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NetBSD 6.1.5 - man page for nullop (netbsd section 9)

NULLOP(9)			  BSD Kernel Developer's Manual 			NULLOP(9)

NAME
     nullop -- dummy functions

SYNOPSIS
     #include <sys/systm.h>

     int
     nullop(void *v);

     void
     voidop(void);

     int
     enodev(void);

     int
     enxio(void);

     int
     enoioctl(void);

     int
     enosys(void);

     int
     eopnotsupp(void);

DESCRIPTION
     The nullop() function provides a generic ``null operation''.  It always returns the value 0.
     The voidop() function takes no arguments and does nothing.

     The enodev(), enxio(), enoioctl(), enosys(), and eopnotsupp() functions always fail, return-
     ing ENODEV, ENXIO, ENOTTY, ENOSYS, and EOPNOTSUPP, respectively.

EXAMPLES
     The following example demonstrates a case where nullop() may be useful:

	   uint64_t xc;

	   ...

	   xc = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL);
	   xc_wait(xc);

BSD					  July 25, 2010 				      BSD


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