errno pb - High Level Programming

dts · #1 08-06-2004

Hello,

I need to make a lib with pthread, when I run my make file all is good. But when I run my test program, I test errno in the begining and is already set to 251. Is it normal ??? What can I modify in my Makefile to have errno set to 0 ???

Thanks

$make
gcc -D_REENTRANT -shared -fpic -lpthread gas_configuration.c gas_acquisition.c -o libgas_fifos.sl
gcc -L. -lgas_fifos testComm.c -o test
$./test
Begin
errno : 251
$

dts · #2 08-06-2004

I need to test errno to know if my recvfrom return EAGAIN.

my code :

Code:

retour = recvfrom(t_sockets[indice].socket, payload, FRAME_LENGTH, O_NONBLOCK, &t_sockets[indice].sin_remote, &size_addr);
if(retour >= 0)
{
.......
}
else
{
     printf("errno %d\n", errno);
     if(errno != EAGAIN)
     {
          perror("Error in recvfrom");
     }
}

Quote:

251
Error in recvfrom: Resource temporarily unavailable

How can I correct the problem ??

Thanks for your help.

dts · #3 08-06-2004

Quote:

Originally posted by Driver

Are you absolutely sure the code you posted matches the code you are using? Because the error message indicates that errno compares uneven to EAGAIN even though it IS EAGAIN.

What does printf("%d\n", EAGAIN); tell you?

11

Quote:

What happens if you omit the printf() and have the if-test execute immediately afterwards?

Error in recvfrom: Resource temporarily unavailable

dts · #4 08-06-2004

I have resolved my problem. I use Multi-threaded and I have gorget the option with gcc :
-D_REENTRANT

Thankes for your help

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