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io_prep_pread(3)

Linux
2019-07-23

libaio-dev

Linux kernel AIO access library - development files

NAME

io_prep_pread - Set up asynchronous read

SYNOPSIS

#include <errno.h>

#include <libaio.h>
inline void io_prep_pread(struct iocb *iocb, int fd, void *buf, size_t count, long long offset);
struct iocb { void *data; unsigned key; short aio_lio_opcode; short aio_reqprio; int aio_fildes; };

DESCRIPTION

io_prep_pread() is an inline convenience function designed to facilitate the initialization of the iocb for an asynchronous read operation.
The first iocb->u.c.nbytes = count bytes of the file for which iocb->aio_fildes = fd is a descriptor are written to the buffer starting at iocb->u.c.buf = buf. Reading starts at the absolute position ioc->u.c.offset = offset in the file.
This function returns immediately. To schedule the operation, the function io_submit(3) must be called.
Simultaneous asynchronous operations using the same iocb produce undefined results.

RETURN VALUES

None.

ERRORS

None.
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