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#include <sys/vfs.h>    /* »òÕß <sys/statfs.h> */
int statfs(const char *path, struct statfs *buf);
int fstatfs(int fd, struct statfs *buf);
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path: λÓÚÐèÒª²éѯÐÅÏ¢µÄÎļþϵͳµÄÎļþ·¾¶Ãû(²»ÊÇÉ豸Ãû£¬ÊǹÒÔØµãÃû³Æ)¡£    
fd£º λÓÚÐèÒª²éѯÐÅÏ¢µÄÎļþϵͳµÄÎļþÃèÊö´Ê¡£
buf£ºÒÔϽṹÌåµÄÖ¸Õë±äÁ¿£¬ÓÃÓÚ´¢´æÎļþϵͳÏà¹ØµÄÐÅÏ¢
struct statfs
{
   long    f_type;     /* ÎļþϵͳÀàÐÍ  */
   long    f_bsize;    /* ¾­¹ýÓÅ»¯µÄ´«Êä¿é´óС  */
   long    f_blocks;   /* ÎļþϵͳÊý¾Ý¿é×ÜÊý */
   long    f_bfree;    /* ¿ÉÓÿéÊý */
   long    f_bavail;   /* ·Ç³¬¼¶Óû§¿É»ñÈ¡µÄ¿éÊý */
   long    f_files;    /* Îļþ½áµã×ÜÊý */
   long    f_ffree;    /* ¿ÉÓÃÎļþ½áµãÊý */
   fsid_t  f_fsid;     /* Îļþϵͳ±êʶ */
   long    f_namelen;  /* ÎļþÃûµÄ×î´ó³¤¶È */
};
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