4.3BSD/usr/man/man3/setuid.3

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.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved.  The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\"
.\"	@(#)setuid.3	6.3 (Berkeley) 5/12/86
.\"
.TH SETUID 3 "May 12, 1986" 
.UC 5
.SH NAME
setuid, seteuid, setruid, setgid, setegid, setrgid \- set user and group ID
.SH SYNOPSIS
.nf
.ft B
#include <sys/types.h>
.PP
.ft B
.nf
setuid(uid)
seteuid(euid)
setruid(ruid)
uid_t uid, euid, ruid;
.PP
.ft B
.nf
setgid(gid)
setegid(egid)
setrgid(rgid)
gid_t gid, egid, rgid;
.fi
.SH DESCRIPTION
.I Setuid
.RI ( setgid )
sets both the real and effective
user ID (group ID) of the current process to
as specified.
.PP
.I Seteuid
.RI ( setegid )
sets the effective user ID (group ID) of the
current process.
.PP
.I Setruid
.RI ( setrgid )
sets the real user ID (group ID) of the
current process.
.PP
These calls are only permitted to the super-user
or if the argument is the real or effective ID.
.SH "SEE ALSO"
setreuid(2), setregid(2), getuid(2), getgid(2)
.SH DIAGNOSTICS
Zero is returned if the user (group) ID is set;
\-1 is returned otherwise.