(20)-3.5 文件IO基本操作四

文件IO基本操作四

stat()1.stat命令stat文件名查看文件属性信息2.函数stat()#include<sys/types.h>#include<sys/stat.h>#include<unistd.h>

intstat(constchar*path,structstat*buf);intfstat(intfd,structstat*buf);intlstat(constchar*path,structstat*buf);（1）函数原型2.函数stat()structstat{ dev_t

st_dev;

/*IDofdevicecontainingfile*/ ino_t

st_ino;

/*inodenumber*/ mode_t

st_mode;

/*protection*/ nlink_t

st_nlink;

/*numberofhardlinks*/ uid_t

st_uid;

/*userIDofowner*/ gid_t

st_gid;

/*groupIDofowner*/ dev_t

st_rdev;

/*deviceID(ifspecialfile)*/ off_t

st_size;

/*totalsize,inbytes*/ blksize_tst_blksize;/*blocksizeforfilesystemI/O*/ blkcnt_t

st_blocks;

/*numberof512Bblocksallocated*/ time_t

st_atime;

/*timeoflastaccess*/ time_t

st_mtime;

/*timeoflastmodification*/ time_t

st_ctime;

/*timeoflaststatuschange*/};（2）structstat结构体2.函数stat()……memset(&buf,0,sizeof(buf));ret=stat(PATHNAME,&buf);if(ret<0){perror("staterror");exit(-1);}printf("inode=%d.\n",buf.st_ino);printf("size=%dbytes.\n",buf.st_size);printf("st_blksize=%d.\n",buf.st_blksize);printf("st_blocks=%d.\n",buf.st_blocks);……示例1（2）structstat结构体2.函数stat()structstat{ dev_t

st_dev;

/*IDofdevicecontainingfile*/ ino_t

st_ino;

/*inodenumber*/

mode_t

st_mode;

/*protection*/ nlink_t

st_nlink;

/*numberofhardlinks*/ uid_t

st_uid;

/*userIDofowner*/ gid_t

st_gid;

/*groupIDofowner*/ dev_t

st_rdev;

/*deviceID(ifspecialfile)*/ off_t

st_size;

/*totalsize,inbytes*/ blksize_tst_blksize;/*blocksizeforfilesystemI/O*/ blkcnt_t

st_blocks;

/*numberof512Bblocksallocated*/ time_t

st_atime;

/*timeoflastaccess*/ time_t

st_mtime;

/*timeoflastmodification*/ time_t

st_ctime;

/*timeoflaststatuschange*/};（2）structstat结构体2.函数stat()……ret=S_ISREG(buf.st_mode);

printf("ret=%d.\n",ret);ret=S_ISDIR(buf.st_mode);printf("ret=%d.\n",ret);.……示例2（2）structstat结构体-8-小结stat命令内部是使用了stat系统调用