.\" Copyright 2016, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Copyright 2016, Eugene Syromyatnikov <evgsyr@gmail.com>
.\" A very few fragments remain from an earlier version of this page
.\" written by David Howells (dhowells@redhat.com)
.\" Copyright 2024, Alejandro Colomar <alx@kernel.org>
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH KEYCTL_REVOKE 2const 2024-08-21 "Linux man-pages 6.10"
.SH NAME
KEYCTL_REVOKE
\-
revoke a key
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <linux/keyctl.h>" "  /* Definition of " KEY* " constants */"
.BR "#include <sys/syscall.h>" "   /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.P
.BI "long syscall(SYS_keyctl, KEYCTL_REVOKE, key_serial_t " key );
.fi
.SH DESCRIPTION
Revoke the key with the ID provided in
.IR key .
The key is scheduled for garbage collection;
it will no longer be findable,
and will be unavailable for further operations.
Further attempts to use the key will fail with the error
.BR EKEYREVOKED .
.P
The caller must have
.I write
or
.I setattr
permission on the key.
.\" Keys with the KEY_FLAG_KEEP bit set cause an EPERM
.\" error for KEYCTL_REVOKE. Does this need to be documented?
.\" David Howells: No significance for user space.
.SH RETURN VALUE
On success,
0 is returned.
.P
On error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH VERSIONS
A wrapper is provided in the
.I libkeyutils
library:
.BR keyctl_revoke (3).
.SH STANDARDS
Linux.
.SH HISTORY
Linux 2.6.10.
.SH SEE ALSO
.BR keyctl (2),
.BR keyctl_revoke (3)