Dennis Windisch wrote: >> 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
No, that's something completely different. See "man netdevice" for an explanation of SIOCGIFFLAGS. > 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? You are passing NULL as argument, this makes the RTnet core unhappy (we do not check user arguments yet). > > 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 > Jan
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