FD_CLR(3P)

👑 FD_CLR(3P) — straight out of the POSIX Programmer's Manual 💖

okay bestie, we're in the POSIX Programmer's Manual today, and this little entry is all about the macros that run synchronous I/O multiplexing. she's short, she's iconic, she's the group chat of file descriptor sets. let's go ✨

🌸 PROLOG 🌸

so like, heads up before anything else:

this manual page is part of the POSIX Programmer's Manual. the Linux implementation of this interface may differ — so if you're on Linux, go consult the corresponding Linux manual page for the details of Linux behavior. OR, plot twist, the interface might not even be implemented on Linux at all 😭💀

not me warning you about portability before you've even read the function names. that's just how POSIX rolls 🫶

🎀 NAME 🎀

FD_CLR — macros for synchronous I/O multiplexing 💅

like, that's the whole vibe. macros. for synchronous I/O multiplexing. periodt.

✨ SYNOPSIS ✨

#include <sys/select.h>

void FD_CLR(int fd, fd_set *fdset);
int FD_ISSET(int fd, fd_set *fdset);
void FD_SET(int fd, fd_set *fdset);
void FD_ZERO(fd_set *fdset);

look at her. four little macros. four. FD_CLR, FD_ISSET, FD_SET, FD_ZERO. a whole squad 🌈

🦋 DESCRIPTION 🦋

bestie, this is the shortest description in the whole building:

refer to pselect().

that's it. that's the description. she's pointing you at her friend and honestly? respect. no cap. go read pselect() for the actual tea ☕

💜 COPYRIGHT 💜

okay so legally I have to say this part very carefully, so here it is, word for word, no edits, because copyright is not the place to freestyle 🙈:

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 .

lowkey important: if this page and the original IEEE / The Open Group Standard ever disagree, the original Standard wins. she's the main character, this page is just the understudy 💅

and that's the whole page, bestie!! 🎀 no SEE ALSO section on this one, she's minimal like that. this came to you from IEEE/The Open Group, 2017 — mwah, love that for us. now go read pselect() fr fr 💖✨🦋