kern_info.c

一个基于linux的TCP/IP协议栈的实现

#include <linux/unistd.h>
#include <linux/types.h>
#include <linux/sysctl.h>
#include <stdio.h>

_syscall1(int, _sysctl, struct __sysctl_args *, args);
int sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
				void *newval, size_t newlen)
{
	struct __sysctl_args args={name,nlen,oldval,oldlenp,newval,newlen};
	return _sysctl(&args);
}

#define SIZE(x) sizeof(x)/sizeof(x[0])
#define OSNAMESZ 100
#define OSRELEASESZ 256

char osname[OSNAMESZ];
char osrelease[OSRELEASESZ];
int osnamelth;
int name[] = { CTL_KERN, KERN_OSTYPE };
int osreleaseth;
int release[] = { CTL_KERN, KERN_OSRELEASE };

main(){
	osnamelth = sizeof(osname);
	if (sysctl(name, SIZE(name), osname, &osnamelth, 0, 0)){
		perror("sysctl");
		return -1;
	}
	osreleaseth = sizeof(osrelease);
	if(sysctl(release, SIZE(release), osrelease, &osreleaseth, 0, 0)){
		perror("sysctl");
		return -1;
	}
		
	printf("This machine is running %s %s\n", osname, osrelease);
	return 0;
}