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unix.7: Document the autobind feature 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2010-10-10 07:47:14 +02:00
parent 6ed236d51a
commit 0cf2caa41e
1 changed files with 17 additions and 0 deletions
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man7/unix.7
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@ -150,6 +150,23 @@ ancillary message.
When this option is set and the socket is not yet connected
a unique name in the abstract namespace will be generated automatically.
Expects an integer boolean flag.
.SS Autobind Feature
If a
.BR bind ()
call specifies
.I addrlen
as
.IR sizeof(sa_family_t) ,
.\" i.e. sizeof(short)
or the
.BR SO_PASSCRED
socket option was specified for a socket that was
not explicitly bound to an address,
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.)
.SS Sockets API
The following paragraphs describe domain-specific details and
unsupported features of the sockets API for Unix domain sockets on Linux.