diff mbox series

[uclibc-ng-devel] open: Add support for O_TMPFILE

Message ID 20210407170823.13254-1-nicolas.cavallari@green-communications.fr
State New
Headers show
Series [uclibc-ng-devel] open: Add support for O_TMPFILE | expand

Commit Message

Nicolas Cavallari April 7, 2021, 5:08 p.m. UTC
Since Linux 3.11, O_TMPFILE allows to create unnamed files that can be
linked later on.  It is internally defined as (O_TMPFILE | O_DIRECTORY)
to make it fail on old kernels.

Copying definitions from glibc for O_TMPFILE is not enough to support
O_TMPFILE; The open() wrapper also need to pass the mode when the flag
contains O_TMPFILE, otherwise, it will pass mode 000 which will succeed
but yield unexpected results.

openat() is curiously not affected since it passes the mode
unconditionally..

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
---
 include/fcntl.h                            | 5 +++--
 libc/sysdeps/linux/aarch64/bits/fcntl.h    | 1 +
 libc/sysdeps/linux/alpha/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/arc/bits/fcntl.h        | 1 +
 libc/sysdeps/linux/arm/bits/fcntl.h        | 1 +
 libc/sysdeps/linux/avr32/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/bfin/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/c6x/bits/fcntl.h        | 1 +
 libc/sysdeps/linux/common/open.c           | 2 +-
 libc/sysdeps/linux/common/open64.c         | 4 ++--
 libc/sysdeps/linux/cris/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/csky/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/frv/bits/fcntl.h        | 1 +
 libc/sysdeps/linux/h8300/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/hppa/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/i386/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/ia64/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/kvx/bits/fcntl.h        | 1 +
 libc/sysdeps/linux/lm32/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/m68k/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/metag/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/microblaze/bits/fcntl.h | 1 +
 libc/sysdeps/linux/mips/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/nds32/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/nios2/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/or1k/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/powerpc/bits/fcntl.h    | 1 +
 libc/sysdeps/linux/riscv64/bits/fcntl.h    | 1 +
 libc/sysdeps/linux/sh/bits/fcntl.h         | 1 +
 libc/sysdeps/linux/sparc/bits/fcntl.h      | 1 +
 libc/sysdeps/linux/sparc64/bits/fcntl.h    | 1 +
 libc/sysdeps/linux/tile/bits/fcntl.h       | 1 +
 libc/sysdeps/linux/x86_64/bits/fcntl.h     | 1 +
 libc/sysdeps/linux/xtensa/bits/fcntl.h     | 1 +
 34 files changed, 37 insertions(+), 5 deletions(-)

Comments

Waldemar Brodkorb April 9, 2021, 4 a.m. UTC | #1
Hi Nicolas,

thanks, applied and pushed,
 best regards
   Waldemar

Nicolas Cavallari wrote,

> Since Linux 3.11, O_TMPFILE allows to create unnamed files that can be
> linked later on.  It is internally defined as (O_TMPFILE | O_DIRECTORY)
> to make it fail on old kernels.
> 
> Copying definitions from glibc for O_TMPFILE is not enough to support
> O_TMPFILE; The open() wrapper also need to pass the mode when the flag
> contains O_TMPFILE, otherwise, it will pass mode 000 which will succeed
> but yield unexpected results.
> 
> openat() is curiously not affected since it passes the mode
> unconditionally..
> 
> Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
diff mbox series

Patch

diff --git a/include/fcntl.h b/include/fcntl.h
index 35797c689..136f64d70 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -104,8 +104,9 @@  libc_hidden_proto(fcntl64)
 #endif
 
