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.

Debian                                          October 17, 2016                                       KLDSYM(2)