TRUNCATE(2)	    UNIX Programmer's Manual	      TRUNCATE(2)

     truncate - truncate a file to a specified length

     truncate(path, length)
     char *path;
     off_t length;

     ftruncate(fd, length)
     int fd;
     off_t length;

     Truncate causes the file named by path or referenced by fd
     to be truncated to at most length bytes in size.  If the
     file previously was larger than this size, the extra data is
     lost.  With ftruncate, the file must be open for writing.

     A value of 0 is returned if the call succeeds.  If the call
     fails a -1 is returned, and the global variable errno speci-
     fies the error.

     Truncate succeeds unless:

     [ENOTDIR]	    A component of the path prefix is not a

     [EINVAL]	    The pathname contains a character with the
		    high-order bit set.

     [ENAMETOOLONG] A component of a pathname exceeded 255 char-
		    acters, or an entire path name exceeded 1023

     [ENOENT]	    The named file does not exist.

     [EACCES]	    Search permission is denied for a component
		    of the path prefix.

     [EACCES]	    The named file is not writable by the user.

     [ELOOP]	    Too many symbolic links were encountered in
		    translating the pathname.

     [EISDIR]	    The named file is a directory.

     [EROFS]	    The named file resides on a read-only file

     [ETXTBSY]	    The file is a pure procedure (shared text)

Printed 11/26/99	 March 29, 1986                         1

TRUNCATE(2)	    UNIX Programmer's Manual	      TRUNCATE(2)

		    file that is being executed.

     [EIO]	    An I/O error occurred updating the inode.

     [EFAULT]	    Path points outside the process's allocated
		    address space.

     Ftruncate succeeds unless:

     [EBADF]	    The fd is not a valid descriptor.

     [EINVAL]	    The fd references a socket, not a file.

     [EINVAL]	    The fd is not open for writing.


     These calls should be generalized to allow ranges of bytes
     in a file to be discarded.

Printed 11/26/99	 March 29, 1986                         2

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