 /* Open FILE and return a new file descriptor for it, or -1 on error.
-   OFLAG determines the type of access used.  If O_CREAT is on OFLAG,
-   the third argument is taken as a `mode_t', the mode of the created file.
+   OFLAG determines the type of access used.  If O_CREAT or O_TMPFILE
+   is on OFLAG, the third argument is taken as a `mode_t', the mode of
+   the created file.
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
diff --git a/libc/sysdeps/linux/aarch64/bits/fcntl.h b/libc/sysdeps/linux/aarch64/bits/fcntl.h
index 27922f602..c143ba9c9 100644
--- a/libc/sysdeps/linux/aarch64/bits/fcntl.h
+++ b/libc/sysdeps/linux/aarch64/bits/fcntl.h
@@ -52,6 +52,7 @@ 
 # define O_DIRECT	0200000
 # define O_NOATIME     01000000
 # define O_PATH       010000000
+# define O_TMPFILE    020040000
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/alpha/bits/fcntl.h b/libc/sysdeps/linux/alpha/bits/fcntl.h
index 24caaf6d4..11e68214e 100644
--- a/libc/sysdeps/linux/alpha/bits/fcntl.h
+++ b/libc/sysdeps/linux/alpha/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT      02000000 /* Direct disk access.  */
 # define O_NOATIME     04000000 /* Do not set atime.  */
 # define O_PATH       040000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE   0100100000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/arc/bits/fcntl.h b/libc/sysdeps/linux/arc/bits/fcntl.h
index af4c85af8..beb32e41e 100755
--- a/libc/sysdeps/linux/arc/bits/fcntl.h
+++ b/libc/sysdeps/linux/arc/bits/fcntl.h
@@ -41,6 +41,7 @@ 
 # define O_DIRECT	040000	/* Direct disk access.	*/
 # define O_NOATIME    01000000	/* Do not set atime.  */
 # define O_PATH	     010000000  /* Resolve pathname but do not open file.  */
+# define O_TMPFILE   020200000  /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/arm/bits/fcntl.h b/libc/sysdeps/linux/arm/bits/fcntl.h
index 036f4161c..823660648 100644
--- a/libc/sysdeps/linux/arm/bits/fcntl.h
+++ b/libc/sysdeps/linux/arm/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	0200000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020040000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/avr32/bits/fcntl.h b/libc/sysdeps/linux/avr32/bits/fcntl.h
index 6f1039a34..ec0a3b55d 100644
--- a/libc/sysdeps/linux/avr32/bits/fcntl.h
+++ b/libc/sysdeps/linux/avr32/bits/fcntl.h
@@ -35,6 +35,7 @@ 
 # define O_DIRECT	00040000	/* must be a directory */
 # define O_NOATIME	01000000	/* don't set atime */
 # define O_PATH        010000000	/* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020200000	/* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/bfin/bits/fcntl.h b/libc/sysdeps/linux/bfin/bits/fcntl.h
index c0d70875b..0909ae6c4 100644
--- a/libc/sysdeps/linux/bfin/bits/fcntl.h
+++ b/libc/sysdeps/linux/bfin/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	0200000	/* Direct disk access.	*/
 # define O_NOATIME	01000000	/* don't set atime */
 # define O_PATH        010000000	/* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020040000	/* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/c6x/bits/fcntl.h b/libc/sysdeps/linux/c6x/bits/fcntl.h
index 02c2ee131..14aea565e 100644
--- a/libc/sysdeps/linux/c6x/bits/fcntl.h
+++ b/libc/sysdeps/linux/c6x/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_LARGEFILE	0100000
 # define O_NOATIME      01000000
 # define O_PATH        010000000/* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020200000/* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/common/open.c b/libc/sysdeps/linux/common/open.c
index ccdcf3848..ac09d40f0 100644
--- a/libc/sysdeps/linux/common/open.c
+++ b/libc/sysdeps/linux/common/open.c
@@ -31,7 +31,7 @@  int open(const char *file, int oflag, ...)
 	int oldtype, result;
 #endif
 
-	if (oflag & O_CREAT) {
+	if (oflag & (O_CREAT | (O_TMPFILE &~ O_DIRECTORY))) {
 		va_list arg;
 		va_start(arg, oflag);
 		mode = va_arg(arg, mode_t);
diff --git a/libc/sysdeps/linux/common/open64.c b/libc/sysdeps/linux/common/open64.c
index 6e65a988e..9d4c06b18 100644
--- a/libc/sysdeps/linux/common/open64.c
+++ b/libc/sysdeps/linux/common/open64.c
@@ -10,13 +10,13 @@ 
 #include <stdarg.h>
 #include <cancel.h>
 
-/* Open FILE with access OFLAG.  If OFLAG includes O_CREAT,
+/* Open FILE with access OFLAG.  If OFLAG includes O_CREAT or O_TMPFILE,
    a third argument is the file protection.  */
 int open64(const char *file, int oflag, ...)
 {
 	mode_t mode = 0;
 
