The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> dlfcn.h - dynamic linking

#### SYNOPSIS

> `#include <dlfcn.h>`

#### DESCRIPTION

> 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 modules.

> The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

>     int    dlclose(void *);
>     char  *dlerror(void);
>     void  *dlopen(const char *, int);
>     void  *dlsym(void *restrict, const char *restrict);

The following sections are informative.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> XSH dlclose, dlerror, dlopen, dlsym

#### CHANGE HISTORY

> First released in Issue 5.

#### Issue 6

> The restrict keyword is added to the prototype for dlsym().

#### Issue 7

> The <dlfcn.h> header is moved from the XSI option to the Base.

> This reference page is clarified with respect to macros and symbolic constants.

End of informative text.

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