dlfcn.h(7POSIX) POSIX Programmer's Manual dlfcn.h(7POSIX)
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of
this interface may differ (consult the corresponding Linux manual page for details of
Linux behavior), or the interface may not be implemented on Linux.
dlfcn.h — dynamic linking
The <dlfcn.h> header shall define at least the following symbolic constants for use in the
construction of a dlopen() mode argument:
RTLD_LAZY Relocations are performed at an implementation-defined time.
RTLD_NOW Relocations are performed when the object is loaded.
RTLD_GLOBAL All symbols are available for relocation processing of other modules.
RTLD_LOCAL All symbols are not made available for relocation processing by other mod‐
The following shall be declared as functions and may also be defined as macros. Function
prototypes shall be provided.
int dlclose(void *);
void *dlopen(const char *, int);
void *dlsym(void *restrict, const char *restrict);
The following sections are informative.
The System Interfaces volume of POSIX.1‐2008, dlclose(), dlerror(), dlopen(), dlsym()
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2013 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the event of any discrep‐
ancy between this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original Standard can be
obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have
been introduced during the conversion of the source files to man page format. To report
such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 dlfcn.h(7POSIX)