io_submit - submit asynchronous I/O blocks for processing


#include <libaio.h>

int io_submit(aio_context_t ctx_id, long nr ", struct iocb **" iocbpp );

Link with -laio.


io_submit() queues nr I/O request blocks for processing in the AIO context ctx_id. iocbpp should be an array of nr AIO control blocks, which will be submitted to context ctx_id.


On success, io_submit() returns the number of iocbs submitted (which may be 0 if nr is zero). For the failure return, see NOTES.


EAGAIN Insufficient resources are available to queue any iocbs.
EBADF The file descriptor specified in the first iocb is invalid.
EFAULT One of the data structures points to invalid data.
EINVAL The aio_context specified by ctx_id is invalid. nr is less than 0. The iocb at *iocbpp[0] is not properly initialized, or the operation specified is invalid for the file descriptor in the iocb.
ENOSYS io_submit() is not implemented on this architecture.


The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.


io_submit() 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.

The wrapper provided in libaio for io_submit() does not follow the usual C library conventions for indicating error: 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 indicating an error: -1, with errno set to a (positive) value that indicates the error.


io_cancel(2), io_destroy(2), io_getevents(2), io_setup(2)


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