* Implemented flock() semantics to the advisory locking backend. Not tested

(must also compare to BSD; I've looked at their sources, but I might have
  missed something).
* Added sys/file.h and the flock() system call.
* common_fcntl() could forget to put back the file descriptor on some error
  conditions (I guess we should introduce and use a DescriptorGetter class).
* Cleaned up fcntl.h, moved the BSD extensions S_IREAD and S_IWRITE to
  sys/stat.h where they belong, and added the missing S_IEXEC to them.
* Added some more comments.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23836 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/fcntl.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2007, Haiku Inc. All Rights Reserved.
+ * Copyright 2002-2008, Haiku Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _FCNTL_H
@@ -74,15 +74,6 @@ struct flock {
 	pid_t	l_pid;
 };
 
-/* for use with flock() - TODO: this should be moved to sys/file.h *if* we'll support flock() one day */
-#define	LOCK_SH		0x01	/* shared file lock */
-#define	LOCK_EX		0x02	/* exclusive file lock */
-#define	LOCK_NB		0x04	/* don't block when locking */
-#define	LOCK_UN		0x08	/* unlock file */
-
-#define S_IREAD		0x0100  /* owner may read */
-#define S_IWRITE	0x0080	/* owner may write */
-
 
 #ifdef __cplusplus
 extern "C" {
@@ -99,4 +90,4 @@ extern int	fcntl(int fd, int op, ...);
 }
 #endif
 
-#endif /* _FCNTL_H */
+#endif	/* _FCNTL_H */

headers/posix/sys/file.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2008, Haiku Inc. All Rights Reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _SYS_FILE_H
+#define _SYS_FILE_H
+
+
+#include <sys/types.h>
+
+
+/* for use with flock() */
+#define	LOCK_SH		0x01	/* shared file lock */
+#define	LOCK_EX		0x02	/* exclusive file lock */
+#define	LOCK_NB		0x04	/* don't block when locking */
+#define	LOCK_UN		0x08	/* unlock file */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int	flock(int fd, int op);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _SYS_FILE_H */

headers/posix/sys/stat.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2006, Haiku Inc. All Rights Reserved.
+ * Copyright 2002-2008, Haiku Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _SYS_STAT_H_
@@ -85,6 +85,11 @@ struct stat {
 #define S_IWOTH 00002       /* write permission: other */
 #define S_IXOTH 00001       /* execute permission: other */
 
+/* BSD extensions */
+#define S_IREAD		S_IRUSR
+#define S_IWRITE	S_IWUSR
+#define S_IEXEC		S_IXUSR
+
 #define ACCESSPERMS (S_IRWXU | S_IRWXG | S_IRWXO)
 #define ALLPERMS    (S_ISUID | S_ISGID | S_ISTXT | S_IRWXU | S_IRWXG | S_IRWXO)
 #define	DEFFILEMODE	(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)

headers/private/kernel/syscalls.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2004-2007, Haiku Inc. All rights reserved.
+ * Copyright 2004-2008, Haiku Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _KERNEL_SYSCALLS_H
@@ -151,6 +151,7 @@ extern int			_kern_open_parent_dir(int fd, char *name,
 						size_t nameLength);
 extern status_t		_kern_fcntl(int fd, int op, uint32 argument);
 extern status_t		_kern_fsync(int fd);
+extern status_t		_kern_flock(int fd, int op);
 extern off_t		_kern_seek(int fd, off_t pos, int seekType);
 extern status_t		_kern_create_dir_entry_ref(dev_t device, ino_t inode, const char *name, int perms);
 extern status_t		_kern_create_dir(int fd, const char *path, int perms);

headers/private/kernel/vfs.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2007, Axel Dörfler, [email protected]. All rights reserved.
+ * Copyright 2002-2008, Axel Dörfler, [email protected]. All rights reserved.
  * Distributed under the terms of the MIT License.
  *
  * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
@@ -145,6 +145,7 @@ int _user_open_dir(int fd, const char *path);
 int _user_open_parent_dir(int fd, char *name, size_t nameLength);
 status_t _user_fcntl(int fd, int op, uint32 argument);
 status_t _user_fsync(int fd);
+status_t _user_flock(int fd, int op);
 status_t _user_read_stat(int fd, const char *path, bool traverseLink,
 			struct stat *stat, size_t statSize);
 status_t _user_write_stat(int fd, const char *path, bool traverseLink,