EXPLAIN_GETGROUPLIST_OR_DIE(3)

💖 EXPLAIN_GETGROUPLIST_OR_DIE 💖

okay bestie, so this is a page from the Library Functions Manual, and it's all about explain_getgrouplist_or_die — the function that grabs a user's group list and screams into the void if anything goes wrong. no cap. ✨

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🌸 NAME 🌸

explain_getgrouplist_or_die — get list of groups and report errors 💅

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🦋 SYNOPSIS 🦋

#include <libexplain/getgrouplist.h>
void explain_getgrouplist_or_die(const char *user, gid_t group, gid_t
*groups, int *ngroups);
int explain_getgrouplist_on_error(const char *user, gid_t group, gid_t
*groups, int *ngroups);

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✨ DESCRIPTION ✨

so like, the explain_getgrouplist_or_die function is the one you call when you wanna invoke the getgrouplist(3) system call. if it fails, an explanation gets printed to stderr — and that explanation comes from the explain_getgrouplist(3) function — and then the process literally just dies by calling exit(EXIT_FAILURE). it's giving main character exit. 😭

meanwhile explain_getgrouplist_on_error is the chill sibling: it also calls the getgrouplist(3) system call, and on failure it still prints that same explanation to stderr from explain_getgrouplist(3), but it still returns to the caller instead of ending everything. so much more emotionally stable fr fr. 🫶

now the args, one by one:

• user — the user, exactly as to be passed to the getgrouplist(3) system call. yes, exactly. don't get creative with it. 🙈
• group — the group, exactly as to be passed to the getgrouplist(3) system call.
• groups — the groups, exactly as to be passed to the getgrouplist(3) system call.
• ngroups — the ngroups, exactly as to be passed to the getgrouplist(3) system call.

(they're all "exactly as to be passed" because you're just forwarding them straight through, bestie. no funny business, no seasoning, no nothing. the function is the messenger, not the chef. 🍓)

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👑 RETURN VALUE 👑

explain_getgrouplist_or_die only returns on success — and if you wanna know more about what success looks like, go check getgrouplist(3). on failure it prints an explanation and exits, so like… it does not return. it's gone. it left the chat. 💀

explain_getgrouplist_on_error always returns the value returned by the wrapped getgrouplist(3) system call. every single time. it's reliable like that. ✨

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🌈 EXAMPLE 🌈

the explain_getgrouplist_or_die function is intended to be used in a fashion similar to the following example:

explain_getgrouplist_or_die(user, group, groups, ngroups);

look at that. four arguments, one dream. slay. 💅

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💜 SEE ALSO 💜

• getgrouplist(3) — get list of groups to which a user belongs
• explain_getgrouplist(3) — explain getgrouplist(3) errors
• exit(2) — terminate the calling process

iykyk, these are the ones you're gonna wanna peek at next. 🔥

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🎀 COPYRIGHT 🎀

libexplain version 1.4 Copyright (C) 2013 Peter Miller

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and that's the whole page, bestie!! this lil manual page for explain_getgrouplist_or_die(3) came to you courtesy of libexplain version 1.4, copyright (C) 2013 Peter Miller — big thanks to them, absolute icons, no notes. 👑🌸 go forth and get those group lists. 💖