ni_check_trigger_arg_roffs(9)

✨ ni_check_trigger_arg_roffs ✨

okay so bestie, welcome to the Kernel API Manual 💅 this one's literally called ni_check_trigger_arg_roffs(9) and it's a whole vibe check for trigger arguments, i promise it's not as scary as it sounds 🫶

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🌸 NAME 🌸

ni_check_trigger_arg_roffs — checks the trigger argument (*_arg) of an NI device to make sure the *_arg value corresponds to either a valid register value that defines a trigger source, or a valid NI signal/terminal name that has a valid route to the destination on that particular device. no cap, it's doing double duty ✨

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🦋 SYNOPSIS 🦋

int ni_check_trigger_arg_roffs (int src , const int dest , const struct
ni_route_tables *tables , const int direct_reg_offset );

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🎀 ARGUMENTS 🎀

• src — either a direct register value or one of the NI_* signal names. it's giving "pick a lane" but honestly both lanes are valid 💁‍♀️
• dest — the global-identifier for the route destination. like, where are we going, bestie? 📍
• tables — pointer to the relevant set of routing tables. the receipts, the lore, the maps 👑
• direct_reg_offset — compatibility compensation argument. this one lets us arbitrarily apply an offset to src if src is a direct register value reference. why? because we gotta stay compatible with definitions of register values as previously exported directly to user space. lowkey a legacy thing but it's iconic and we respect it 🫡

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🔥 RETURN 🔥

• 0 if the src (either register value or NI signal/terminal name) is valid for the destination 💖
• -EINVAL otherwise 😭 (the vibe check failed, sorry bestie)

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/comedi/drivers/ni_routes.h
• struct ni_route_set(9)
• struct ni_device_routes(9)
• struct ni_route_tables(9)
• route_is_valid(9)
• route_register_is_valid(9)
• ni_get_reg_value_roffs(9)

go read those if you want the full cinematic universe, fr fr 📚✨

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ngl if you got a -EINVAL back, something in your src/dest situation is NOT it, and you should go reread those structs above before you come for this function 💀

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and that's the whole page, bestie 🎀 this gem lives over in ./drivers/comedi/drivers , dated October 2026 , and it's filed under ni_check_trigger_arg_roffs(9) — slay, you're welcome, mwah 💜🧚‍♀️