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SETREGID(2)                 BSD System Calls Manual                SETREGID(2)

     setregid -- set real and effective group IDs

     #include <&lt;unistd.h>&gt;

     setregid(gid_t rgid, gid_t egid);

     The real and effective group IDs of the current process are set according
     to the arguments.  The saved group ID will be set to the new value of the
     real group ID if a real group ID is specified and either the new real
     group ID value is different from the current value or the new value of
     the effective group ID differs from the current saved group ID.

     Unprivileged users may change either group ID to the current value of the
     real, effective, or saved group ID.  Only the superuser may make other

     Supplying a value of -1 for either the real or effective group ID forces
     the system to substitute the current ID in place of the -1 parameter.

     The setregid() function was intended to allow swapping the real and
     effective group IDs in set-group-ID programs to temporarily relinquish
     the set-group-ID value.  This purpose is now better served by the use of
     the setegid(2) function.

     When setting the real and effective group IDs to the same value, the
     setgid(2) function is preferred.

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

     [EPERM]            The current process is not the superuser and a change
                        other than changing the effective group ID to the real
                        group ID was specified.

     getgid(2), setegid(2), setgid(2), setresgid(2), setreuid(2)

     The setregid() function conforms to the IEEE Std 1003.1-2008
     (``POSIX.1'') specification, except that the conditions for changing the
     saved group ID differ and that, if it is changed, the saved group ID is
     set to the real group ID instead of the effective group ID.

     The setregid() system call first appeared in 4.1cBSD, predating POSIX.  A
     semantically different version appeared in 4.4BSD.  The current version,
     with the original semantics restored, appeared in OpenBSD 3.3.

BSD                             April 28, 2017                             BSD