error: syntax error before 'struct'

This is a discussion on error: syntax error before 'struct' within the C Programming forums, part of the General Programming Boards category; I am a little perplexed here . Not able to make out what could be causing this error : Code: ...

  1. #1
    Eager young mind
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    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?
    In the middle of difficulty, lies opportunity

  2. #2
    and the hat of wrongness Salem's Avatar
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    I would guess you need to
    #include <unistd.h>
    as well, to get ioctl() prototyped and _IOWR defined.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    Eager young mind
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    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
    In the middle of difficulty, lies opportunity

  4. #4
    and the hat of wrongness Salem's Avatar
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    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.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  5. #5
    Gawking at stupidity
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    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.
    If you understand what you're doing, you're not learning anything.

  6. #6
    Eager young mind
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    My mistake.. I had not read the doc for the ioctl correctly. The problem was with the argument.
    In the middle of difficulty, lies opportunity

  7. #7
    Eager young mind
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    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.
    In the middle of difficulty, lies opportunity

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