标签：c style class blog code java
1. 文件和元数据
/* obtaining the metadata of a file */ #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> int stat (const char *path, struct stat *buf); int fstat (int fd, struct stat *buf); int lstat (const char *path, struct stat *buf);
注意：lstat函数可以获取 符号链接的文件元数据，lstat() returns information about the link itself and not the target file
struct stat { dev_t st_dev; /* ID of device containing file */ ino_t st_ino; /* inode number */ mode_t st_mode; /* permissions */ nlink_t st_nlink; /* number of hard links */ uid_t st_uid; /* user ID of owner */ gid_t st_gid; /* group ID of owner */ dev_t st_rdev; /* device ID (if special file) */ off_t st_size; /* total size in bytes */ blksize_t st_blksize; /* blocksize for filesystem I/O */ blkcnt_t st_blocks; /* number of blocks allocated */ time_t st_atime; /* last access time */ time_t st_mtime; /* last modification time */ time_t st_ctime; /* last status change time */ };
/* creates a directory stream representing the directory given by name */ #include <sys/types.h> #include <dirent.h> DIR * opendir (const char *name);
/* returns the next entry in the directory represented by dir */ #include <sys/types.h> #include <dirent.h> struct dirent * readdir (DIR *dir);
/* closes the directory stream represented by dir */ #include <sys/types.h> #include <dirent.h> int closedir (DIR *dir);
/* * find_file_in_dir - searches the directory ‘path‘ for a * file named ‘file‘. * * Returns 0 if ‘file‘ exists in ‘path‘ and a nonzero * value otherwise. */ int find_file_in_dir (const char *path, const char *file) { struct dirent *entry; int ret = 1; DIR *dir; dir = opendir (path); errno = 0; while ((entry = readdir (dir)) != NULL) { if (strcmp(entry->d_name, file) == 0) { ret = 0; break; } } if (errno && !entry) perror ("readdir"); closedir (dir); return ret; }
/* creates a new link under the path newpath for the existing file oldpath */ #include <unistd.h> int link (const char *oldpath, const char *newpath);
/* creates the symbolic link newpath pointing at the target oldpath */ #include <unistd.h> int symlink (const char *oldpath, const char *newpath);
解链：
#include <unistd.h> int unlink (const char *pathname);
1). Open src. 2). Open dst, creating it if it does not exist, and truncating it to zero length if it does exist. 3). Read a chunk of src into memory. 4). Write the chunk to dst. 5). Continue until all of src has been read and written to dst. 6). Close dst. 7). Close src.
Linux System Programming 学习笔记(八) 文件和目录管理,布布扣,bubuko.com
Linux System Programming 学习笔记(八) 文件和目录管理
标签：c style class blog code java
原文地址：http://www.cnblogs.com/wwwjieo0/p/3756033.html
