how to check CAN frame

1. check buffer size

getsockopt(s, SOL_SOCKET, SO_SNDBUF,&snd_size, &optlen);

setsockopt(s, SOL_SOCKET, SO_SNDBUF,&snd_size, &optlen);

setsockopt(s,SOL_SOCKET,SO_RCVBUF, (char *)&rcv_size, optlen);

#include <stdio.h> 
#include <stdlib.h> 
#include <unistd.h> 
#include <string.h> 
#include <errno.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <assert.h> 

int main(int argc,char **argv) 
{ 
int err = -1; /* 傳回值 */ 
int s = -1; /* socket描述符 */ 
int snd_size = 0; /* 發送緩沖區大小 */ 
int rcv_size = 0; /* 接收緩沖區大小 */ 
socklen_t optlen; /* 選項值長度 */ 

/*建立一個TCP套接字 */ 
s = socket(PF_INET,SOCK_STREAM,0); 
if( s == -1){ 
printf("建立套接字錯誤\n"); 
return -1; 
} 

/* 先讀取緩沖區設定的情況,獲得原始發送緩沖區大小*/ 
optlen = sizeof(snd_size); 
err = getsockopt(s, SOL_SOCKET, SO_SNDBUF,&snd_size, &optlen); 
if(err<0){ 
printf("擷取發送緩沖區大小錯誤\n"); 
} 
/*列印原始緩沖區設定情況*/ 

/*獲得原始接收緩沖區大小*/ 
optlen = sizeof(rcv_size); 
err = getsockopt(s, SOL_SOCKET, SO_RCVBUF, &rcv_size, &optlen); 
if(err<0){ 
printf("擷取接收緩沖區大小錯誤\n"); 
} 

printf(" 發送緩沖區原始大小為: %d 位元組\n",snd_size); 
printf(" 接收緩沖區原始大小為: %d 位元組\n",rcv_size); 

/*設定發送緩沖區大小*/ 
snd_size = 10*1024; /* 發送緩沖區大小為8K */ 
optlen = sizeof(snd_size); 
err = setsockopt(s, SOL_SOCKET, SO_SNDBUF, &snd_size, optlen); 
if(err<0){ 
printf("設定發送緩沖區大小錯誤\n"); 
} 

/*設定接收緩沖區大小*/ 
rcv_size = 10*1024; /* 接收緩沖區大小為8K */ 
optlen = sizeof(rcv_size); 
err = setsockopt(s,SOL_SOCKET,SO_RCVBUF, (char *)&rcv_size, optlen); 
if(err<0){ 
printf("設定接收緩沖區大小錯誤\n"); 
} 

/*檢查上述緩沖區設定的情況,獲得修改後發送緩沖區大小 */ 
optlen = sizeof(snd_size); 
err = getsockopt(s, SOL_SOCKET, SO_SNDBUF,&snd_size, &optlen); 
if(err<0){ 
printf("擷取發送緩沖區大小錯誤\n"); 
} 

/*獲得修改後接收緩沖區大小 */ 
optlen = sizeof(rcv_size); 
err = getsockopt(s, SOL_SOCKET, SO_RCVBUF,(char *)&rcv_size, &optlen); 
if(err<0){ 
printf("擷取接收緩沖區大小錯誤\n"); 
} 

/* 列印結果 */ 
printf(" 發送緩沖區大小為: %d 位元組\n",snd_size); 
printf(" 接收緩沖區大小為: %d 位元組\n",rcv_size); 

close(s); 
return 0; 
}      

View Code

2. 檢視統計：

cat /proc/net/can/stats

eg:

nvidia@tegra-ubuntu:~/zrj/laneseg_TRT$ cat /proc/net/can/stats 

   503740 transmitted frames (TXF)
   661826 received frames (RXF)
        0 matched frames (RXMF)

        0 % total match ratio (RXMR)
        0 frames/s total tx rate (TXR)
        0 frames/s total rx rate (RXR)

        0 % current match ratio (CRXMR)
      351 frames/s current tx rate (CTXR)
      351 frames/s current rx rate (CRXR)

        0 % max match ratio (MRXMR)
      408 frames/s max tx rate (MTXR)
     3061 frames/s max rx rate (MRXR)

        0 current receive list entries (CRCV)
        0      

3. ifconfig can1

nvidia@tegra-ubuntu:~/zrj/laneseg_TRT$ ifconfig can1
can1      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          UP RUNNING NOARP  MTU:72  Metric:1
          RX packets:81647 errors:31020 dropped:0 overruns:0 frame:1262
          TX packets:250985 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:10 
          RX bytes:589825 (589.8 KB)  TX bytes:2007880 (2.0 MB)
          Interrupt:172