what are the ways to create a file descriptor?

Asked May 28 '13 at 12:26

Active May 28 '13 at 12:34

Viewed 881 times

The Wikipedia page for File Descriptor lists the following system calls:

 - open(), open64()
 - creat(), creat64()
 - socket()
 - accept()
 - socketpair()
 - epoll_create() (Linux only)
 - pipe()
 - signalfd() (Linux only)
 - eventfd() (Linux only)

Are there any other methods on other platforms, especially on QNX?

I have a thread which is monitoring a bunch of sockets with a poll() call and receiving "Commands" from the sockets. Now I need to add the possibility to send such "Commands" from other threads running in the same process. I would like to avoid the overhead of writing into a pipe/socket within the same process if possible.

Can anyone think of somehow monitoring a conditional variable using poll() for example?

edited May 28 '13 at 12:34

BoBTFish

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asked May 28 '13 at 12:26

Ashimjyoti

Does the "command" _have_ to be sent through a file descriptor? Why not simply have a message queue, and when the `poll` call time out you check this queue? And if you will "send" these commands in the same process as you do the receiving, why bother sending at all? – Some programmer dude May 28 '13 at 12:30
Linux has also `timerfd_create` to create a file descriptor.... – Basile Starynkevitch May 28 '13 at 12:35
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And I believe a pipe to self is really quick. – Basile Starynkevitch May 28 '13 at 12:36

what are the ways to create a file descriptor?

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