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

From: Kon Lovett
Subject: Re: [Chicken-users] declare-foreign-record and typedefs
Date: Fri, 30 Nov 2007 09:23:47 -0800

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.



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