kldsym man page on FreeBSD

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

     kldsym — look up address by symbol name in a KLD

     Standard C Library (libc, -lc)

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

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

     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 mod‐
     ules are searched.	 Currently, the only command implemented is

     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.

     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

     The kldsym() system call will fail if:

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

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

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

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

BSD				 July 26, 2001				   BSD

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