HP-UX Reference (11i v3 07/02) - 2 System Calls (vol 5)

setreuid(2) setreuid(2)

NAME

setreuid - set real and effective user IDs

SYNOPSIS

#include <unistd.h>

int setreuid(uid_t ruid, uid_t euid);

DESCRIPTION

The setreuid() function sets the real and effective user IDs of the current process to the values

speciﬁed by the ruid and euid arguments. If ruid or euid is −1, the corresponding effective or real user ID of

the current process is left unchanged.

A process with appropriate privileges can set either ID to any value. An unprivileged process can only set

the effective user ID if the euid argument is equal to either the real, effective, or saved user ID of the pro-

cess.

It is unspeciﬁed whether a process without appropriate privileges is permitted to change the real user ID to

match the current real, effective or saved user ID of the process.

RETURN VALUE

Upon successful completion, 0 is returned. Otherwise, −1 is returned and

errno is set to indicate the

error.

ERRORS

The setreuid() function will fail if:

[EINVAL] The value of the ruid or euid argument is invalid or out-of-range.

[EPERM] The current process does not have appropriate privileges, and either an

attempt was made to change the effective user ID to a value other than the

real user ID or the saved set-user-ID or an attempt was made to change

the real user ID to a value not permitted by the implementation.