Sorry for the previous unexpected line wrap... this time hopefully this will
work...
please note that I am trying to communicate periodically with an application
running standard winsock UDP/IP socket on windows machine....Please rectify
if I have made any fundamental error...
The source code...
static struct sockaddr_in local_addr;
static struct sockaddr_in server_addr;
static void *SendRcvFun(void *arg)
{
RT_TASK *handler; //local handler
static struct {
unsigned long indx;
RTIME time;
} msg = {0,0};
int sockfd = 0;
int ret = 0;
char msgStr[100] = "Hello world";
/* Set variables to zero. */
memset(msgStr, 0, sizeof(msgStr));
memset(&local_addr, 0, sizeof (struct sockaddr_in));
memset(&server_addr, 0, sizeof(struct sockaddr_in));
printf("RTnet, simpleserver for LXRT\n");
/* Check arguments and set addresses. */
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = INADDR_ANY;
local_addr.sin_port = htons(11000);//htons(atoi(11000));
server_addr.sin_family = AF_INET;
inet_aton("139.30.6.66", &server_addr.sin_addr);
server_addr.sin_port = htons(11000);
printf("SendRcv Start\n");
rtf_create(FIFO, 2000);
printf("FIFO created\n");
mlockall(MCL_CURRENT | MCL_FUTURE);
sockfd = rt_dev_socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sockfd < 0) {
printf("Error opening socket: %d\n", sockfd);
exit(1);
}
//
if (!(handler= rt_task_init_schmod(nam2num("SRTSK"), 0, 0,
0,SCHED_FIFO,
0xFF))) {
printf("CANNOT INIT SendRcvFun\n");
rt_dev_close(sockfd);
exit(1);
}
rt_set_periodic_mode();
start_rt_timer(0);
period = start_rt_timer(nano2count(TIMERTICKS));
rt_task_make_periodic(handler, rt_get_time()+period, period);
rt_make_hard_real_time();
/* Bind socket to local address specified as parameter. */
ret = rt_dev_bind(sockfd, (struct sockaddr *) &local_addr,
sizeof(struct
sockaddr_in));
/* Specify destination address for socket; needed for rt_socket_send().
*/
rt_dev_connect(sockfd, (struct sockaddr *) &server_addr, sizeof(struct
sockaddr_in));
endSendRcvFun = 0;
while (!endSendRcvFun) {
ret = rt_dev_recv(sockfd, msgStr, sizeof(msgStr), MSG_DONTWAIT);
ret = rt_dev_send(sockfd, msgStr, sizeof(msgStr), MSG_DONTWAIT);
msg.indx = ret;
msg.time = rt_get_time_ns();
rtf_put(FIFO, &msg, sizeof(msg));
//printk("h");
rt_task_wait_period();
}
stop_rt_timer();
rt_make_soft_real_time();
rt_dev_close(sockfd);
rt_task_delete(handler);
rtf_destroy(FIFO);
return 0;
}
I suspect the error occurs when I insert the code
ret = rt_dev_recv(sockfd, msgStr, sizeof(msgStr), MSG_DONTWAIT);
The error reported by the dmesg...
*** RTnet 0.9.8 - built on Jan 12 2007 20:25:45 ***
RTnet: initialising real-time networking
initializing loopback...
RTnet: registered rtlo
ACPI: PCI Interrupt 0000:02:08.0[A] -> Link [LNKD] -> GSI 9 (level, low) ->
IRQ 9
rteth0: OEM i82557/i82558 10/100 Ethernet, 00:30:05:08:51:74, IRQ 9.
RTnet: registered rteth0
RTnet: host 222.83.167.242 unreachable
RTnet: no protocol found
RTnet: no protocol found
RTnet: no protocol found
RTnet: no protocol found
LXRT CHANGED MODE (TRAP), PID = 4313, VEC = 14, SIGNO = 11.
BUG: unable to handle kernel NULL pointer dereference at virtual address
00000024
printing eip:
d0f666be
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: rt_eepro100 rt_loopback rtipv4 rtnet rtai_rtdm rtai_fifos
rtai_sem rtai_lxrt rtai_hal button battery ac loop dm_mod bttv video_buf
firmware_class ir_common compat_ioctl32 i2c_algo_bit v4l2_common btcx_risc
tveeprom videodev mii intel_agp agpgart ide_cd uhci_hcd cdrom usbcore
i8xx_tco i2c_i801 shpchp i2c_core pci_hotplug parport_pc lp parport ext3
mbcache jbd edd fan sg aic7xxx scsi_transport_spi piix thermal processor
sd_mod scsi_mod ide_disk ide_core
CPU: 0
EIP: 0060:[<d0f666be>] Not tainted VLI
EFLAGS: 00013246 (2.6.17-RTAI #1)
EIP is at rt_udp_recvmsg+0xd6/0x1b8 [rtipv4]
eax: 00000000 ebx: cf82e5f4 ecx: 00003246 edx: 00000000
esi: 00000000 edi: ca401ee8 ebp: c60c4a90 esp: ca401e84
ds: 007b es: 007b ss: 0068
Process udpsendReceive (pid: 4313, threadinfo=ca400000 task=c60c4a90)
Stack: cf82e618 ffffffff ffffffff 00000000 cf82e618 00000064 cf82e604
cf82e5e0
00000040 ca401ee8 c60c4a90 d0f6d666 cf82e5e0 c60c4a90 ca401ee8
00000040
fffffff2 ca401ee8 b7e1d2e0 c60c4a90 d0f6e940 c60c4a90 00000000
ca401ee8
Call Trace:
<d0f6d666> _rtdm_recvmsg+0x4e/0x70 [rtai_rtdm] <d0f6e940>
sys_rtdm_recvmsg+0x5e/0x82 [rtai_rtdm]
<d0f8083f> rtai_lxrt_invoke+0x151/0x10c6 [rtai_lxrt] <d0f83be3>
rt_task_make_periodic+0x0/0xed [rtai_lxrt]
<d0f6e8e2> sys_rtdm_recvmsg+0x0/0x82 [rtai_rtdm] <c01176b1>
sched_setscheduler+0x22c/0x269
<c0142e8d> __ipipe_dispatch_event+0x32/0x10d <d0f58053>
rtai_syscall_dispatcher+0x55/0xeb [rtai_hal]
<d0f5707e> rtai_uvec_handler+0x1a/0x30 [rtai_hal]
Code: 00 8b 7c 24 14 e9 a9 00 00 00 8d 73 10 89 74 24 18 9c 59 fa 8b 73 10
85 f6 74 0e 8b 56 04 8b 02 89 43 10 c7 02 00 00 00 00 51 9d <8b> 4e 24 0f b7
51 04 0f b6 c2 c1 e0 08 c1 ea 08 09 d0 8d 68 f8
EIP: [<d0f666be>] rt_udp_recvmsg+0xd6/0x1b8 [rtipv4] SS:ESP 0068:ca401e84
LXRT releases PID 4313 (ID: udpsendReceive).
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