* autoload.cc (CancelSynchronousIo): Define.
* fcntl.cc (fcntl64): Drop handling of locking commands. * fhandler.h (class fhandler_disk_file): Add mandatory_locking. (fhandler_disk_file::fcntl): Declare. (fhandler_disk_file::mand_lock): Declare. * fhandler_disk_file.cc (fhandler_disk_file::fhandler_disk_file): Initialize mandatory_locking. (fhandler_disk_file::fcntl): New method. Handle F_LCK_MANDATORY and locking commands. (fhandler_disk_file::dup): Duplicate mandatory_locking. Fix a bug when duplicating prw_handle failed. (fhandler_disk_file::fixup_after_fork): Reset mandatory_locking. * flock.cc (fhandler_disk_file::lock): Add comment. (struct lock_parms): New struct to pass parameters to blocking_lock_thr thread function. (blocking_lock_thr): New thread function. (fhandler_disk_file::mand_lock): New methof implementing mandatory locking with Windows semantics. * ntdll.h (NtLockFile): Declare. (NtUnlockFile): Declare. * include/fcntl.h: Fix a comment. (F_LCK_MANDATORY): Define. Add lengthy comment to explain.
This commit is contained in:
@ -1,6 +1,6 @@
|
||||
/* fcntl.h
|
||||
|
||||
Copyright 1996, 1998, 2000, 2001, 2005, 2006, 2009, 2010 Red Hat, Inc.
|
||||
Copyright 1996, 1998, 2000, 2001, 2005, 2006, 2009, 2010, 2013 Red Hat, Inc.
|
||||
|
||||
This file is part of Cygwin.
|
||||
|
||||
@ -14,12 +14,29 @@ details. */
|
||||
#include <sys/fcntl.h>
|
||||
#define O_NDELAY _FNDELAY
|
||||
|
||||
/* sys/fcntl defines values up to 0x40000 (O_NOINHERIT). */
|
||||
/* sys/_default_fcntl.h defines values up to 0x40000 (O_NOINHERIT). */
|
||||
#define _FDIRECT 0x80000
|
||||
#define _FNOFOLLOW 0x100000
|
||||
#define _FDIRECTORY 0x200000
|
||||
#define _FEXECSRCH 0x400000
|
||||
|
||||
/* F_LCK_MANDATORY: Request mandatory locks for this file descriptor.
|
||||
|
||||
Cygwin extension to fcntl file locking mechanism. By default, fcntl file
|
||||
locks are advisory locks. This works nicely as long as only Cygwin
|
||||
processes interact. If you have the requirement to interact with native
|
||||
Windows applications which use Windows mandatory file locking, your have
|
||||
to use mandatory locking as well. The command
|
||||
|
||||
fcntl (fd, F_LCK_MANDATORY, 1)
|
||||
|
||||
switches subsequent F_GETLK, F_SETLK, F_SETLKW calls to mandatory locking
|
||||
for this file descriptor and subsequently duplicated ones WITHIN THE SAME
|
||||
PROCESS. Note that mandatory locks are NOT inherited by child processes,
|
||||
nor do they survive an execve call. This fully corresponds to Windows
|
||||
mandatory locking semantics. */
|
||||
#define F_LCK_MANDATORY 0x99
|
||||
|
||||
/* POSIX-1.2008 requires this flag and allows to set it to 0 if its
|
||||
functionality is not required. */
|
||||
#define O_TTY_INIT 0
|
||||
|
Reference in New Issue
Block a user