IPnom Home • Manuals • FreeBSD

 FreeBSD Man Pages

Man Sections:Commands (1)System Calls (2)Library Functions (3)Device Drivers (4)File Formats (5)Miscellaneous (7)System Utilities (8)
Keyword Live Search (10 results max):
 Type in part of a command in the search box.
 
Index:
  a.out(5)
  acct(5)
  adduser.conf(5)
  aliases(5)
  amd.conf(5)
  auth.conf(5)
  big5(5)
  bluetooth.hosts(5)
  bluetooth.protocols(5)
  bootparams(5)
  bootptab(5)
  config(5)
  core(5)
  crontab(5)
  ctm(5)
  cvs(5)
  devd.conf(5)
  devfs(5)
  device.hints(5)
  dhclient.conf(5)
  dhclient.leases(5)
  dhcp-eval(5)
  dhcp-options(5)
  dir(5)
  dirent(5)
  disktab(5)
  editrc(5)
  elf(5)
  ethers(5)
  euc(5)
  eui64(5)
  exports(5)
  fbtab(5)
  fdescfs(5)
  finger.conf(5)
  forward(5)
  fs(5)
  fstab(5)
  ftpchroot(5)
  gb18030(5)
  gb2312(5)
  gbk(5)
  gettytab(5)
  groff_font(5)
  groff_out(5)
  groff_tmac(5)
  group(5)
  hcsecd.conf(5)
  hesiod.conf(5)
  hosts(5)
  hosts.equiv(5)
  hosts.lpd(5)
  hosts_access(5)
  hosts_options(5)
  inetd.conf(5)
  info(5)
  inode(5)
  intro(5)
  ipf(5)
  ipnat(5)
  ipnat.conf(5)
  ipsend(5)
  isdnd.acct(5)
  isdnd.rates(5)
  isdnd.rc(5)
  kbdmap(5)
  keycap(5)
  keymap(5)
  krb5.conf(5)
  lastlog(5)
  libarchive-formats(5)
  libmap.conf(5)
  link(5)
  linprocfs(5)
  loader.conf(5)
  login.access(5)
  login.conf(5)
  mac.conf(5)
  magic(5)
  mailer.conf(5)
  make.conf(5)
  malloc.conf(5)
  master.passwd(5)
  moduli(5)
  motd(5)
  msdos(5)
  msdosfs(5)
  mskanji(5)
  named.conf(5)
  netconfig(5)
  netgroup(5)
  netid(5)
  networks(5)
  newsyslog.conf(5)
  nologin(5)
  nsmb.conf(5)
  nsswitch.conf(5)
  ntp.conf(5)
  ntp.keys(5)
  opieaccess(5)
  opiekeys(5)
  passwd(5)
  pbm(5)
  pccard.conf(5)
  periodic.conf(5)
  pf.conf(5)
  pf.os(5)
  phones(5)
  printcap(5)
  procfs(5)
  protocols(5)
  publickey(5)
  pw.conf(5)
  quota.group(5)
  quota.user(5)
  radius.conf(5)
  rc.conf(5)
  rcsfile(5)
  remote(5)
  resolv.conf(5)
  resolver(5)
  rhosts(5)
  rndc.conf(5)
  rpc(5)
  rrenumd.conf(5)
  rtadvd.conf(5)
  services(5)
  shells(5)
  ssh_config(5)
  sshd_config(5)
  stab(5)
  style.Makefile(5)
  sysctl.conf(5)
  syslog.conf(5)
  tacplus.conf(5)
  tar(5)
  term(5)
  termcap(5)
  terminfo(5)
  texinfo(5)
  tmac(5)
  ttys(5)
  tzfile(5)
  usbd.conf(5)
  utf2(5)
  utf8(5)
  utmp(5)
  uuencode(5)
  uuencode.format(5)
  vgrindefs(5)
  wtmp(5)

dirent(5)

NAME

     dir, dirent -- directory file format


SYNOPSIS

     #include <dirent.h>


DESCRIPTION

     Directories provide a convenient hierarchical method of grouping files
     while obscuring the underlying details of the storage medium.  A direc-
     tory file is differentiated from a plain file by a flag in its inode(5)
     entry.  It consists of records (directory entries) each of which contains
     information about a file and a pointer to the file itself.  Directory
     entries may contain other directories as well as plain files; such nested
     directories are referred to as subdirectories.  A hierarchy of directo-
     ries and files is formed in this manner and is called a file system (or
     referred to as a file system tree).

     Each directory file contains two special directory entries; one is a
     pointer to the directory itself called dot `.' and the other a pointer to
     its parent directory called dot-dot `..'.	Dot and dot-dot are valid
     pathnames, however, the system root directory `/', has no parent and dot-
     dot points to itself like dot.

     File system nodes are ordinary directory files on which has been grafted
     a file system object, such as a physical disk or a partitioned area of
     such a disk.  (See mount(2) and mount(8).)

     The directory entry format is defined in the file <sys/dirent.h> (which
     should not be included directly by applications):

     #ifndef _SYS_DIRENT_H_
     #define _SYS_DIRENT_H_

     #include <machine/ansi.h>

     /*
      * The dirent structure defines the format of directory entries returned by
      * the getdirentries(2) system call.
      *
      * A directory entry has a struct dirent at the front of it, containing its
      * inode number, the length of the entry, and the length of the name
      * contained in the entry.  These are followed by the name padded to a 4
      * byte boundary with null bytes.	All names are guaranteed null terminated.
      * The maximum length of a name in a directory is MAXNAMLEN.
      */

     struct dirent {
	     __uint32_t d_fileno;	     /* file number of entry */
	     __uint16_t d_reclen;	     /* length of this record */
	     __uint8_t	d_type; 	     /* file type, see below */
	     __uint8_t	d_namlen;	     /* length of string in d_name */
     #ifdef _POSIX_SOURCE
	     char    d_name[255 + 1];	     /* name must be no longer than this */
     #else
     #define MAXNAMLEN	     255
	     char    d_name[MAXNAMLEN + 1];  /* name must be no longer than this */
     #endif
     #define DT_DIR	      4
     #define DT_BLK	      6
     #define DT_REG	      8
     #define DT_LNK	     10
     #define DT_SOCK	     12
     #define DT_WHT	     14

     /*
      * Convert between stat structure types and directory types.
      */
     #define IFTODT(mode)    (((mode) & 0170000) >> 12)
     #define DTTOIF(dirtype) ((dirtype) << 12)

     /*
      * The _GENERIC_DIRSIZ macro gives the minimum record length which will hold
      * the directory entry.  This requires the amount of space in struct direct
      * without the d_name field, plus enough space for the name with a terminating
      * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
      */
     #define _GENERIC_DIRSIZ(dp)     ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))

     #ifdef _KERNEL
     #define GENERIC_DIRSIZ(dp)      _GENERIC_DIRSIZ(dp)
     #endif

     #endif /* !_SYS_DIRENT_H_ */


SEE ALSO

     fs(5), inode(5)


BUGS

     The usage of the member d_type of struct dirent is unportable as it is
     FreeBSD-specific.	It also may fail on certain file systems, for example
     the cd9660 file system.


HISTORY

     A dir file format appeared in Version 7 AT&T UNIX.

FreeBSD 5.4			April 19, 1994			   FreeBSD 5.4

SPONSORED LINKS




Man(1) output converted with man2html , sed , awk