man kldsym (2): look up address by symbol name in a KLD

LIBRARY

Lb libc

SYNOPSIS

In sys/param.h In sys/linker.h Ft int Fn kldsym int fileid int command void *data

DESCRIPTION

The Fn kldsym system call returns the address of the symbol specified in Fa data in the module specified by Fa fileid . If Fa fileid is 0, all loaded modules are searched. Currently, the only Fa command implemented is KLDSYM_LOOKUP

The Fa 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 Fn kldsym to Fn 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 Fn kldsym and contain the address associated with symname and the size of the data it points to, respectively.

RETURN VALUES

Rv -std kldsym

ERRORS

The Fn kldsym system call will fail if:

Bq Er EINVAL: Invalid value in Fa data->version or Fa command .
Bq Er ENOENT: The Fa fileid argument is invalid, or the specified symbol could not be found.

HISTORY

The Fn kldsym system call first appeared in Fx 3.0 .