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KEYCTL_SET_TIMEOUT(2const) — Linux manual page

KEYCTL_SET_TIMEOUT(2const)KEYCTL_SET_TIMEOUT(2const)

NAME        top

       KEYCTL_SET_TIMEOUT - set the expiration timer on a key

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <linux/keyctl.h>/* Definition ofKEY*constants */#include <sys/syscall.h>/* Definition ofSYS_*constants */#include <unistd.h>long syscall(SYS_keyctl, KEYCTL_SET_TIMEOUT, key_serial_tkey, time_tt);

DESCRIPTION        top

       Set a timeout on a key.       The ID of the key is specified inkey.  The timeout value, in       seconds from the current time, is specified int.  The timeout is       measured against the realtime clock.       Specifying the timeout value as 0 clears any existing timeout on       the key.       The/proc/keys file displays the remaining time until each key       will expire.  (This is the only method of discovering the timeout       on a key.)       The caller must either have thesetattr permission on the key or       hold an instantiation authorization token for the key (seerequest_key(2)).       The key and any links to the key will be automatically garbage       collected after the timeout expires.  Subsequent attempts to       access the key will then fail with the errorEKEYEXPIRED.       This operation cannot be used to set timeouts on revoked, expired,       or negatively instantiated keys.

RETURN VALUE        top

       On success, 0 is returned.       On error, -1 is returned, anderrno is set to indicate the error.

VERSIONS        top

       A wrapper is provided in thelibkeyutils library:keyctl_set_timeout(3).

STANDARDS        top

       Linux.

HISTORY        top

       Linux 2.6.16.

SEE ALSO        top

keyctl(2),keyctl_set_timeout(3)

COLOPHON        top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17KEYCTL_SET_TIMEOUT(2const)

Pages that refer to this page:keyctl(2)

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