io_prep_pread(3)                   Linux AIO                  io_prep_pread(3)

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.

SEE ALSO
       io(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).

Linux                             2019-07-23                  io_prep_pread(3)