SETEGID(3P)

📦 version 2017a, in alpine 3.22, alpine 3.23, alpine 3.24, arch rolling, nixpkgs unstable, opensuse-leap 16.0

💖 SETEGID(3P) — the POSIX Programmer's Manual, bestie edition 💖

okay so before we even get into it — this page lives in the POSIX Programmer's Manual, and the Linux implementation of this interface may differ (so like, go check the corresponding Linux manual page for the deets on Linux behavior), or honestly the interface might just not be implemented on Linux at all. 🙈

✨ 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.

🌸 NAME 🌸

setegid — set the effective group ID. that's it, that's the whole vibe. 👑

🎀 SYNOPSIS 🎀

#include <unistd.h>

int setegid(gid_t gid);

💅 DESCRIPTION 💅

okay so here's the tea ☕ — if gid is equal to the real group ID or the saved set-group-ID, or if the process has appropriate privileges, then setegid() shall set the effective group ID of the calling process to gid. periodt.

and the way that it does that — the real group ID, the saved set-group-ID, and any supplementary group IDs shall remain unchanged. no touching, no meddling. 🫶

also, setegid() shall not affect the supplementary group list in any way. like, at all. not even a little. 💀

⭐ RETURN VALUE ⭐

upon successful completion, 0 shall be returned. iconic. ✨

otherwise, -1 shall be returned and errno is set to indicate the error. 😭

🔥 ERRORS 🔥

the setegid() function shall fail if:

  • EINVAL — the value of the gid argument is invalid and is not supported by the implementation.
  • EPERM — the process does not have appropriate privileges and gid does not match the real group ID or the saved set-group-ID.
the following sections are informative — so like, cute context, but not the actual rules, bestie. 🙈

🌈 EXAMPLES 🌈

None.

🦋 APPLICATION USAGE 🦋

None.

💜 RATIONALE 💜

Refer to the RATIONALE section in setuid().

🧚 FUTURE DIRECTIONS 🧚

None.

👑 SEE ALSO 👑

  • exec
  • getegid()
  • geteuid()
  • getgid()
  • getuid()
  • seteuid()
  • setgid()
  • setregid()
  • setreuid()
  • setuid()

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

and that's a wrap bestie 🎀 this whole thing was brought to you by IEEE/The Open Group, 2017 — the SETEGID(3P) page, signed, sealed, slayed. 💖 go set some group IDs responsibly, ily, mwah 🫶✨

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