Re: [Chicken-users] declare-foreign-record and typedefs

[Kon Lovett]

On Nov 29, 2007, at 7:24 AM, Ozzi wrote:

> I would like to declare a foreign record for the following struct:
>
>      struct statfs {
>          short   f_otype;    /* type of file system (reserved:  
> zero) */
>          short   f_oflags;   /* copy of mount flags (reserved:  
> zero) */
>          long    f_bsize;    /* fundamental file system block size */
>          long    f_iosize;   /* optimal transfer block size */
>          long    f_blocks;   /* total data blocks in file system */
>          long    f_bfree;    /* free blocks in fs */
>          long    f_bavail;   /* free blocks avail to non-superuser */
>          long    f_files;    /* total file nodes in file system */
>          long    f_ffree;    /* free file nodes in fs */
>          fsid_t  f_fsid;     /* file system id (super-user only) */
>          uid_t   f_owner;    /* user that mounted the file system */
>          short   f_reserved1;        /* reserved for future use */
>          short   f_type;     /* type of file system (reserved) */
>          long    f_flags;    /* copy of mount flags (reserved) */
>          long    f_reserved2[2];     /* reserved for future use */
>          char    f_fstypename[MFSNAMELEN]; /* fs type name */
>          char    f_mntonname[MNAMELEN];    /* directory on which  
> mounted */
>          char    f_mntfromname[MNAMELEN];  /* mounted file system */
>          char    f_reserved3;        /* reserved for future use */
>          long    f_reserved4[4];     /* reserved for future use */
>      };
>
> Is there a way to deal with fsid_t and uid_t, other than looking  
> into the header file and using whatever they're declared as instead?

Yes, & definitely no. Unless the primitive C representation is known  
Chicken cannot convert parameter & return values. See 'define-foreign- 
type' in the "Accessing external objects" of the manual. This  
provides sugar but no magic.

Ex: (define-foreign-type nonnull-pcre (nonnull-c-pointer "pcre"))

SWIG might help but I haven't used it. Never had to adapt something  
so large I couldn't write my own interface.

> Thanks,
>
> Ozzi
>
>
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Best Wishes,
Kon