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LEARN ABOUT OSX

mbr_check_service_membership

MBR_CHECK_MEMBERSHIP(3) 				   BSD Library Functions Manual 				   MBR_CHECK_MEMBERSHIP(3)

NAME

     mbr_check_membership, mbr_check_service_membership -- check whether a user is a member of a group or service ACL

SYNOPSIS

     #include <membership.h>

     int
     mbr_check_membership(uuid_t user, uuid_t group, int *ismember);

     int
     mbr_check_service_membership(uuid_t user, const char *service, int *ismember);

DESCRIPTION

     mbr_check_membership() tests if a given user is a member of a group (either direct or indirect via a nested group).  ismember is set to 1 if
     the user is a member or 0 if not a member of the group.  mbr_check_service_membership() similarly tests if a given user is a member of a ser-
     vice ACL group.  Service ACLs are special groups defined with the prefix "com.apple.access_".  The service is then prefixed (e.g., "afp"
     would check "com.apple.access_afp").  There is a special group that grants accessto all services called "com.apple.access_all_services".

     Users may belong to any number of groups.	mbr_check_membership() should always be used to check group membership, rather than calling
     getgroups(2) or getgrouplist(2).  The setgroups(2) and getgroups(2) routines are limited to a fixed number of gids, and so may not include
     all of a user's groups.

     There are two special cases.  If the two uuids are equal, then ismember is set to 1.  If the group uuid is equal to the reserved "everyone"
     uuid (ABCDEFAB-CDEF-ABCD-EFAB-CDEF0000000C), then ismember will be set to 1 for any valid user.

     Group membership information is managed by opendirectoryd(8).

RETURN VALUES

     mbr_check_membership() does not test whether group exists or not.	Querying membership for a nonexistent group will result in ismember being
     set to 0.	The function returns 0 on success or one of the following error codes on failure:

     [EIO]		Communication with openditectoryd(8) failed.

     [ENOENT]		user can not be found.

     mbr_check_service_membership() is identical to mbr_check_membership() except that ENOENT means no service ACL has been defined.

SEE ALSO

     odutil(1), setgroups(2), getgroups(2), mbr_uid_to_uuid(3), opendirectoryd(8)

Mac OS X							 November 5, 2011							  Mac OS X