Manpage of IO_SUBMIT
IO_SUBMITSection: Linux Programmer's Manual (2)
NAMEio_submit - submit asynchronous I/O blocks for processing
#include <linux/aio_abi.h> /* Defines needed types */ int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);
The io_submit() system call queues nr I/O request blocks for processing in the AIO context ctx_id. The iocbppargument should be an array of nr AIO control blocks, which will be submitted to context ctx_id.
RETURN VALUEOn success, io_submit() returns the number of iocbs submitted (which may be 0 if nr is zero). For the failure return, see NOTES.
- Insufficient resources are available to queue any iocbs.
- The file descriptor specified in the first iocb is invalid.
- One of the data structures points to invalid data.
- The AIO context specified by ctx_id is invalid. nr is less than 0. The iocb at *iocbppis not properly initialized, or the operation specified is invalid for the file descriptor in the iocb.
- io_submit() is not implemented on this architecture.
NOTESGlibc 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_submit() wrapper function provided by libaio.
Note that the libaiowrapper function uses a different type (io_context_t) for the ctx_idargument. Note also that the libaiowrapper does not follow the usual C library conventions 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 indicating an error: -1, with errnoset to a (positive) value that indicates the error.
SEE ALSOio_cancel(2), io_destroy(2), io_getevents(2), io_setup(2), aio(7)
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