MODBUS_TCP_PI_ACCEPT(3)

💖 MODBUS_TCP_PI_ACCEPT 💖

okay bestie, so this one is from the libmodbus manual, section 3 (that's the library functions girlies 💅), and it's literally all about modbus_tcp_pi_accept — accepting a brand new connection on a TCP PI Modbus socket, and yes she's the IPv6 one, periodt. 🌈

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✨ NAME ✨

modbus_tcp_pi_accept — accept a new connection on a TCP PI Modbus socket (IPv6) 🦋

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✨ SYNOPSIS ✨

int modbus_tcp_pi_accept(modbus_t *ctx, int *'s);

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✨ DESCRIPTION ✨

So here's the tea, bestie 🫖: modbus_tcp_pi_accept() shall pull the first connection off the queue of pending connections, spin up a brand new socket, and stash it in the libmodbus context you handed over as an argument. main character behaviour fr fr 👑

And the cute lil bonus: if it's available, she'll call accept4() with SOCK_CLOEXEC instead of plain old accept(). glow-up moment ✨

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✨ RETURN VALUE ✨

If everything goes right, you get a new socket back. slay. 💖

If not? She returns -1 and sets errno. 😭 not the vibe, but that's the deal.

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✨ EXAMPLE ✨

For the full detailed example, go peek at the unit-test-server.c source file in the tests directory. iykyk 📁

...

ctx = modbus_new_tcp_pi("::0", 502);
s = modbus_tcp_pi_listen(ctx, 1);
modbus_tcp_pi_accept(ctx, &s);

...

close(s)
modbus_free(ctx);

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✨ SEE ALSO ✨

• modbus_tcp_pi_accept(3)
• modbus_tcp_listen(3)
• modbus_tcp_pi_listen(3)

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✨ AUTHORS ✨

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com> 🫶

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okay that's the whole page, no cap 💯

libmodbus v3.1.6 · 11/17/2025 — mwah, love u, bye bestie 🎀🌸💜