.\"
.\" Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
.\" Written by David Howells (dhowells@redhat.com)
.\"
.\" This program is free software; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License
.\" as published by the Free Software Foundation; either version
.\" 2 of the License, or (at your option) any later version.
.\"
.TH KEYCTL_JOIN_SESSION_KEYRING 3 "20 Feb 2014" Linux "Linux Key Management Calls"
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.SH NAME
keyctl_join_session_keyring \- Join a different session keyring
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.SH SYNOPSIS
.nf
.B #include <keyutils.h>
.sp
.BI "key_serial_t keyctl_join_session_keyring(const char *" name ");"
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.SH DESCRIPTION
.BR keyctl_join_session_keyring ()
changes the session keyring to which a process is subscribed.
.P
If
.I name
is
.B NULL
then a new anonymous keyring will be created, and the process will be
subscribed to that.
.P
If
.I name
points to a string, then if a keyring of that name is available, the process
will attempt to subscribe to that keyring, giving an error if that is not
permitted; otherwise a new keyring of that name is created and attached as the
session keyring.
.P
To attach to an extant named keyring, the keyring must have
.B search
permission available to the calling process.
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.SH RETURN VALUE
On success
.BR keyctl_join_session_keyring ()
returns the serial number of the key it found or created.  On error, the value
.B -1
will be returned and errno will have been set to an appropriate error.
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.SH ERRORS
.TP
.B ENOMEM
Insufficient memory to create a key.
.TP
.B EDQUOT
The key quota for this user would be exceeded by creating this key or linking
it to the keyring.
.TP
.B EACCES
The named keyring exists, but is not
.B searchable
by the calling process.
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.SH LINKING
This is a library function that can be found in
.IR libkeyutils .
When linking,
.B -lkeyutils
should be specified to the linker.
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.SH SEE ALSO
.BR keyctl (1),
.br
.BR add_key (2),
.br
.BR keyctl (2),
.br
.BR request_key (2),
.br
.BR keyctl (3),
.br
.BR session-keyring (7),
.br
.BR user-session-keyring (7),
.br
.BR keyutils (7),
.br
.BR keyrings (7)