分类:
2008-04-07 17:53:32
来自xinfeng blog http://blog.gceclub.sun.com.cn/index.php?op=ViewArticle&articleId=1222&blogId=520
(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 #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)) fprintf(stderr, "< >n"); 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, "< >n"); 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 value */ 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: