Thread: error: syntax error before 'struct'

I am a little perplexed here . Not able to make out what could be causing this error :

Code:

     1 #include <stdio.h>
      2 #include <errno.h>
      3 #include <linx.h>
      4 #include <linx_socket.h>
      5 #include <linx_ioctl.h>
      6 #include "linx_basic.sig"
      7 #include "linx_basic.h"
      8
      9 /*
     10  *    LINX example client
     11  */
     12
     13 int main()
     14 {
     15   int listen_sd, tran_sd,temp;
     16   struct sockaddr_linx server_addr;
     17   struct sockaddr_linx client_addr;
     18   char buf[10];
     19
     20   client_addr.family=AF_LINX;
     21
     22   listen_sd = socket(PF_LINX, SOCK_DGRAM ,0);
     23   printf(" listen_sd = %d\n",listen_sd);
     24     temp=ioctl(listen_sd,LINX_IOCTL_HUNT,DX1/linx_basic_client);
     25   printf("temp =%d\n",temp);
     26
     27   tran_sd=ioctl(listen_sd,LINX_IOCTL_HUNT,DX2/linx_basic_server);
     28   printf("tran_sd = %d\n",tran_sd);
     29
     30   server_addr.spid=tran_sd;
     31   temp=recvfrom(tran_sd,buf,10,0,(struct sockaddr*)&server_addr,sizeof(server_addr));
     32   printf("bytes received = %d\n",temp);
     33   printf(" %s \n",buf);
     34
     35   close(tran_sd);
     36   close(listen_sd);
     37   return 0;
     38 }

And these are the error messages that I got :

Code:

Building linx_basic
linx_basic_client.c: In function 'main':
linx_basic_client.c:24: warning: implicit declaration of function 'ioctl'
linx_basic_client.c:24: warning: implicit declaration of function '_IOWR'
linx_basic_client.c:24: error: syntax error before 'struct'
linx_basic_client.c:27: error: syntax error before 'struct'
linx_basic_client.c:31: warning: passing argument 6 of 'recvfrom' makes pointer from integer without a cast
linx_basic_client.c:35: warning: implicit declaration of function 'close'
make: *** [linx_basic] Error 1

I think I have included the "linx_socket.h" and the "linx_ioctl.h" files correctly. I got a lot of errors before i included them in. Though, the first two warnings indicate that something could be wrong there too.
Also, The errors are pointing to line 24 and 27 , but the struct declaration statements are in lines 16 and 17.
Should I post any other relevant info?

I would guess you need to
#include <unistd.h>
as well, to get ioctl() prototyped and _IOWR defined.

Did that, The last warning got knocked off... But the rest still remain :

Code:

Building linx_basic
linx_basic_client.c: In function 'main':
linx_basic_client.c:25: warning: implicit declaration of function 'ioctl'
linx_basic_client.c:25: warning: implicit declaration of function '_IOWR'
linx_basic_client.c:25: error: syntax error before 'struct'
linx_basic_client.c:28: error: syntax error before 'struct'
linx_basic_client.c:32: warning: passing argument 6 of 'recvfrom' makes pointer from integer without a cast
make: *** [linx_basic] Error 1

Hmpf, ioctl() would seem to be in ioctl.h, not unistd.h

> DX1/linx_basic_client
I've no idea what that looks like - but having a division seems odd to me.

Try
gcc -E prog.c > prog.i
to see what the code really looks like after the pre-processor has done it's work, to see if the result actually makes any kind of sense.

The last error you're getting is because you need to pass a pointer to a socklen_t variable that holds the size of the struct. You can't pass the size directly.

My mistake.. I had not read the doc for the ioctl correctly. The problem was with the argument.

What makes ioctl generate an error of this kind :

Code:

ioctl: Cannot allocate memory

and this is what dmesg gives :

Code:

LINX: ERROR - Could not allocate kernel memory to hold the hunt name.