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 cmd, 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
     cmd 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 cmd.

     [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.