man/man2/setregid.2

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 setregid 2 "22 Mar 2004" "SunOS 5.11" "System Calls"
 NAME
setregid - set real and effective group IDs
 SYNOPSIS

#include <unistd.h>

int setregid(gid_t rgid, gid_t egid);


 DESCRIPTION

The setregid() function is used to set the real and effective group IDs
of the calling process. If rgid is -1, the real group ID is not
changed; if egid is -1, the effective group ID is not changed. The
real and effective group IDs may be set to different values in the same call.

If the {PRIV_PROC_SETID} privilege is asserted in the effective set of
the calling process, the real group ID and the effective group ID can be set to
any legal value.

If the {PRIV_PROC_SETID} privilege is not asserted in the effective set
of the calling process, either the real group ID can be set to the saved
set-group-ID from execve(2), or the effective group ID can either be set
to the saved set-group-ID or the real group ID.

In either case, if the real group ID is being changed (that is, if rgid
is not -1), or the effective group ID is being changed to a value not equal
to the real group ID, the saved set-group-ID is set equal to the new effective
group ID.
 RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned,
errno is set to indicate the error, and neither of the group IDs will be
changed.
 ERRORS

The setregid() function will fail if:

EINVAL

The value of rgid or egid is less than 0 or greater than
UID_MAX (defined in <limits.h>).


EPERM

The {PRIV_PROC_SETID} privilege is not asserted in the effective set of
the calling processes and a change was specified other than changing the real
group ID to the saved set-group-ID or changing the effective group
ID to the real group ID or the saved group ID.


 USAGE

If a set-group-ID process sets its effective group ID to its real
group ID, it can still set its effective group ID back to the saved
set-group-ID.
 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard


 SEE ALSO

execve(2), getgid(2), setreuid(2), setuid(2),
attributes(5), privileges(5), standards(5)