SND_PCM_SGBUF_OPS_PA(9) Sound Devices SND_PCM_SGBUF_OPS_PA(9)NAME
snd_pcm_sgbuf_ops_page - get the page struct at the given offset
SYNOPSIS
struct page * snd_pcm_sgbuf_ops_page(struct snd_pcm_substream * substream, unsigned long offset);
ARGUMENTS
substream
the pcm substream instance
offset
the buffer offset
DESCRIPTION
Returns the page struct at the given buffer offset. Used as the page callback of PCM ops.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SND_PCM_SGBUF_OPS_PA(9)
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DOFILEREAD(9) BSD Kernel Developer's Manual DOFILEREAD(9)NAME
dofileread, dofilereadv, dofilewrite, dofilewritev -- high-level file operations
SYNOPSIS
#include <sys/file.h>
int
dofileread(struct lwp *l, int fd, struct file *fp, void *buf, size_t nbyte, off_t *offset, int flags, register_t *retval);
int
dofilewrite(struct lwp *l, int fd, struct file *fp, const void *buf, size_t nbyte, off_t *offset, int flags, register_t *retval);
int
dofilereadv(struct lwp *l, int fd, struct file *fp, const struct iovec *iovp, int iovcnt, off_t *offset, int flags, register_t *retval);
int
dofilewritev(struct lwp *l, int fd, struct file *fp, const struct iovec *iovp, int iovcnt, off_t *offset, int flags, register_t *retval);
DESCRIPTION
The functions implement the underlying functionality of the read(2), write(2), readv(2), and writev(2) system calls. They are also used
throughout the kernel as high-level access routines for file I/O.
The dofileread() function attempts to read nbytes of data from the object referenced by file entry fp into the buffer pointed to by buf. The
dofilewrite() function attempts to write nbytes of data to the object referenced by file entry fp from the buffer pointed to by buf.
The dofilereadv() and dofilewritev() functions perform the same operations, but scatter the data with the iovcnt buffers specified by the
members of the iov array.
The offset of the file operations is explicitly specified by *offset. The new file offset after the file operation is returned in *offset.
If the FOF_UPDATE_OFFSET flag is specified in the flags argument, the file offset in the file entry fp is updated to reflect the new file
offset, otherwise it remains unchanged after the operation.
The file descriptor fd is largely unused except for use by the ktrace framework for reporting to userlevel the process's file descriptor.
Upon successful completion the number of bytes which were transferred is returned in *retval.
RETURN VALUES
Upon successful completion zero is returned, otherwise an appropriate error is returned.
CODE REFERENCES
The framework for these file operations is implemented within the file sys/kern/sys_generic.c.
SEE ALSO file(9)BSD December 20, 2005 BSD
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