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returns the serial number of the key it found or caused to be created.
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on error, \-1 is returned and
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.i errno
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is set to indicate the error.
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.sh errors
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.tp
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.b eacces
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the keyring wasn't available for modification by the user.
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.tp
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.b edquot
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the key quota for this user would be exceeded by creating this key or linking
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it to the keyring.
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.tp
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.b efault
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one of
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.ir type ,
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.ir description ,
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or
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.ir callout_info
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points outside the process's accessible address space.
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.tp
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.b eintr
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the request was interrupted by a signal; see
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.br signal (7).
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.tp
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.b einval
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the size of the string (including the terminating null byte) specified in
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.i type
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or
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.i description
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exceeded the limit (32 bytes and 4096 bytes respectively).
|
.tp
|
.b einval
|
the size of the string (including the terminating null byte) specified in
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.i callout_info
|
exceeded the system page size.
|
.tp
|
.b ekeyexpired
|
an expired key was found, but no replacement could be obtained.
|
.tp
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.b ekeyrejected
|
the attempt to generate a new key was rejected.
|
.tp
|
.b ekeyrevoked
|
a revoked key was found, but no replacement could be obtained.
|
.tp
|
.b enokey
|
no matching key was found.
|
.tp
|
.b enomem
|
insufficient memory to create a key.
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.tp
|
.b eperm
|
the
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.i type
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argument started with a period (\(aq.\(aq).
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.sh versions
|
this system call first appeared in linux 2.6.10.
|
the ability to instantiate keys upon request was added
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.\" commit 3e30148c3d524a9c1c63ca28261bc24c457eb07a
|
in linux 2.6.13.
|
.sh conforming to
|
this system call is a nonstandard linux extension.
|
.sh notes
|
glibc does not provide a wrapper for this system call.
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a wrapper is provided in the
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.ir libkeyutils
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library.
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(the accompanying package provides the
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.i <keyutils.h>
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header file.)
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when employing the wrapper in that library, link with
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.ir \-lkeyutils .
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.sh examples
|
the program below demonstrates the use of
|
.br request_key ().
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the
|
.ir type ,
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.ir description ,
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and
|
.ir callout_info
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arguments for the system call are taken from the values
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supplied in the command-line arguments.
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the call specifies the session keyring as the target keyring.
|
.pp
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in order to demonstrate this program,
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we first create a suitable entry in the file
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.ir /etc/request\-key.conf .
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.pp
|
.in +4n
|
.ex
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$ sudo sh
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# \fbecho \(aqcreate user mtk:* * /bin/keyctl instantiate %k %c %s\(aq \e\fp
|
\fb> /etc/request\-key.conf\fp
|
# \fbexit\fp
|
.ee
|
.in
|
.pp
|
this entry specifies that when a new "user" key with the prefix
|
"mtk:" must be instantiated, that task should be performed via the
|
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