Sample wrapper code

The following coding examples show some typical wrappers for the different loadable module types. Note that all loadable modules must include <sys/moddefs.h> in their wrapper definitions.

``Generic device driver wrapper coding example'' shows a sample wrapper for a device driver.

Generic device driver wrapper coding example

#include        <sys/moddefs.h>

        .
        .
        .

#define         DRVNAME         "fd - Floppy disk driver"

STATIC  int     fd_load(), fd_unload();

MOD_DRV_WRAPPER(fd, fd_load, fd_unload, NULL, DRVNAME);

STATIC  int
fd_load()
{
        fdinit();
        mod_drvattach(&fd_attach_info);
        fdstart();

        return(0);
}

STATIC  int
fd_unload()
{
        mod_drvdetach(&fd_attach_info);

        .
        .
        .

        return(0);
}

``File system module wrapper coding example'' shows a sample wrapper for a file system module. Notice that this file system module does not need to do any clean-up when it is unloaded, so its wrapper defines a NULL _unload( ) routine.

File system module wrapper coding example

   #include        <sys/moddefs.h>
   

   STATIC int s5_load(void);
   

   MOD_FS_WRAPPER(s5, s5_load, NULL, "Loadable s5 FS Type");
   

   STATIC int
   s5_load(void)
   {
          
           inoinit();
   

           bzero((caddr_t)&s5fshead, sizeof(s5fshead));
           s5fshead.f_freelist = &s5ifreelist;
           s5fshead.f_inode_cleanup = s5_cleanup;
           s5fshead.f_maxpages = 1;
           s5fshead.f_isize = sizeof (struct inode);
           s5fshead.f_max = ninode;
   

           fs_ipoolinit(&s5fshead);
           return 0;
   }

``Miscellaneous module wrapper coding example'' shows a sample wrapper for a miscellaneous module. Notice that, once loaded, this module wants to remain loaded, so its _unload( ) routine always returns EBUSY.

Miscellaneous module wrapper coding example

#include        <sys/moddefs.h>

STATIC  int     clis_load(), clis_unload();

MOD_MISC_WRAPPER(clis, clis_load, clis_unload, "clist - character io");
        .
        .
        .

STATIC int
clis_load()
{
        .
        .
        .

        cinit();
        return(0);
}

STATIC int
clis_unload()
{
        /*
         * This module can not be unloaded.
         */
        return(EBUSY);
}