xdr_skb_read_bits(9) [centos man page]

XDR_SKB_READ_BITS(9)						 Linux Networking					      XDR_SKB_READ_BITS(9)

NAME

       xdr_skb_read_bits - copy some data bits from skb to internal buffer

SYNOPSIS

       size_t xdr_skb_read_bits(struct xdr_skb_reader * desc, void * to, size_t len);

ARGUMENTS

       desc
	   sk_buff copy helper

       to
	   copy destination

       len
	   number of bytes to copy

DESCRIPTION

       Possibly called several times to iterate over an sk_buff and copy data out of it.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      XDR_SKB_READ_BITS(9)

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

NAME

     copy, copyin, copyinstr, copyout, copystr -- kernel copy functions

SYNOPSIS

     #include <sys/types.h>
     #include <sys/systm.h>

     int
     copyin(const void *uaddr, void *kaddr, size_t len);

     int
     copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done);

     int
     copyout(const void *kaddr, void *uaddr, size_t len);

     int
     copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done);

DESCRIPTION

     The copy functions are designed to copy contiguous data from one address to another.  All but copystr() copy data from user-space to kernel-
     space or vice-versa.

     The copy routines provide the following functionality:

     copyin()	   Copies len bytes of data from the user-space address uaddr to the kernel-space address kaddr.

     copyinstr()   Copies a NUL-terminated string, at most len bytes long, from user-space address uaddr to kernel-space address kaddr.  The num-
		   ber of bytes actually copied, including the terminating NUL, is returned in *done.

     copyout()	   Copies len bytes of data from the kernel-space address kaddr to the user-space address uaddr.

     copystr()	   Copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address kdaddr.  The
		   number of bytes actually copied, including the terminating NUL, is returned in *done.

RETURN VALUES

     The copy functions return 0 on success or the following error on failure:

     [EFAULT]		If a bad address is encountered. When this error is returned, the contents of the destination buffer ( *kaddr for
			copyin(), copyinstr(), and copystr(); *uaddr for copyout()) are undefined. For copyinstr() and copystr(), the contents of
			the *done parameter are also undefined on a return of EFAULT.

     In addition to EFAULT, copystr() and copyinstr() on failure will return:

     [ENAMETOLONG]	When the string is longer than len bytes. On this error return, the destination buffer is not null-terminated, but the
			*done parameter is maintained.

SEE ALSO

     fetch(9), store(9)

BSD
								  October 2, 2008							       BSD