SYSCALL_MODULE(9)      FreeBSD Kernel Developer's Manual     SYSCALL_MODULE(9)

NAME
     SYSCALL_MODULE - syscall kernel module declaration macro

SYNOPSIS
     #include <sys/param.h>
     #include <sys/kernel.h>
     #include <sys/proc.h>
     #include <sys/module.h>
     #include <sys/sysent.h>

     SYSCALL_MODULE(name, int *offset, struct sysent *new_sysent,
         modeventhand_t evh, void *arg);

DESCRIPTION
     The SYSCALL_MODULE() macro declares a new syscall.  SYSCALL_MODULE()
     expands into a kernel module declaration with name `sys/name'.

     The rest of the arguments expected by this macro are:

     offset          A pointer to an int which saves the offset in struct
                     sysent where the syscall is allocated.  If the location
                     pointed to by offset holds a non 0 number it will be used
                     if possible.  If it holds 0 then one will be assigned.

     new_sysent      is a pointer to a structure that specifies the function
                     implementing the syscall and the number of arguments this
                     function needs (see <sys/sysent.h>).

     evh             A pointer to the kernel module event handler function
                     with the argument arg.  Please refer to module(9) for
                     more information.

     arg             The argument passed to the callback functions of the evh
                     event handler when it is called.

     The syscall number assigned to the module can be retrieved using the
     modstat(3) and modfind(3) library functions in libc.  The MACRO
     SYSCALL_MODULE_HELPER() includes SYSCALL_MODULE() and much of its
     boilerplate code.

EXAMPLES
     A minimal example for a syscall module can be found in
     /usr/share/examples/kld/syscall/module/syscall.c.

SEE ALSO
     module(9)

     /usr/share/examples/kld/syscall/module/syscall.c

AUTHORS
     This manual page was written by Alexander Langer <alex@FreeBSD.org>.

FreeBSD 13.1-RELEASE-p6        January 24, 2015        FreeBSD 13.1-RELEASE-p6