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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.