sysdecode_fcntl_arg(3)

✨ sysdecode_fcntl_arg(3) — Library Functions Manual, but make it cute ✨

okay so bestie, welcome to the sysdecode_fcntl_arg(3) page — it's part of the Library Functions Manual, and it's all about describing that optional fcntl(2) argument. niche? yes. iconic? also yes. 💅

🎀 NAME 🎀

sysdecode_fcntl_arg, sysdecode_fcntl_arg_p — output description of fcntl argument

🫶 LIBRARY 🫶

library libsysdecode

🌸 SYNOPSIS 🌸

#include <sysdecode.h>

void
sysdecode_fcntl_arg(FILE *fp, int cmd, uintptr_t arg, int base);

bool
sysdecode_fcntl_arg_p(int cmd);

💅 DESCRIPTION 💅

okay so sysdecode_fcntl_arg() is the main character here: it takes the optional arg argument to fcntl(2) and outputs a text description of it to the stream fp. The type of arg and the format it gets printed in are determined by cmd — literally, cmd decides the whole vibe:

• F_SETFD — arg type: int. Output format: "FD_CLOEXEC", "FD_CLOFORK", or the value of arg in the indicated base (one of 8, 10, or 16).
• F_SETFL — arg type: int. Output format: file flags as output by sysdecode_fcntl_fileflags(3), with any unknown or remaining bits output in hexadecimal.
• F_GETLK, F_SETLK, F_SETLKW — arg type: struct flock *. Output format: the value of arg using the "%p" conversion specification.
• Others — arg type: int. Output format: the value of arg in the indicated base (one of 8, 10, or 16).

and then there's sysdecode_fcntl_arg_p() — the vibe-check function. use it to determine if a fcntl(2) command uses the optional third argument to fcntl(2). it returns true if cmd accepts a third argument to fcntl(2) and false if it does not. periodt. 💖

💖 RETURN VALUES 💖

sysdecode_fcntl_arg_p returns true if cmd accepts a third argument to fcntl(2) and false if it does not. that's the whole return-value story, bestie — no extra plot twists. 🫶

🦋 SEE ALSO 🦋

• sysdecode(3)
• sysdecode_fcntl_cmd(3)
• sysdecode_fcntl_fileflags(3)

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💖 that's the whole page, bestie. this one is sysdecode_fcntl_arg(3), from Debian, dated November 24, 2017. go decode and slay. 💅✨