arch/um/include/shared/irq_user.h

File Facts

System

Linux kernel

Corpus path

arch/um/include/shared/irq_user.h

Extension

.h

Size

654 bytes

Lines

28

Domain

Architecture Layer

Bucket

arch/um

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• sysdep/ptrace.h

Detected Declarations

• struct siginfo
• enum um_irq_type

Annotated Snippet

#ifndef __IRQ_USER_H__
#define __IRQ_USER_H__

#include <sysdep/ptrace.h>

enum um_irq_type {
	IRQ_READ,
	IRQ_WRITE,
	NUM_IRQ_TYPES,
};

struct siginfo;
extern void sigio_handler(int sig, struct siginfo *unused_si,
			  struct uml_pt_regs *regs, void *mc);
extern void sigchld_handler(int sig, struct siginfo *unused_si,
			   struct uml_pt_regs *regs, void *mc);
void sigio_run_timetravel_handlers(void);
extern void free_irq_by_fd(int fd);
extern void deactivate_fd(int fd, int irqnum);
extern int deactivate_all_fds(void);

#endif

Annotation

• Immediate include surface: `sysdep/ptrace.h`.
• Detected declarations: `struct siginfo`, `enum um_irq_type`.
• Atlas domain: Architecture Layer / arch/um.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.