分类:
2010-09-14 14:11:09
(一)获取磁盘的动态使用状况
其实系统的动态信息都可以从Solaris里的kstat工具得到。vmstat之类的工具都是基于kstat。有一篇很好的文章讲了kstat的基本知识和数据结构,要想写出适合自己要求的系统监控代码,应该先看看这篇文章:http://developers.sun.com/solaris/articles/kstatc.html
以下的例子就是根据这篇文章里的代码改写的。
#include
#include
#include
#define SLEEPTIME 5
unsigned int sleep(unsigned int);
void my_io_display(char *, char *, kstat_io_t);
main(int argc, char *argv[])
{
kstat_ctl_t *kc;
kstat_t *ksp;
kstat_io_t kio;
kc = kstat_open();
while(1) {
if(kstat_chain_update(kc))
ftf(stderr, "<
for (ksp = kc->kc_chain; ksp != NULL; ksp = ksp->ks_next) {
if (ksp->ks_type == KSTAT_TYPE_IO &;& strcmp(ksp->ks_class,"disk") == 0) {
kstat_read(kc, ksp, &kio);
my_io_display(ksp->ks_name, ksp->ks_class, kio);
}
}
sleep(SLEEPTIME);
} /* while(1) */
}
void my_io_display(char *devname, char *class, kstat_io_t k)
{
printf("Name: %s Class: %sn",devname,class);
printf("tnumber of bytes read %lldn", k.nread);
printf("tnumber of bytes written %lldn", k.nwritten);
printf("tnumber of read operations %dn", k.reads);
printf("tnumber of write operations %dn", k.writes);
}
(二)获取内存的动态使用状况
这个稍微麻烦点儿,因为kstat的vminfo保存的是自系统启动以来累计信息,因此要计算两次采样时间之间的差值。
#include
#include
#include
#include
#include
#define SLEEPTIME 5
#define pgtok(a) ((a) * (pagesize >> 10))
unsigned int sleep(unsigned int);
main(int argc, char *argv[])
{
kstat_ctl_t *kc;
kstat_t *ksp;
vminfo_t vminfo, old_vminfo;
int pagesize = sysconf(_SC_PAGESIZE);
kc = kstat_open();
ksp = kstat_lookup(kc, NULL, -1,"vminfo");
kstat_read(kc, ksp, &old_vminfo);
sleep(SLEEPTIME);
while(1) {
if(kstat_chain_update(kc))
fprintf(stderr, "<
ksp = kstat_lookup(kc, NULL, -1,"vminfo");
kstat_read(kc, ksp, &vminfo);
printf("Free memory: %uKBn", pgtok((vminfo.freemem - old_vminfo.freemem)/SLEEPTIME));
printf("Swap allocated: %uKBn", pgtok((vminfo.swap_alloc - old_vminfo.swap_alloc)/SLEEPTIME));
printf("Swap available: %ukBn", pgtok((vminfo.swap_avail - old_vminfo.swap_avail)/SLEEPTIME));
kstat_read(kc, ksp, &old_vminfo); /* you can use memcpy instead to store the old */
printf("n");
sleep(SLEEPTIME);
} /* while(1) */
}
你还可以用kstat写一个cpu使用状况的程序,这个就交给你自己去联系了,呵呵。如果想不出来,就去看看mpstat的源码。
(三)获取物理内存信息。
这很简单,参考opensolaris里的prtconf.c。用sysconf系统调用。
#include
#include
#include
main()
{
uint32_t pagesize;
uint64_t phy_pages;
pagesize = (uint32_t) sysconf (_SC_PAGE_SIZE);
phy_pages = (uint64_t) sysconf (_SC_PHYS_PAGES);
printf("Physical memory: %lu MBn", (pagesize * phy_pages) >> 20);
}
(四)获取文件系统的使用情况。
这个就用不到kstat了。需要读取mount table, 结合statvfs调用。
#include
#include
#include
#include
#include
#include
#define MNTTAB "/etc/mnttab"
main()
{
struct statvfs fsstat;
struct mnttab my_mnttab;
FILE *fp;
fp = fopen(MNTTAB, "r");
if (fp == NULL) {
printf("Unable to open mount table.n");
exit(-1);
}
while (getmntent(fp, &my_mnttab) == 0){
if (strncmp(my_mnttab.mnt_fstype, "ufs", 3) != 0)
continue;
memset(&fsstat, 0, sizeof(struct statvfs));
if (statvfs(my_mnttab.mnt_mountp, &fsstat) == 0) {
printf("File System: %sn", my_mnttab.mnt_mountp);
printf("tSpace Total: %lu KBn",
fsstat.f_blocks * (fsstat.f_frsize >> 10) );
printf("tSpace Available: %lu KBn",
fsstat.f_bavail * (fsstat.f_frsize >> 10) );
printf("n");
}
} /* end of while */
}
(五)获取网卡信息和IP地址
这个嘛,开个socket,再用ioctl把有关的信息拿到。opensolaris里有个程序,现成的,连测试的main函数都替你写好了: