process-stat/test.c at main · sinainnet/process-stat · GitHub

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#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include<errno.h>

#define DEVICE_FILENAME "/dev/mchar"

struct memory_stat_report
{
	unsigned long vmpeak;
	unsigned long vmsize;
	unsigned long vmlck;
	unsigned long vmpin;
	unsigned long vmhwm;
	unsigned long vmrss;
	unsigned long rssanon;
	unsigned long rssfile;
	unsigned long rssshmem;
	unsigned long vmdata;
	unsigned long vmstk;
	unsigned long vmexe;
	unsigned long vmlib;
	unsigned long vmpte;
	unsigned long vmswap;
	unsigned long hugetlb;
};


int main()
{
	int fd;
	int ret;
	char *p = NULL;
	char buff[64];

	fd = open(DEVICE_FILENAME, O_RDWR|O_NDELAY);

	while (1)
	{
		//usleep(100);
		int pid = getpid();
		ret = write(fd, (char*)(&pid), sizeof(pid));
		if (ret < 0) {
			printf("write error!\n");
			perror("The write error");
			if (errno == EBUSY)
				continue;

			ret = errno;
			goto out;
		}

		ret = read(fd, buff, sizeof(size_t));
		if (ret < 0) {
			printf("read error!\n");
			ret = errno;
			goto out;
		}
		printf("mypid is: %d\n", getpid());
		printf("read: %ld\n", *((size_t*)(&buff[0])));

		if(fd >= 0) {
			p = (char*)mmap(0,
					4096,
					PROT_READ | PROT_WRITE,
					MAP_SHARED,
					fd,
					0);
			struct memory_stat_report* msr = (struct memory_stat_report*)p;
			printf("VmPeak:\t%8lu kB\n" \
					"VmSize:\t%8lu kB\n" \
					"VmLck:\t%8lu kB\n" \
					"VmPin:\t%8lu kB\n" \
					"VmHWM:\t%8lu kB\n" \
					"VmRSS:\t%8lu kB\n" \
					"RssAnon:\t%8lu kB\n" \
					"RssFile:\t%8lu kB\n" \
					"RssShmem:\t%8lu kB\n" \
					"VmData:\t%8lu kB\n" \
					"VmStk:\t%8lu kB\n" \
					"VmExe:\t%8lu kB\n" \
					"VmLib:\t%8lu kB\n" \
					"VmPTE:\t%8lu kB\n" \
					"VmSwap:\t%8lu kB\n" \
					"HugetlbPages:\t%8lu kB\n",
					msr->vmpeak,
					msr->vmsize,
					msr->vmlck,
					msr->vmpin,
					msr->vmhwm,
					msr->vmrss,
					msr->rssanon,
					msr->rssfile,
					msr->rssshmem,
					msr->vmdata,
					msr->vmstk,
					msr->vmexe,
					msr->vmlib,
					msr->vmpte,
					msr->vmswap,
					msr->hugetlb);
			munmap(p, 4096);

		}
	}

	close(fd);
    //fd = open(DEVICE_FILENAME, O_RDWR|O_NDELAY);

out:
    return ret;
}