help about compilation error

This is a discussion on help about compilation error within the Linux Programming forums, part of the Platform Specific Boards category; i want to perform posix shared memory ipc here is the reader program / Code: //////////////////////////////////////////////////// #include <sys/mman.h> #include <sys/types.h> ...

  1. #1
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    help about compilation error

    i want to perform posix shared memory ipc
    here is the reader program
    /

    Code:
    //////////////////////////////////////////////////// #include <sys/mman.h> #include <sys/types.h> #include <stdio.h> #include <unistd.h> int main(int argc,char** argv) {  int i,fd;  struct stat st;  unsigned char c,*ptr;    if(argc!=2)  {   fprintf(stdout,"usage: shm_read <name>");   }  fd=shm_open(argv[1],0,0777);    fstat(fd,&st);    ptr=mmap(NULL,4096,PROT_READ,MAP_SHARED,fd,0);    close(fd);    for(i=0;i<st.st_size;i++)  {   fprintf(stdout,"%d",*ptr++);  }  exit(0); } ///////////////////////////////////////////////////code ends
    when i compile it i get the error
    shm_read.c: In function `main':
    shm_read.c:8: storage size of `st' isn't known(soory for the code misformatting)
    help plz
    Last edited by netwizio; 01-16-2004 at 03:03 PM.
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  2. #2
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    Well there's nothing like posting crap formatting to turn people off helping you
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  3. #3
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    Re: help about compilation error

    Code:
    #include <sys/mman.h> 
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <stdio.h> 
    #include <unistd.h> i
    nt main(int argc,char** argv) 
    {  
       int i,fd;  
       struct stat st;  
       unsigned char c,*ptr;    
       if(argc!=2)
       {
            fprintf(stdout,"usage: shm_read <name>\n");
            return -1; 
       }
       fd=shm_open(argv[1],0,0777);
       fstat(fd,&st);
       ptr=mmap(NULL,4096,PROT_READ,MAP_SHARED,fd,0);
       close(fd);
       for(i=0;i<st.st_size;i++)
       {
            fprintf(stdout,"%d",*ptr++);
       }
       return 0;
    }

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