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commit 0961f7e1e300ef633b0c1ad95d0999fb5c169f4e
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Author: Jeff Layton <jlayton@poochiereds.net>
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Date: Wed Jul 23 14:21:05 2014 -0400
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fcntl-linux.h: add new definitions and manual updates for open file description locks
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Open file description locks have been merged into the Linux kernel for
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v3.15. Add the appropriate command-value definitions and an update to
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the manual that describes their usage.
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Note by DJ: the implementation doesn't work correctly for 32-bit file
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offsets. Upstream changed the ABI to compensate but RHEL can't, so we
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enable these only for when file offsets are 64 bits.
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diff -rup a/sysdeps/unix/sysv/linux/bits/fcntl-linux.h b/sysdeps/unix/sysv/linux/bits/fcntl-linux.h
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--- a/sysdeps/unix/sysv/linux/bits/fcntl-linux.h 2018-04-13 18:38:24.000000000 -0400
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+++ b/sysdeps/unix/sysv/linux/bits/fcntl-linux.h 2018-04-13 20:05:21.743234360 -0400
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@@ -117,6 +117,25 @@
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# define F_SETLKW64 14 /* Set record locking info (blocking). */
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#endif
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+#ifdef __USE_FILE_OFFSET64
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+/* open file description locks.
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+
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+ Usually record locks held by a process are released on *any* close and are
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+ not inherited across a fork.
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+
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+ These cmd values will set locks that conflict with process-associated record
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+ locks, but are "owned" by the opened file description, not the process.
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+ This means that they are inherited across fork or clone with CLONE_FILES
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+ like BSD (flock) locks, and they are only released automatically when the
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+ last reference to the the file description against which they were acquired
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+ is put. */
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+#ifdef __USE_GNU
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+# define F_OFD_GETLK 36
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+# define F_OFD_SETLK 37
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+# define F_OFD_SETLKW 38
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+#endif
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+#endif
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+
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#ifdef __USE_LARGEFILE64
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# define O_LARGEFILE __O_LARGEFILE
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#endif
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