kernel.h

LINUX1.0内核源代码,学习LINUX编程的一定要看。

#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H

/*
 * 'kernel.h' contains some often-used function prototypes etc
 */

#ifdef __KERNEL__

#include <linux/linkage.h>

#define INT_MAX		((int)(~0U>>1))
#define UINT_MAX	(~0U)
#define LONG_MAX	((long)(~0UL>>1))
#define ULONG_MAX	(~0UL)

#define	KERN_EMERG	"<0>"	/* system is unusable			*/
#define	KERN_ALERT	"<1>"	/* action must be taken immediately	*/
#define	KERN_CRIT	"<2>"	/* critical conditions			*/
#define	KERN_ERR	"<3>"	/* error conditions			*/
#define	KERN_WARNING	"<4>"	/* warning conditions			*/
#define	KERN_NOTICE	"<5>"	/* normal but significant condition	*/
#define	KERN_INFO	"<6>"	/* informational			*/
#define	KERN_DEBUG	"<7>"	/* debug-level messages			*/

#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
# define NORET_TYPE    __volatile__
# define ATTRIB_NORET  /**/
# define NORET_AND     /**/
#else
# define NORET_TYPE    /**/
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,
#endif

extern void math_error(void);
NORET_TYPE void panic(const char * fmt, ...)
	__attribute__ ((NORET_AND format (printf, 1, 2)));
NORET_TYPE void do_exit(long error_code)
	ATTRIB_NORET;
unsigned long simple_strtoul(const char *,char **,unsigned int);
int sprintf(char * buf, const char * fmt, ...);

int session_of_pgrp(int pgrp);

int kill_proc(int pid, int sig, int priv);
int kill_pg(int pgrp, int sig, int priv);
int kill_sl(int sess, int sig, int priv);

asmlinkage int printk(const char * fmt, ...)
	__attribute__ ((format (printf, 1, 2)));

/*
 * This is defined as a macro, but at some point this might become a
 * real subroutine that sets a flag if it returns true (to do
 * BSD-style accounting where the process is flagged if it uses root
 * privs).  The implication of this is that you should do normal
 * permissions checks first, and check suser() last.
 */
#define suser() (current->euid == 0)

#endif /* __KERNEL__ */

#define SI_LOAD_SHIFT	16
struct sysinfo {
	long uptime;			/* Seconds since boot */
	unsigned long loads[3];		/* 1, 5, and 15 minute load averages */
	unsigned long totalram;		/* Total usable main memory size */
	unsigned long freeram;		/* Available memory size */
	unsigned long sharedram;	/* Amount of shared memory */
	unsigned long bufferram;	/* Memory used by buffers */
	unsigned long totalswap;	/* Total swap space size */
	unsigned long freeswap;		/* swap space still available */
	unsigned short procs;		/* Number of current processes */
	char _f[22];			/* Pads structure to 64 bytes */
};

#endif