XrdOucPgrwUtils.hh File Reference

#include <cstdint>
#include <vector>
#include <sys/types.h>

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Classes
struct	XrdOucPgrwUtils::dataInfo
struct	XrdOucPgrwUtils::Layout
	Compute the layout for an iovec that receives network bytes applying. More...
class	XrdOucPgrwUtils

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Class Documentation

XrdOucPgrwUtils::Layout

struct XrdOucPgrwUtils::Layout

Compute the layout for an iovec that receives network bytes applying.

Parameters

layout	Reference to the layout parameter (see below).
offs	recvLayout: Offset at which the subsequent write occurs. sendLayout: Offset at which the preceding read occurs.
dlen	recvLayout: Nmber of sock bytes to receive with checksums.
dlen	sendLayout: Nmber of file bytes to read without checksums.
bsz	The size of the buffer exclusive of any checksums and must be a multiple of 4096 (one page). If it's <= 0 then then the layout is computed as if bsz could fully accomodate the dlen.

Returns

The number of checksums that are needed. If the result is zero then the supplied offset/dlen violates requirements amd eWhy holds reason.

Note

The iovec layout assumes iov[0] reads the checksum and iov[1] reads only the data where the last such pair is iov[csnum*-2],iov[csnum*-1].

dataLen can be used to adjust the next offset for filesystem I/O while sockLen is the total number of network bytes to receive or send.

Definition at line 134 of file XrdOucPgrwUtils.hh.

Collaboration diagram for XrdOucPgrwUtils::Layout:

Class Members
off_t	bOffset	Buffer offset to apply iov[1].iov_base.
int	dataLen	Total number of filesys bytes the iovec will handle.
const char *	eWhy	Reason for failure when zero is returned.
int	fLen	Length to use for iov[1].iov_len.
int	lLen	Length to use for iov[csnum*2-1].iov_len)
int	sockLen	Total number of network bytes the iovec will handle.