NS_GET_OWNER_UID(2const) NS_GET_OWNER_UID(2const)
NAME
NS_GET_OWNER_UID - discovering the owner of a user namespace
SYNOPSIS
#include <linux/nsfs.h> /* Definition of NS_GET_OWNER_UID */
#include <sys/ioctl.h>
int ioctl(int fd, NS_GET_OWNER_UID, uid_t *uid);
DESCRIPTION
The NS_GET_OWNER_UID operation can be used to discover the owner user ID
of a user namespace (i.e., the effective user ID of the process that
created the user namespace).
fd refers to a /proc/pid/ns/user file.
The owner user ID is returned in the uid_t pointed to by the third argu-
ment.
RETURN VALUE
On success, 0 is returned. On error, -1 is returned, and errno is set
to indicate the error.
ERRORS
EINVAL fd does not refer to a user namespace.
STANDARDS
Linux.
HISTORY
Linux 4.11.
SEE ALSO
ioctl(2), ioctl_nsfs(2)
Linux man-pages 6.9.1 2024-06-13 NS_GET_OWNER_UID(2const)
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