GETAUID(2) System Calls Manual GETAUID(2)
getauid, setauid - get and set user audit identity
The getauid() system call returns the audit user ID for the current
process. This value is initially set at login time and inherited by
all child processes. This value does not change when the real/effec-
tive user IDs change, so it can be used to identify the logged-in user,
even when running a setuid program. The audit user ID governs audit
decisions for a process.
The setauid() system call sets the audit user ID for the current
process. Only the super-user may successfully execute these calls.
getauid() returns the audit user ID of the current process on success.
On failure, it returns -1 and sets errno to indicate the error.
0 on success.
-1 on failure and sets errno to indicate the error.
EINVAL The parameter auid is not a valid UID.
EPERM The process's effective user ID is not super-user.
getuid(2V), setuseraudit(2), audit(8)
21 January 1990 GETAUID(2)