KEYCTL_SESSION_TO_PARENT(2const) - Linux manual page (original) (raw)

KEYCTLSESSIONTOPARENT(2const) KEYCTLSESSIONTOPARENT(2const)

NAME top

   KEYCTL_SESSION_TO_PARENT - set the parent process's session
   keyring

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <linux/keyctl.h>** /* Definition of **KEY*** constants */
   **#include <sys/syscall.h>** /* Definition of **SYS_*** constants */
   **#include <unistd.h>**

   **long**_syscall(SYSkeyctl,_**KEYCTL_SESSION_TO_PARENT);**

DESCRIPTION top

   Replace the session keyring to which the _parent_ of the calling
   process subscribes with the session keyring of the calling
   process.

   The keyring will be replaced in the parent process at the point
   where the parent next transitions from kernel space to user space.

   The keyring must exist and must grant the caller _link_ permission.
   The parent process must be single-threaded and have the same
   effective ownership as this process and must not be set-user-ID or
   set-group-ID.  The UID of the parent process's existing session
   keyring (f it has one), as well as the UID of the caller's session
   keyring much match the caller's effective UID.

   The fact that it is the parent process that is affected by this
   operation allows a program such as the shell to start a child
   process that uses this operation to change the shell's session
   keyring.  (This is what the [keyctl(1)](../man1/keyctl.1.html) **new_session** command does.)

RETURN VALUE top

   On success, 0 is returned.

   On error, -1 is returned, and _[errno](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **EPERM** All of the UIDs (GIDs) of the parent process do not match
          the effective UID (GID) of the calling process.

   **EPERM** The UID of the parent's existing session keyring or the UID
          of the caller's session keyring did not match the effective
          UID of the caller.

   **EPERM** The parent process is not single-threaded.

   **EPERM** The parent process is [init(1)](../man1/init.1.html) or a kernel thread.

VERSIONS top

   A wrapper is provided in the _libkeyutils_ library:
   [keyctl_session_to_parent(3)](../man3/keyctl%5Fsession%5Fto%5Fparent.3.html).

STANDARDS top

   Linux.

HISTORY top

   Linux 2.6.32.

SEE ALSO top

   [keyctl(2)](../man2/keyctl.2.html), [keyctl_session_to_parent(3)](../man3/keyctl%5Fsession%5Fto%5Fparent.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-08-21KEYCTLSESSIONTOPARENT(2const)

Pages that refer to this page:keyctl(2), KEYCTL_SETPERM(2const)