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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 17:49:11.000000000 -0400
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+++ b/sysdeps/unix/sysv/linux/bits/fcntl-linux.h	2018-04-13 17:58:48.234289426 -0400
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@@ -131,6 +131,7 @@
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 # define O_DIRECT	__O_DIRECT	/* Direct disk access.	*/
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 # define O_NOATIME	__O_NOATIME	/* Do not set atime.  */
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 # define O_PATH		__O_PATH	/* Resolve pathname but do not open file.  */
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+# define O_TMPFILE	__O_TMPFILE	/* Atomically create nameless file.  */
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 #endif
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 /* For now, Linux has no separate synchronicitiy options for read
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Only in b/sysdeps/unix/sysv/linux/bits: fcntl-linux.h~