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 is used 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 where the first
     argument of the function contains an nvlist(9), old service limits and
     the second argument contains the new limits.  If the service was not
     limited then the old limits will be set to NULL.  This function must not
     allow the extension of service limits.  The command_func is a function of
     type service_command_func_t where the first argument is the name of the
     command that should be executed.  The first nvlist(9) contains the
     current limits and the second contains an nvlist(9) with the current
     request.  The last argument contains a return value nvlist(9) which
     contains the response from casper.

     The flags argument defines the 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 of the descriptors, besides
           the stdio descriptors, from the process it was spawned from.

           CASPER_SERVICE_NO_UNIQ_LIMITS
           The whole casper communication is using an nvlist(9) with the
           NV_FLAG_NO_UNIQUE 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 15.1-STABLE-HBSD       November 15, 2021                  LIBCASPER(3)