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unix.7: Add a detail on autobind feature 

Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2012-04-16 09:05:00 +12:00
parent 486fccf2e7
commit 1e4e3badf3
1 changed files with 5 additions and 2 deletions
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7
man7/unix.7
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@ -12,7 +12,7 @@
.\" address that can appear in the sockaddr_un structure: pathname,
.\" unnamed, and abstract.
.\"
.TH UNIX 7 2011-09-15 "Linux" "Linux Programmer's Manual"
.TH UNIX 7 2102-04-16 "Linux" "Linux Programmer's Manual"
.SH NAME
unix, AF_UNIX, AF_LOCAL \- Sockets for local
interprocess communication
@ -166,7 +166,10 @@ then the socket is autobound to an abstract address.
The address consists of a null byte
followed by 5 bytes in the character set
.IR [0-9a-f] .
(Thus, there is a limit of 2^20 autobind addresses.)
Thus, there is a limit of 2^20 autobind addresses.
(From Linux 2.1.15, when the autobind feature was added,
8 bytes were used, and the limit was thus 2^32 autobind addresses.
The change to 5 bytes came in Linux 2.3.15.)
.SS Sockets API
The following paragraphs describe domain-specific details and
unsupported features of the sockets API for UNIX domain sockets on Linux.