setregid(2) - NetBSD Manual Pages

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SETREGID(2)               NetBSD Programmer's Manual               SETREGID(2)


NAME

     setregid - set real and effective group ID's


SYNOPSIS

     #include <unistd.h>

     int
     setregid(gid_t rgid, gid_t egid);


DESCRIPTION

     The real and effective group ID's of the current process are set accord-
     ing to the arguments.  If the real group ID is changed, the saved group
     ID is changed to the new value of the effective group ID.

     If rgid or egid is -1, the current gid is filled in by the system.  Un-
     privileged users may change the real group ID to the effective group ID,
     and may change the effective group ID to the real group ID or the saved
     group ID; only the super-user may make other changes.

     The setregid() function has been used to swap 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() function (see setuid(2)).

     When setting the real and effective group IDs to the same value, this
     function is equivalent to the setgid() function.  When setting only the
     effective group ID, this function is equivalent to the setegid() func-
     tion.


RETURN VALUES

     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and errno is set to indicate the error.


ERRORS

     [EPERM]       The current process is not the super-user and a change oth-
                   er than changing the effective group-id to the real group-
                   id was specified.


SEE ALSO

     getgid(2), setegid(2), setgid(2), setuid(2)


HISTORY

     The setregid() function call appeared in 4.2BSD and was dropped in
     4.4BSD.  It was reimplemented in NetBSD 1.2 in a way compatible with
     4.3BSD, SunOS and Linux.

NetBSD 1.4                       June 23, 1996                               1