Unix/Linux Go Back    

FreeBSD 11.0 - man page for getdirentries (freebsd section 2)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

GETDIRENTRIES(2) 		     BSD System Calls Manual			   GETDIRENTRIES(2) 

     getdirentries, getdents -- get directory entries in a file system independent format

     Standard C Library (libc, -lc)

     #include <sys/types.h>
     #include <dirent.h>

     getdirentries(int fd, char *buf, int nbytes, long *basep);

     getdents(int fd, char *buf, int nbytes);

     The getdirentries() and getdents() system calls read directory entries from the directory
     referenced by the file descriptor fd into the buffer pointed to by buf, in a file system
     independent format.  Up to nbytes of data will be transferred.  The nbytes argument must be
     greater than or equal to the block size associated with the file, see   stat(2) .  Some file
     systems may not support these system calls with buffers smaller than this size.

     The data in the buffer is a series of dirent structures each containing the following

	   uint32_t d_fileno;
	   uint16_t d_reclen;
	   uint8_t  d_type;
	   uint8_t  d_namlen;
	   char    d_name[MAXNAMELEN + 1]; /* see below */

     The d_fileno entry is a number which is unique for each distinct file in the file system.
     Files that are linked by hard links (see   link(2) ) have the same d_fileno.	The d_reclen
     entry is the length, in bytes, of the directory record.  The d_type entry is the type of the
     file pointed to by the directory record.  The file type values are defined in
     <sys/dirent.h>.  The d_name entry contains a null terminated file name.  The d_namlen entry
     specifies the length of the file name excluding the null byte.  Thus the actual size of
     d_name may vary from 1 to MAXNAMELEN + 1.

     Entries may be separated by extra space.  The d_reclen entry may be used as an offset from
     the start of a dirent structure to the next structure, if any.

     The actual number of bytes transferred is returned.  The current position pointer associated
     with fd is set to point to the next block of entries.  The pointer may not advance by the
     number of bytes returned by getdirentries() or getdents().  A value of zero is returned when
     the end of the directory has been reached.

     The getdirentries() system call writes the position of the block read into the location
     pointed to by basep.  Alternatively, the current position pointer may be set and retrieved
     by   lseek(2) .  The current position pointer should only be set to a value returned by
       lseek(2) , a value returned in the location pointed to by basep (getdirentries() only) or

     If successful, the number of bytes actually transferred is returned.  Otherwise, -1 is
     returned and the global variable errno is set to indicate the error.

     The getdirentries() system call will fail if:

     [EBADF]		The fd argument is not a valid file descriptor open for reading.

     [EFAULT]		Either buf or basep point outside the allocated address space.

     [EINVAL]		The file referenced by fd is not a directory, or nbytes is too small for
			returning a directory entry or block of entries, or the current position
			pointer is invalid.

     [EIO]		An I/O error occurred while reading from or writing to the file system.

       lseek(2) ,   open(2) 

     The getdirentries() system call first appeared in 4.4BSD.	The getdents() system call first
     appeared in FreeBSD 3.0.

BSD					   May 3, 1995					      BSD
Unix & Linux Commands & Man Pages : ©2000 - 2017 Unix and Linux Forums

All times are GMT -4. The time now is 12:00 PM.