LIBCASPER(3)           FreeBSD Library Functions Manual           LIBCASPER(3)

NAME
     CREATE_SERVICE - casper service declaration macro

LIBRARY
     Casper Library (libcasper, -lcasper)

SYNOPSIS
     #include <sys/nv.h>
     #include <libcasper.h>
     #include <libcasper_service.h>

     typedef int service_limit_func_t(const nvlist_t *, const nvlist_t *);

     typedef int service_command_func_t(const char *, const nvlist_t *, nvlist_t *,
         nvlist_t *);

     CREATE_SERVICE(name, limit_func, command_func, flags);

DESCRIPTION
     The CREATE_SERVICE macro to create a new Casper service.  The name is a
     string containing the service name, which will be used in the
     cap_service_open(3), function to identify it.

     The limit_func is a function of type service_limit_func_t.  The first
     argument of the function contains nvlist(9), old service limits and
     second one the new limits.  If the services wasn't limited the old limits
     will be set to NULL.  This function should not allow to extend service
     limits and only limit it further.  The command_func is a function of type
     service_command_func_t.  First argument is the name of the command that
     should be executed.  The first nvlist(9) contains the current limits.
     Next one contains a nvlist(9) with current request.  The last one
     contains an output nvlist(9) which contains the response from Casper.

     The flags argument defines limits of the service.  The supported flags
     are:

           CASPER_SERVICE_STDIO
           The Casper service has access to the stdio descriptors from the
           process it was spawned from.

           CASPER_SERVICE_FD
           The Casper service has access to all descriptors besides stdio
           descriptors from the process it was spawned from.

           CASPER_SERVICE_NO_UNIQ_LIMITS
           The whole Casper communication is using nvlist(9) with
           NVLIST_NO_UNIQ(9) flag.

SEE ALSO
     cap_enter(2), libcasper(3), capsicum(4), nv(9)

HISTORY
     The libcasper library first appeared in FreeBSD 10.3.

AUTHORS
     The libcasper library was implemented by Pawel Jakub Dawidek
     <pawel@dawidek.net> under sponsorship from the FreeBSD Foundation.  The
     libcasper new architecture was implemented by
     Mariusz Zaborski <oshogbo@FreeBSD.org>

FreeBSD 13.1-RELEASE-p6           May 5, 2020          FreeBSD 13.1-RELEASE-p6