io_prep_pread - Online Linux Manual PageSection : 3
Updated : 2019-07-23
Source : Linux
Note : Linux AIO

NAMEio_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; };

DESCRIPTIONio_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 VALUESNone.

ERRORSNone.

SEE ALSOio(3), io_cancel(3), io_fsync(3), io_getevents(3), io_prep_fsync(3), io_prep_pwrite(3), io_queue_init(3), io_queue_release(3), io_queue_run(3), io_queue_wait(3), io_set_callback(3), io_submit(3), errno(3).
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