SETRUID(3)             FreeBSD Library Functions Manual             SETRUID(3)

NAME
     setruid, setrgid - set user and group ID

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     setruid(uid_t ruid);

     int
     setrgid(gid_t rgid);

DESCRIPTION
     The setruid() function (setrgid()) sets the real user ID (group ID) of
     the current process.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

COMPATIBILITY
     The use of these calls is not portable.  Their use is discouraged; they
     will be removed in the future.

ERRORS
     The functions fail if:

     [EPERM]            The user is not the super user and the ID specified is
                        not the real or effective ID.

SEE ALSO
     getgid(2), getuid(2), setegid(2), seteuid(2), setgid(2), setuid(2)

HISTORY
     The setruid() and setrgid() syscalls appeared in 4.2BSD and were dropped
     in 4.4BSD.

FreeBSD 13.1-RELEASE-p6          June 2, 1993          FreeBSD 13.1-RELEASE-p6