/[emacs]/emacs/lispref/files.texi
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revision 1.72 by teirllm, Wed Sep 8 02:55:36 2004 UTC revision 1.73 by rms, Thu Feb 3 07:01:04 2005 UTC
# Line 646  with-temp-buffer,, The Current Buffer}. Line 646  with-temp-buffer,, The Current Buffer}.
646  @section File Locks  @section File Locks
647  @cindex file locks  @cindex file locks
648    
649    When two users edit the same file at the same time, they are likely to    When two users edit the same file at the same time, they are likely
650  interfere with each other.  Emacs tries to prevent this situation from  to interfere with each other.  Emacs tries to prevent this situation
651  arising by recording a @dfn{file lock} when a file is being modified.  from arising by recording a @dfn{file lock} when a file is being
652    modified.  (File locks are not implemented on Microsoft systems.)
653  Emacs can then detect the first attempt to modify a buffer visiting a  Emacs can then detect the first attempt to modify a buffer visiting a
654  file that is locked by another Emacs job, and ask the user what to do.  file that is locked by another Emacs job, and ask the user what to do.
655  The file lock is really a file, a symbolic link with a special name,  The file lock is really a file, a symbolic link with a special name,
# Line 680  some other job. Line 681  some other job.
681  This function locks the file @var{filename}, if the current buffer is  This function locks the file @var{filename}, if the current buffer is
682  modified.  The argument @var{filename} defaults to the current buffer's  modified.  The argument @var{filename} defaults to the current buffer's
683  visited file.  Nothing is done if the current buffer is not visiting a  visited file.  Nothing is done if the current buffer is not visiting a
684  file, or is not modified.  file, or is not modified, or if the system does not support locking.
685  @end defun  @end defun
686    
687  @defun unlock-buffer  @defun unlock-buffer
688  This function unlocks the file being visited in the current buffer,  This function unlocks the file being visited in the current buffer,
689  if the buffer is modified.  If the buffer is not modified, then  if the buffer is modified.  If the buffer is not modified, then
690  the file should not be locked, so this function does nothing.  It also  the file should not be locked, so this function does nothing.  It also
691  does nothing if the current buffer is not visiting a file.  does nothing if the current buffer is not visiting a file, or if the
692    system does not support locking.
693  @end defun  @end defun
694    
695    File locking is not supported on some systems.  On systems that do not    File locking is not supported on some systems.  On systems that do not
# Line 834  a directory. Line 836  a directory.
836  @c Emacs 19 feature  @c Emacs 19 feature
837  @defun file-accessible-directory-p dirname  @defun file-accessible-directory-p dirname
838  This function returns @code{t} if you have permission to open existing  This function returns @code{t} if you have permission to open existing
839  files in the directory whose name as a file is @var{dirname}; otherwise  files in the directory whose name as a file is @var{dirname};
840  (or if there is no such directory), it returns @code{nil}.  The value  otherwise (or if there is no such directory), it returns @code{nil}.
841  of @var{dirname} may be either a directory name or the file name of a  The value of @var{dirname} may be either a directory name (such as
842  file which is a directory.  @file{/foo/}) or the file name of a file which is a directory
843    (such as @file{/foo}, without the final slash).
844    
845  Example: after the following,  Example: after the following,
846    

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