include/linux/sysrq.h

Source file repositories/reference/linux-study-clean/include/linux/sysrq.h

File Facts

System
Linux kernel
Corpus path
include/linux/sysrq.h
Extension
.h
Size
1993 bytes
Lines
84
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct sysrq_key_op {
	void (* const handler)(u8);
	const char * const help_msg;
	const char * const action_msg;
	const int enable_mask;
};

#ifdef CONFIG_MAGIC_SYSRQ

/* Generic SysRq interface -- you may call it from any device driver, supplying
 * ASCII code of the key, pointer to registers and kbd/tty structs (if they
 * are available -- else NULL's).
 */

void handle_sysrq(u8 key);
void __handle_sysrq(u8 key, bool check_mask);
int register_sysrq_key(u8 key, const struct sysrq_key_op *op);
int unregister_sysrq_key(u8 key, const struct sysrq_key_op *op);
extern const struct sysrq_key_op *__sysrq_reboot_op;

int sysrq_toggle_support(int enable_mask);
int sysrq_mask(void);

#else

static inline void handle_sysrq(u8 key)
{
}

static inline void __handle_sysrq(u8 key, bool check_mask)
{
}

static inline int register_sysrq_key(u8 key, const struct sysrq_key_op *op)
{
	return -EINVAL;
}

static inline int unregister_sysrq_key(u8 key, const struct sysrq_key_op *op)
{
	return -EINVAL;
}

static inline int sysrq_mask(void)
{
	/* Magic SysRq disabled mask */
	return 0;
}

#endif

#endif /* _LINUX_SYSRQ_H */

Annotation

Implementation Notes