dlfcn.h(0P)

✨ dlfcn.h(0P) — POSIX Programmer's Manual ✨

okay bestie, welcome to the POSIX Programmer's Manual 💅 this is dlfcn.h(0P), and we're gonna talk about dynamic linking like it's the group chat drama it truly is 🦋

⚠️ real talk first: 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. no cap, check ur local manpage before u come for me 🙈

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🎀 NAME 🎀

dlfcn.h — dynamic linking. that's it, that's the vibe 💖

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🌸 SYNOPSIS 🌸

#include <dlfcn.h>

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💜 DESCRIPTION 💜

so the <dlfcn.h> header shall define at least these symbolic constants, and they're specifically for building a dlopen() mode argument. like, this is the whole point of them, they're mode-argument girlies 👑

• RTLD_LAZY — relocations are performed at an implementation-defined time. iykyk, it's whenever ur implementation feels like it ✨
• RTLD_NOW — relocations are performed when the object is loaded. no waiting, no suspense, main character energy, periodt 🔥
• RTLD_GLOBAL — all symbols are available for relocation processing of other modules. sharing is caring fr fr 🫶
• RTLD_LOCAL — all symbols are not made available for relocation processing by other modules. keeping it private, lowkey mysterious 💅

and the following shall be declared as functions and may also be defined as macros. function prototypes shall be provided. not optional bestie, prototypes ARE happening 🎀

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

The following sections are informative. (aka: the chill sections, not the mandatory ones 🌈)

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🧚 APPLICATION USAGE 🧚

None. literally nothing. a whole section of nothing. iconic honestly 😭

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🍓 RATIONALE 🍓

None. also nothing. the silence is giving mysterious ⭐

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🦋 FUTURE DIRECTIONS 🦋

None. the future is... blank. no notes 👑

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🌈 SEE ALSO 🌈

• The System Interfaces volume of POSIX.1‐2017, dlclose(), dlerror(), dlopen(), dlsym()

go read those, they're the sequels and they ate 💖

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💖 COPYRIGHT 💖

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy 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.opengroup.org/unix/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 .

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and that's the whole page bestie!! brought to u by IEEE/The Open Group, dated 2017, filed under dlfcn.h(0P) — go forth and dlopen() responsibly 🫶💅✨