SETRESUID

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
CONFORMING TO
SEE ALSO

NAME

setresuid, setresgid − set real, effective and saved user or group ID

SYNOPSIS

#include <unistd.h>

int setresuid(uid_t ruid, uid_t euid, uid_t suid);
int setresgid(gid_t
rgid, gid_t egid, gid_t sgid);

DESCRIPTION

setresuid (introduced in Linux 2.1.44) sets the real user ID, the effective user ID, and the saved set-user-ID of the current process.

Unprivileged user processes (i.e., processes with each of real, effective and saved user ID nonzero) may change the real, effective and saved user ID, each to one of: the current uid, the current effective uid or the current saved uid.

The super-user may set real, effective and saved user ID to arbitrary values.

If one of the parameters equals −1, the corresponding value is not changed.

Completely analogously, setresgid sets the real, effective and saved group ID’s of the current process, with the same restrictions for processes with each of real, effective and saved user ID nonzero.

RETURN VALUE

On success, zero is returned. On error, −1 is returned, and errno is set appropriately.

ERRORS

EPERM

The current process was not privileged and tried to change the IDs is a not allowed way.

CONFORMING TO

This call is Linux-specific.

SEE ALSO

getuid(2), setuid(2), getreuid(2), setreuid(2), getresuid(2)