bc_send_request(9)

🎀 NAME 🎀

okay so bestie, this is bc_send_request(9), straight from the Kernel API Manual ✨ and the name is literally the whole assignment: send a backchannel Call on a TCP socket 💅 no cap.

✨ SYNOPSIS ✨

int bc_send_request (struct rpc_rqst *req );

🦋 ARGUMENTS 🦋

• req — the rpc_rqst containing the Call message to be sent 🫶

💖 DESCRIPTION 💖

here's the vibe: xpt_mutex is the little bodyguard making sure rqstp's whole message gets written to the socket without interruption 😌✨. like, the entire message, no chaotic cut-ins — periodt.

Return values, bestie:

• 0 — the message was sent successfully 🎉
• ENOTCONN — the message was not sent 😭

that's the whole return-value story: 0 means it went through, ENOTCONN means it did not 💀

🌈 SEE ALSO 🌈

Kernel file ./net/sunrpc/xprtsock.c, plus the whole function friend group 🫶:

• xs_nospace(9)
• xs_local_send_request(9)
• xs_udp_send_request(9)
• xs_tcp_send_request(9)
• xs_error_report(9)
• xs_close(9)
• xs_destroy(9)
• xs_udp_data_read_skb(9)
• xs_data_ready(9)
• xs_local_state_change(9)
• xs_tcp_state_change(9)
• xs_udp_write_space(9)
• xs_tcp_write_space(9)
• xs_udp_set_buffer_size(9)
• xs_udp_timer(9)
• xs_set_port(9)
• xs_local_setup_socket(9)
• xs_enable_swap(9)
• xs_disable_swap(9)
• xs_tcp_shutdown(9)
• xs_tcp_setup_socket(9)
• xs_tls_handshake_done(9)
• xs_tcp_tls_setup_socket(9)
• xs_connect(9)
• xs_local_print_stats(9)
• xs_udp_print_stats(9)
• xs_tcp_print_stats(9)
• xs_setup_local(9)
• xs_setup_udp(9)
• xs_setup_tcp(9)
• xs_setup_tcp_tls(9)
• xs_setup_bc_tcp(9)
• init_socket_xprt(9)
• cleanup_socket_xprt(9)

and that's the whole page, bestie 🫶 source/version: ./net/sunrpc · date: October 2026 · title: bc_send_request(9) ✨💖