NS_GET_OWNER_UID2const
Discovering the owner of a user namespace
Usage
#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);
Overview
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 argument.
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.
Releases
2 releases since Debian 13 (Trixie); the text changed 1 time.