jammy (2) kldsym.2freebsd.gz

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.