Provided by: manpages-pl-dev_20051117-1_all
setresuid, setresgid - set real, effective and saved user or group ID
int setresuid(uid_t ruid, uid_t euid, uid_t suid);
int setresgid(gid_t rgid, gid_t egid, gid_t sgid);
setresuid 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
If one of the parameters equals -1, the corresponding value is not
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.
On success, zero is returned. On error, -1 is returned, and errno is
EPERM The current process was not privileged and tried to change the
IDs is a not allowed way.
This call is nonstandard.
This system call was first introduced in HP-UX. It is available under
Linux since Linux 2.1.44. These days it is also found in FreeBSD (for
emulation of Linux binaries).
Under HP-UX and FreeBSD the prototype is found in <unistd.h>. Under
Linux there is so far no include file giving the prototype - this is a
glibc bug. Programs using this system call must add the prototype
getuid(2), setuid(2), setreuid(2), getresuid(2)