diff options
Diffstat (limited to 'winsup/cygwin/include/fcntl.h')
| -rw-r--r-- | winsup/cygwin/include/fcntl.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/winsup/cygwin/include/fcntl.h b/winsup/cygwin/include/fcntl.h index 9c3ddf926..fe8a1fc42 100644 --- a/winsup/cygwin/include/fcntl.h +++ b/winsup/cygwin/include/fcntl.h @@ -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 |