>First I want to get the current flags of the socket:
>> int tmp = fcntl(m_socket, F_GETFL, 0);
>Then I want to add the "non-blocking" mode
>> int res = fcntl(m_socket, F_SETFL,tmp | O_NONBLOCK);
It's always the same... shortly after writing to the mailing list, I found
the solution to my problem myself...
>int tmp = ioctl_rt(m_socket, SIOCGIFFLAGS, 0);
is the IOCTL to get the flags... but now I'm having an even bigger
problem... executing this IOCTL (and also other I tried) fail with a
segmentation fault.
Has anyone an idea which is the cause of this segmenation fault?
Below is the dmesg print-out:
-----------------------------
Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
f8afe0eb
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: rtcap rt_8139too rt_loopback rtpacket rtipv4 rtnet
rtai_rtdm rtai_sem rtai_lxrt rtai_hal nvidia
CPU: 0
EIP: 0060:[<f8afe0eb>] Tainted: P VLI
EFLAGS: 00210016 (2.6.15.1)
EIP is at rtdev_get_by_name+0x36/0x69 [rtnet]
eax: 00000072 ebx: 00000010 ecx: 0000000f edx: 00000000
esi: f3f86605 edi: 00000000 ebp: f3f86600 esp: f7b59ec0
ds: 007b es: 007b ss: 0068
Process krcrtreceiverte (pid: 6818, threadinfo=f7b58000 task=f2f99530)
Stack: 00000000 00200286 f2fbc100 00000000 00008913 f2f99530 f8b00218
00000000
00000000 00000000 f2fbc100 00000000 00008913 f2f99530 f8aea569
f2fbc100
f2f99530 00008913 00000000 00000004 f8aee260 00000000 bfb49460
f8aeb401
Call Trace:
[<f8b00218>] rt_socket_if_ioctl+0xe9/0x10d [rtnet]
[<f8aea569>] _rtdm_ioctl+0x5a/0x85 [rtai_rtdm]
[<f8aeb401>] sys_rtdm_ioctl+0x2c/0x30 [rtai_rtdm]
[<f8b14b5b>] rtai_lxrt_invoke+0xdc9/0xfe2 [rtai_lxrt]
[<c016489c>] vfs_write+0x122/0x1aa
[<f8af114d>] rtai_syscall_dispatcher+0x93/0x11e [rtai_hal]
[<f8af11f2>] rtai_uvec_handler+0x1a/0x2f [rtai_hal]
Code: 9c 8f 44 24 04 fa bb 10 00 00 00 c7 04 24 00 00 00 00 8b 04 24 8b 2c
85 00 45 b0 f8 85 ed 74 1e 8d 75 04 89 d7 89 d9 49 78 08 ac <ae> 75 08 84 c0
75 f5 31 c0 eb 04 19 c0 0c 01 85 c0 74 19 83 04
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