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STAT(2) System Calls Manual STAT(2) NAME stat, lstat, fstat - get file status SYNOPSIS #include <sys/types.h> #include <sys/stat.h> int stat(name, buf) char *name; struct stat *buf; int lstat(name, buf) char *name; struct stat *buf; int fstat(fildes, buf) struct stat *buf; DESCRIPTION Stat puts detailed information about the file name in a structure whose address is buf. Lstat does the same except that when name is a sym- bolic link (see link(2)), it supplies information about the link it- self. Fstat does what stat does for the file open on descriptor fildes. It is unnecessary to have any permissions at all with respect to name, but all directories leading to the file must be searchable. struct stat { dev_t st_dev; device number for this file system ino_t st_ino; inode number unsigned short st_mode; file mode encoded as below short st_nlink; number of links (not symbolic links) short st_uid; uid of owner short st_gid; gid of owner dev_t st_rdev; if device file, the device number off_t st_size; size in bytes time_t st_atime; time file was last read or created time_t st_mtime; time file was last written or created time_t st_ctime; time file or inode was last written or created }; The bits in st_mode are defined by S_IFMT 0170000 file type S_IFDIR 0040000 directory S_IFCHR 0020000 character device S_IFBLK 0060000 block device S_IFREG 0100000 regular file S_IFLNK 0120000 symbolic link S_ISUID 0004000 set userid on execution S_ISGID 0002000 set groupid on execution S_ICCTYP 0007000 type of concurrency control S_ISYNC 0001000 1 writer and n readers (synchronized access) S_IEXCL 0003000 1 writer or n readers (exclusive access) 0000400 read permission by owner 0000200 write permission by owner 0000100 execute permission (search on directory) by owner 0000070 read, write, execute (search) by group 0000007 read, write, execute (search) by others S_IFMT and S_ICCTYP are field masks; the other constants encode modes. Codes contained in the S_IFMT field are mutually exclusive. If bit is set, the concurrency modes contained in S_ICCTYP are in effect; other- wise the set-id flags S_ISUID and S_ISGID apply. The concurrency modes affect open and creat calls. Synchronized ac- cess, S_ISYNC, guards against inconsistent updates by forbidding con- current opens for writing. Exclusive access, S_IEXCL, guards against inconsistent views by forbidding concurrent opens if one is for writ- ing. SEE ALSO chmod(1), ls(1), chmod(2), filsys(5) DIAGNOSTICS stat, lstat: EACCES, EFAULT, EIO, ELOOP, ENOENT, ENOTDIR fstat: EBADF, EFAULT, EIO BUGS For efficiency, st_atime is not set when a directory is searched, al- though this might be more logical. STAT(2)