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NAME
     tt_message_gid - retrieve  the  group  identifier  attribute
     from a message

SYNOPSIS
     #include <Tt/tt_c.h>
     gid_t tt_message_gid(Tt_message m);

DESCRIPTION
     The tt_message_gid() function retrieves the group identifier
     attribute from the specified message.

     The ToolTalk service automatically sets the group identifier
     of  a  message with the group identifier of the process that
     created the message.

     The m argument is the opaque handle for the message involved
     in this operation.

     The  application  should  check  the  tt_message_uid(3)  and
     tt_message_gid()  against  the  User  ID and Group ID of the
     application receiving the messsage. If the UID and/or GID of
     the  application  do  not match that of the message then the
     receiving application should consider  failing  the  message
     with TT_DESKTOP_EACCES.

RETURN VALUE
     Upon successful completion,  the  tt_message_gid()  function
     returns  the  group identifier of the message.  If the group
     nobody is returned, the message handle is not valid.

SEE ALSO
     tt_c(5), tt_message_uid(3).

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