Thread: EAGAIN undeclared...

Hi there, I guessing that I probably dont have some library so gcc gives this error:
erro: 'EAGAIN' undeclared (first use in this function)

Can you tell what am I doing wrong?

Thanks in advance

Code:

#include <errno.h>

hi again, i am doing a non-blocking server...So I put the

Code:

accept

inside a

Code:

for

and each time

Code:

accept>0

it creates a new thread, passing in it the socket descriptor of accepted client.

I set

Code:

socket(PF_INET, SOCK_STREAM || SOCK_NONBLOCK, IPPROTO_TCP)

.

Can you give me some hints to put the accept in a non-bloking mode? Probably I have to test the accept with the flag EWOULDBLOCK., but I am having some dificulties on setting this up.

Thanks in advance

PS: this is because I want to do more things inside that for...

Well is the first problem solved or not?

I would read this link (especially the bottom), and relevant man pages:
- Blocking vs. non-blocking sockets
- socket(7): socket interface - Linux man page
- fcntl(2): change file descriptor - Linux man page

One thing in particular is that all of these links mention "O_NONBLOCK", and never "SOCK_NONBLOCK".

Originally Posted by nadroj

Well is the first problem solved or not?

I would read this link (especially the bottom), and relevant man pages:
- Blocking vs. non-blocking sockets
- socket(7): socket interface - Linux man page
- fcntl(2): change file descriptor - Linux man page

One thing in particular is that all of these links mention "O_NONBLOCK", and never "SOCK_NONBLOCK".

Thank you. I will read it carefully. SOCK_NONSOCK is a flag mentioned in socket(2) man page

I guess i am having some troubles with error messages. In accept(2) man pages it says that SOCK_NONBLOCK flag will save extra calls to fcntl. So far so good... I set that up and now I simple dont know how to test if accept will block or not.

Any hints??

Cant you just do an "accept" and do a printf statement to see if it continues immediately after the "accept" statement and prints the message, before a client connects? Make sure to print to "stderr", so use "fprintf" to do so (because stderr is unbuffered, so all messages get printed immediately).

I havent done anything with sockets in a while now, so maybe Im just not understanding what the problem is.

Originally Posted by nadroj

Cant you just do an "accept" and do a printf statement to see if it continues immediately after the "accept" statement and prints the message, before a client connects? Make sure to print to "stderr", so use "fprintf" to do so (because stderr is unbuffered, so all messages get printed immediately).

I havent done anything with sockets in a while now, so maybe Im just not understanding what the problem is.

Thanks for the answer. Dont know that about fprintf ! Yep, its that I am trying to do. So I guess I am doing it wrong because accept will block my other threads that are running simultaneous. As I say I maybe have to use fcntl...

Thank you again.

Originally Posted by MK27

Okay. This is very very non-standard tho, since I am running glibc 2.9 (fedora 10-64) and accept4 does not exist here, so it probably will not be available on 95%+ of linux systems.[/code]

Thanks you for the hints. Thats what I am going to do...I will post my results later

Problem solved...Its runnig all ok. Thanks for your help