.\"	$NetBSD: dlfcn.3,v 1.30 2010/12/24 13:00:24 wiz Exp $
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.\" Copyright (c) 1998 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Paul Kranenburg.
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.Dd April 28, 2011
.Dt DLFCN 3
.Os
.Sh NAME
.Nm dlopen ,
.Nm dlclose ,
.Nm dlinfo ,
.Nm dladdr ,
.Nm dlsym ,
.Nm dlfunc ,
.Nm dlvsym ,
.Nm dl_iterate_phdr ,
.Nm dlerror
.Nd programmatic interface to the dynamic linker
.Sh LIBRARY
This function is not in a library.
It is included in every dynamically linked program automatically.
.Sh SYNOPSIS
.In dlfcn.h
.Ft "void *"
.Fn dlopen "const char *name" "int mode"
.Ft int
.Fn dlclose "void *handle"
.Ft int
.Fn dlinfo "void *handle" "int request" "void *p"
.Ft int
.Fn dladdr "const void *addr" "Dl_info *info"
.Ft "void *"
.Fn dlsym "void *handle" "const char *name"
.Ft dlfunc_t
.Fn dlfunc "void *handle" "const char *name"
.Ft "void *"
.Fn dlvsym "void *handle" "const char *name" "const char *version"
.Ft "char *"
.Fn dlerror "void"
.In link.h
.Ft "int"
.Fn dl_iterate_phdr "int (*callback)(struct dl_phdr_info *, size_t, void *)" "void * data"
.Sh DESCRIPTION
These functions provide an interface to the run-time linker
.Xr ld-elf.so.2 1 .
They allow new shared objects to be loaded into the process' address space
under program control.
.Sh SEE ALSO
.Xr ld 1 ,
.Xr rtld 1 ,
.Xr dladdr 3 ,
.Xr dlclose 3 ,
.Xr dlerror 3 ,
.Xr dlfunc 3 ,
.Xr dlinfo 3 ,
.Xr dl_iterate_phdr 3 ,
.Xr dlopen 3 ,
.Xr dlsym 3 ,
.Xr dlvsym 3 ,
.Xr link 5
.Sh HISTORY
Some of the
.Nm dl*
functions first appeared in SunOS 4.