append_tid(9)

🦋 append_tid: bestie edition 💅

okay so this is the append_tid(9) page from the Kernel API Manual, and it's literally here to help you append a thread ID to a string. no cap. 🫶

🌸 NAME 🌸

append_tid — append thread ID to the given string. periodt. 💖

✨ SYNOPSIS ✨

int append_tid (char *str , size_t sz );

🎀 ARGUMENTS 🎀

• str — the string you're extending, bestie. ✨
• sz — the string's size. that's the size of the string, iykyk. 💅

💫 DESCRIPTION 💫

okay so 8 characters are used to append the thread ID (7 digits + ' '). the way that's such a specific little format. 😭

it returns -1 on errors, and 0 otherwise. that's the whole vibe check. ✅

🔥 SEE ALSO 🔥

• Kernel file ./tools/testing/selftests/bpf/network_helpers.h
• open_netns(9)
• csum_tcpudp_magic(9)
• csum_ipv6_magic(9)
• build_udp_v4_csum(9)
• build_udp_v6_csum(9)
• tc_prog_attach(9)

mwah 🫶 this cute little page lives in ./tools/testing/selftests/bpf, dated October 2026, and it's the append_tid(9) manual page. go off, bestie. 🌈👑