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getsockopt.2: EINVAL can also occur if 'optval' is invalid 

In some cases, EINVAL can occur if 'optval' is invalid.
Note this, and point reader to an example in ip(7).
In response to:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=216092

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Christian Grigis <glove@earthling.net>
This commit is contained in:
Michael Kerrisk 2008-10-28 14:01:19 -05:00
parent 6dd5c68a3d
commit 71b2fb380d
1 changed files with 7 additions and 1 deletions
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8
man2/getsockopt.2
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@ -39,7 +39,7 @@
.\" Modified 1999 by Andi Kleen <ak@muc.de>.
.\" Removed most stuff because it is in socket.7 now.
.\"
.TH GETSOCKOPT 2 1999-05-24 "Linux" "Linux Programmer's Manual"
.TH GETSOCKOPT 2 2008-10-28 "Linux" "Linux Programmer's Manual"
.SH NAME
getsockopt, setsockopt \- get and set options on sockets
.SH SYNOPSIS
@ -154,6 +154,12 @@ is not in a valid part of the process address space.
.I optlen
invalid in
.BR setsockopt ().
In some cases this error can also occur for an invalid value in
.IR optval
(e.g., for the
.B IP_ADD_MEMBERSHIP
option described in
.BR ip (7)).
.TP
.B ENOPROTOOPT
The option is unknown at the level indicated.