SIGDELSET(3POSIX)

📦 version 2017a, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu resolute, ubuntu stonking

✨ SIGDELSET(3POSIX) ✨

okay bestie, so this little cutie lives in the POSIX Programmer's Manual 💖 and her whole job is removing one singular signal from a signal set. one. single. signal. she's very focused like that. 💅

🌸 PROLOG 🌸

so like, quick vibe check before we get into it: this manual page is part of the POSIX Programmer's Manual. 🫶

⚠️ heads up bestie — the Linux implementation of this interface may differ (so go consult the corresponding Linux manual page for the details on Linux behavior), or honestly the interface may not even be implemented on Linux at all. it's giving "check your local listings." 💀

👑 NAME 👑

sigdelset — delete a signal from a signal set 🎀

like, one signal. poof. gone. not the whole set, just the one. periodt.

🦋 SYNOPSIS 🦋

#include <signal.h>

int sigdelset(sigset_t *set, int signo);

💖 DESCRIPTION 💖

so the sigdelset() function deletes the individual signal specified by signo from the signal set pointed to by set. that's it, that's the whole job, and she ate. 🔥

now here's the important part, and I need you to listen bestie: applications should call either sigemptyset() or sigfillset() at least once for each object of type sigset_t prior to any other use of that object. like, initialize your set first. be a responsible main character. 🧚

💀 and if such an object is not initialized in this way, but is nonetheless supplied as an argument to any of pthread_sigmask(), sigaction(), sigaddset(), sigdelset(), sigismember(), sigpending(), sigprocmask(), sigsuspend(), sigtimedwait(), sigwait(), or sigwaitinfo(), the results are undefined. undefined!! not "a little weird", not "probably fine" — undefined. no cap. 😭

⭐ RETURN VALUE ⭐

upon successful completion, sigdelset() shall return 0. 🎉

otherwise, it shall return -1 and set errno to indicate the error. 💅

🎀 ERRORS 🎀

the sigdelset() function may fail if:

  • EINVAL — the signo argument is not a valid signal number, or is an unsupported signal number. 😤 like, that's not a real signal babe.

the following sections are informative. ✨ (yes literally, that's what it says — they're the bonus content, not the rules)

🌈 EXAMPLES 🌈

None. 🙈

💜 APPLICATION USAGE 💜

None. 🙈

🍓 RATIONALE 🍓

None. 🙈

🌸 FUTURE DIRECTIONS 🌸

None. 🙈

🫶 SEE ALSO 🫶

  • Section 2.4, Signal Concepts 📡
  • pthread_sigmask()
  • sigaction()
  • sigaddset()
  • sigemptyset()
  • sigfillset()
  • sigismember()
  • sigpending()
  • sigsuspend()

and from The Base Definitions volume of POSIX.1‐2017: <signal.h> 💖

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 .

okay that's the whole thing bestie, we did it, we read a manpage together 💖 this one's from IEEE/The Open Group, dated 2017, and it's the SIGDELSET(3POSIX) page itself — slay, no cap, go delete a signal responsibly. 🌟🦋💅

📦 where this page comes from