iucv_msg_length(9)

🎀 iucv_msg_length(9) 🎀

okay bestie, welcome to the Kernel API Manual, section 9 — this one is short but lowkey important 💅

💖 NAME 💖

iucv_msg_length — returns the length of an iucv message.

✨ SYNOPSIS ✨

size_t iucv_msg_length (struct iucv_message *msg );

🫶 ARGUMENTS 🫶

• msg — pointer to struct iucv_message; MUST NOT be NULL 🙅‍♀️

🦋 DESCRIPTION 🦋

This function returns the length of the specified iucv message msg — of the data stored in a buffer and of the data stored in the parameter list (PRMDATA) ✨

For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket data:

PRMDATA[0..6]   socket data (max 7 bytes); PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7])

The socket data length is computed by subtracting the socket data length value from 0xFF 🧮

If the socket data len is greater than 7, then PRMDATA can be used for special notifications (see iucv_sock_shutdown); and further, if the socket data len is > 7, the function returns 8 🔥

Use this function to allocate socket buffers to store iucv message data — that's the whole point, bestie 🫶

🌈 RETURN 🌈

Length of the IUCV message. periodt 💅

🔥 SEE ALSO 🔥

• Kernel file ./net/iucv/af_iucv.c
• iucv_sock_in_state(9)
• iucv_below_msglim(9)
• iucv_send_iprm(9)

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mwah 💖 — signing off from the ./net/iucv source/version, dated October 2026, bestie 🎀