How to link async -io capability into a C program - for the sake of doing
async file/device i/o in user mode.

uname -r returns 4.11.3LnxKrnl (NO modifications to general at src-level - just adding two drivers)
lsb_release -a returns Dist..ID: Ubuntu; Desc...: Ubuntu 16.04.2 LTS; Release: 16.04
I am working w/ Eclipse 3.8.1

The following code compiles:
#include <aio.h>
:::
rc = aio_write(&aio_cb);
rc = aio_read(&aio_cb);
rc = aio_error(&aio_cb);
rc = aio_return(&aio_cb);

I do not need event-posting or a completion routine.
I can wait for the results. I am exercising a new driver.

The linker fails to find the above entry points (undefined reference(s) to 'aio_xxx').

When i add -o aio.o these four entry points are found but there is over 100 newer link errors.
Many seem to be kernel/synchronization related (mutex, spin_lock_save_irql, kmap etc.)

It is preferable to link in libaio - i think.
I have executed sudo apt-get install libaio-dev.
Repeating i get libaio-dev is already ..... (0.3.110-2)
libaio.a is found in /usr/lib/i386-linux-gnu/libaio.a
In Eclipse i have Linker Flags: -l libaio.a ; Library search path /usr/lib/i386-linux-gnu

The same four entry point errors in the link persist.
What might i be missing?
Thanks in advance

You're missing a LOT of details that would let us even guess an answer to your question. Version/distro of Linux? What code you have now? What got you to asking about aio in the first place, etc. Read the "Question Guidelines" link in my posting signature.

Putting "how to use aio library in Linux" into Google yields a good bit:
http://man7.org/linux/man-pages/man7/aio.7.html
https://www.ibm.com/developerworks/l...ync/index.html
https://github.com/littledan/linux-aio

1 members found this post helpful.

Do not edit your posts; your first post was quoted in its entirety, in my reply (post #2). Doing such things makes it much harder for anyone to read/follow the thread.

Are you sure the aio.h file is in a path where your compiler can find it? Did you try to specify a path to the file?

Looks like you need to check out your source code.

I have solved the problem.
First let me be clear that i was able to compile the source code above w/ aio_xyz functions.
I was not able to link-edit.
It turns out that Eclipse was not honoring my linker flag(s).
It was necessary to run from the command line.
It was also necessary to set -laio last on the command line for the cc... command,
as was suggested by someone on Stackoverflow or somewhere similar.

A friend is suggesting SlickEdit as an IDE instead of Eclipse. ($$$)
I am relatively happy w/ Link+ for driver dev which runs on top of Eclipse.
Thanks and onward ...