unique)
 T}
+\fBopen_memstream\fP(3)	T{
+open a dynamic memory buffer stream
+T}
+\fBopen_wmemstream\fP(3)	T{
+open a dynamic memory buffer stream
+T}
 \fBperror\fP(3)	T{
 system error messages
 T}