netlink_set_err(9)

✨ netlink_set_err(9) ✨

okay so bestie, welcome to another ✨iconic✨ page from the Kernel API Manual — this one is netlink_set_err, and it's literally the "hey everyone, something went wrong" broadcaster of the netlink world 💅

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🌸 NAME 🌸

netlink_set_err — report error to broadcast listeners 💖 (yes, that's the whole vibe: tell the broadcast fam that something broke)

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🎀 SYNOPSIS 🎀

int netlink_set_err (struct sock *ssk , u32 portid , u32 group , int
code );

that's the whole signature, no cap ✨ four args and a return type, and we're gonna go through every single one 🫶

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🦋 ARGUMENTS 🦋

• ssk — the kernel netlink socket, as returned by netlink_kernel_create. like, this is your main character socket, the one doing the broadcasting 👑
• portid — the PORTID of a process that we want to skip (if any). so if someone shouldn't get the notif, you put their PORTID here 🙈 (it's optional, hence the "if any")
• group — the broadcast group that will notice the error. like, this is the group chat that's about to get the bad news 💀
• code — error code, must be negative (as usual in kernelspace). yes bestie, negative — kernelspace does it that way, that's just the rules 🧚

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🌈 DESCRIPTION 🌈

so here's what it does: this function returns the number of broadcast listeners that have set the NETLINK_NO_ENOBUFS socket option ⭐

that's it. that's the whole thing. it's giving "simple but specific" energy 🔥

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👑 SEE ALSO 👑

• Kernel file ./net/netlink/af_netlink.c
• __netlink_ns_capable(9)
• netlink_ns_capable(9)
• netlink_capable(9)
• netlink_net_capable(9)
• netlink_change_ngroups(9)
• nlmsg_notify(9)

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💖 go read those too, iykyk — they're all part of the netlink family and they're all lowkey important 🫶

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okay that's the page!! 🎀 sign-off time: this cutie lives in ./net/netlink, the version/date on it is October 2026, and the manual is netlink_set_err(9). mwah, go forth and broadcast responsibly 💅💜