IO_GETEVENTS(2)           (2020-12-21)            IO_GETEVENTS(2)

          io_getevents - read asynchronous I/O events from the
          completion queue

          #include <linux/aio_abi.h>         /* Defines needed types */
          #include <linux/time.h>            /* Defines 'struct timespec' */

          int io_getevents(aio_context_t ctx_id, long min_nr, long nr
                           struct io_event *events, struct timespec *timeout);

          Note: There is no glibc wrapper for this system call; see

          Note: this page describes the raw Linux system call inter-
          face.  The wrapper function provided by libaio uses a dif-
          ferent type for the ctx_id argument.  See NOTES.

          The io_getevents() system call attempts to read at least
          min_nr events and up to nr events from the completion queue
          of the AIO context specified by ctx_id.

          The timeout argument specifies the amount of time to wait
          for events, and is specified as a relative timeout in a
          structure of the following form:

              struct timespec {
                  time_t tv_sec;      /* seconds */
                  long   tv_nsec;     /* nanoseconds [0 .. 999999999] */

          The specified time will be rounded up to the system clock
          granularity and is guaranteed not to expire early.

          Specifying timeout as NULL means block indefinitely until at
          least min_nr events have been obtained.

          On success, io_getevents() returns the number of events
          read.  This may be 0, or a value less than min_nr, if the
          timeout expired.  It may also be a nonzero value less than
          min_nr, if the call was interrupted by a signal handler.

          For the failure return, see NOTES.

               Either events or timeout is an invalid pointer.

     Page 1                        Linux             (printed 5/24/22)

     IO_GETEVENTS(2)           (2020-12-21)            IO_GETEVENTS(2)

               Interrupted by a signal handler; see signal(7).

               ctx_id is invalid.  min_nr is out of range or nr is out
               of range.

               io_getevents() is not implemented on this architecture.

          The asynchronous I/O system calls first appeared in Linux

          io_getevents() is Linux-specific and should not be used in
          programs that are intended to be portable.

          Glibc does not provide a wrapper function for this system
          call.  You could invoke it using syscall(2).  But instead,
          you probably want to use the io_getevents() wrapper function
          provided by libaio.

          Note that the libaio wrapper function uses a different type
          (io_context_t) for the ctx_id argument.  Note also that the
          libaio wrapper does not follow the usual C library conven-
          tions for indicating errors: on error it returns a negated
          error number (the negative of one of the values listed in
          ERRORS).  If the system call is invoked via syscall(2), then
          the return value follows the usual conventions for indicat-
          ing an error: -1, with errno set to a (positive) value that
          indicates the error.

          An invalid ctx_id may cause a segmentation fault instead of
          generating the error EINVAL.

          io_cancel(2), io_destroy(2), io_setup(2), io_submit(2),
          aio(7), time(7)

          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about
          reporting bugs, and the latest version of this page, can be
          found at

     Page 2                        Linux             (printed 5/24/22)