KILLPG(3POSIX)

💅 KILLPG(3POSIX) — POSIX Programmer's Manual 🎀

okay bestie, welcome to the group chat. this one lives in the POSIX Programmer's Manual, and here's the lil disclaimer before we even start: the Linux implementation of this interface may differ from what's written here (so pls consult the corresponding Linux manual page for the deets on Linux behavior), or the interface might not even be implemented on Linux at all. 🙈 just so you know.

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✨ PROLOG ✨

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.

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🌸 NAME 🌸

killpg — send a signal to a process group 🫶

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🦋 SYNOPSIS 🦋

#include <signal.h>

int killpg(pid_t pgrp, int sig);

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💖 DESCRIPTION 💖

The killpg() function shall send the signal specified by sig to the process group specified by pgrp. like, you point at a whole squad of processes and you're like "hey, this is for all of y'all." 📣

If pgrp is greater than 1, then killpg(pgrp, sig) shall be equivalent to kill(-pgrp, sig). (yes, it's literally the same thing wearing a different outfit. iconic behavior.) ✨

If pgrp is less than or equal to 1, the behavior of killpg() is undefined. 🚨 not a vibe. don't do that.

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🔥 RETURN VALUE 🔥

Refer to kill().

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💀 ERRORS 💀

Refer to kill().

The following sections are informative.

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🎀 EXAMPLES 🎀

💌 Sending a Signal to All Other Members of a Process Group

The following example shows how the calling process could send a signal to all other members of its process group. To prevent itself from receiving the signal, it first makes itself immune to the signal by ignoring it. (self-care, honestly. 🧚)

#include <signal.h>
#include <unistd.h>
...
    if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
        /* Handle error */;

    if (killpg(getpgrp(), SIGUSR1) == -1)
        /* Handle error */;"

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🌈 APPLICATION USAGE 🌈

None.

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⭐ RATIONALE ⭐

None.

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🍓 FUTURE DIRECTIONS 🍓

None.

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👑 SEE ALSO 👑

• getpgid()
• getpid()
• kill()
• raise()

The Base Definitions volume of POSIX.1‐2017, <signal.h>

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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!! this one was brought to you by IEEE/The Open Group, dated 2017, and it answers to the name KILLPG(3POSIX) — no cap. now go forth and signal your whole process group responsibly, mwah 💋✨