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Full Discussion: writing binary/struct data to file
Top Forums Programming writing binary/struct data to file Post 302318825 by jim mcnamara on Friday 22nd of May 2009 10:40:32 AM
Old 05-22-2009
You are not writing tinner to the file - just a pointer which means nothing when you try to read the file try:
Code:
#include <stdlib.h>
#include <stdio.h>

struct tinner {
  int j;
  int k[3];
};

struct touter {
  int i;
  struct tinner inner;
};

int main() {
        struct touter data;
        data.i = 10;

       
        data.inner.j = 5;
        data.inner.k[0] = 1, data.inner.k[1] = 2, data.inner.k[2] = 3;
        

        printf("sizeof(data)=%d\n", sizeof(data) );

        FILE *fp = fopen("test.dat", "w+b");
        fwrite((const void *) &data, sizeof(data), 1, fp);
        fflush(fp);
        fclose(fp);
        return 0;
}

 

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LEARN ABOUT PLAN9

kldsym

KLDSYM(2)						      BSD System Calls Manual							 KLDSYM(2)

NAME

     kldsym -- look up address by symbol name in a KLD

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/param.h>
     #include <sys/linker.h>

     int
     kldsym(int fileid, int command, void *data);

DESCRIPTION

     The kldsym() system call returns the address of the symbol specified in data in the module specified by fileid.  If fileid is 0, all loaded
     modules are searched.  Currently, the only command implemented is KLDSYM_LOOKUP.

     The data argument is of the following structure:

	   struct kld_sym_lookup {
	       int	   version;	   /* sizeof(struct kld_sym_lookup) */
	       char	   *symname;	   /* Symbol name we are looking up */
	       u_long	   symvalue;
	       size_t	   symsize;
	   };

     The version member is to be set by the code calling kldsym() to sizeof(struct kld_sym_lookup).  The next two members, version and symname,
     are specified by the user.  The last two, symvalue and symsize, are filled in by kldsym() and contain the address associated with symname and
     the size of the data it points to, respectively.

RETURN VALUES

     The kldsym() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS

     The kldsym() system call will fail if:

     [EINVAL]		Invalid value in data->version or command.

     [ENOENT]		The fileid argument is invalid, or the specified symbol could not be found.

SEE ALSO

     kldfind(2), kldfirstmod(2), kldload(2), kldnext(2), kldunload(2), modfind(2), modnext(2), modstat(2), kld(4)

HISTORY

     The kldsym() system call first appeared in FreeBSD 3.0.

BSD
								   July 26, 2001							       BSD
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