-	if (oflag & O_CREAT) {
+	if (oflag & (O_CREAT | (O_TMPFILE &~ O_DIRECTORY))) {
 		va_list arg;
 		va_start (arg, oflag);
 		mode = va_arg (arg, mode_t);
diff --git a/libc/sysdeps/linux/cris/bits/fcntl.h b/libc/sysdeps/linux/cris/bits/fcntl.h
index 01920fbc7..e9bc90ea9 100644
--- a/libc/sysdeps/linux/cris/bits/fcntl.h
+++ b/libc/sysdeps/linux/cris/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME	01000000 /* Do not set atime.  */
 # define O_PATH        010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/csky/bits/fcntl.h b/libc/sysdeps/linux/csky/bits/fcntl.h
index 817ef56e4..b36f41569 100644
--- a/libc/sysdeps/linux/csky/bits/fcntl.h
+++ b/libc/sysdeps/linux/csky/bits/fcntl.h
@@ -42,6 +42,7 @@ 
 # define O_DIRECT      00040000	/* direct disk access hint */
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/frv/bits/fcntl.h b/libc/sysdeps/linux/frv/bits/fcntl.h
index 91d72bc66..02c8ac310 100644
--- a/libc/sysdeps/linux/frv/bits/fcntl.h
+++ b/libc/sysdeps/linux/frv/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.  */
 # define O_NOATIME	01000000 /* don't set atime */
 # define O_PATH        010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/h8300/bits/fcntl.h b/libc/sysdeps/linux/h8300/bits/fcntl.h
index cd9280462..2062f7cda 100644
--- a/libc/sysdeps/linux/h8300/bits/fcntl.h
+++ b/libc/sysdeps/linux/h8300/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/hppa/bits/fcntl.h b/libc/sysdeps/linux/hppa/bits/fcntl.h
index a355737d0..4ce76ce5f 100644
--- a/libc/sysdeps/linux/hppa/bits/fcntl.h
+++ b/libc/sysdeps/linux/hppa/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	00040000 /* Direct disk access. */
 # define O_NOATIME	04000000 /* Do not set atime. */
 # define O_PATH		020000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     040010000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/i386/bits/fcntl.h b/libc/sysdeps/linux/i386/bits/fcntl.h
index 302aebcbc..f3c08bbe5 100644
--- a/libc/sysdeps/linux/i386/bits/fcntl.h
+++ b/libc/sysdeps/linux/i386/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/ia64/bits/fcntl.h b/libc/sysdeps/linux/ia64/bits/fcntl.h
index 08343c3cb..a20f44ff7 100644
--- a/libc/sysdeps/linux/ia64/bits/fcntl.h
+++ b/libc/sysdeps/linux/ia64/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	040000
 # define O_NOATIME	01000000 /* Do not set atime.  */
 # define O_PATH        010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020200000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/kvx/bits/fcntl.h b/libc/sysdeps/linux/kvx/bits/fcntl.h
index 14a75fe08..ea0c59d09 100644
--- a/libc/sysdeps/linux/kvx/bits/fcntl.h
+++ b/libc/sysdeps/linux/kvx/bits/fcntl.h
@@ -42,6 +42,7 @@ 
 # define O_DIRECT	040000	/* Direct disk access.	*/
 # define O_NOATIME    01000000	/* Do not set atime.  */
 # define O_PATH	     010000000  /* Resolve pathname but do not open file.  */
+# define O_TMPFILE   020200000  /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/lm32/bits/fcntl.h b/libc/sysdeps/linux/lm32/bits/fcntl.h
index 780c0c643..0bfea6e7a 100644
--- a/libc/sysdeps/linux/lm32/bits/fcntl.h
+++ b/libc/sysdeps/linux/lm32/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/m68k/bits/fcntl.h b/libc/sysdeps/linux/m68k/bits/fcntl.h
index 51589fffa..5a56c8781 100644
--- a/libc/sysdeps/linux/m68k/bits/fcntl.h
+++ b/libc/sysdeps/linux/m68k/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	0200000	/* Direct disk access.	*/
 # define O_NOATIME	01000000 /* Do not set atime.  */
 # define O_PATH        010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     020040000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/metag/bits/fcntl.h b/libc/sysdeps/linux/metag/bits/fcntl.h
index 98dc44085..bdd697348 100644
--- a/libc/sysdeps/linux/metag/bits/fcntl.h
+++ b/libc/sysdeps/linux/metag/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/microblaze/bits/fcntl.h b/libc/sysdeps/linux/microblaze/bits/fcntl.h
index 64942f5a5..110927d95 100644
--- a/libc/sysdeps/linux/microblaze/bits/fcntl.h
+++ b/libc/sysdeps/linux/microblaze/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/mips/bits/fcntl.h b/libc/sysdeps/linux/mips/bits/fcntl.h
index 0d7fb9a5a..33251c74d 100644
--- a/libc/sysdeps/linux/mips/bits/fcntl.h
+++ b/libc/sysdeps/linux/mips/bits/fcntl.h
@@ -55,6 +55,7 @@ 
 # define O_DIRECT	0x8000	/* Direct disk access hint.  */
 # define O_NOATIME	0x40000	/* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE     0x410000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has no synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/nds32/bits/fcntl.h b/libc/sysdeps/linux/nds32/bits/fcntl.h
index 988686b27..2e6a95ec8 100644
--- a/libc/sysdeps/linux/nds32/bits/fcntl.h
+++ b/libc/sysdeps/linux/nds32/bits/fcntl.h
@@ -58,6 +58,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/nios2/bits/fcntl.h b/libc/sysdeps/linux/nios2/bits/fcntl.h
index b70b718d2..200a35443 100644
--- a/libc/sysdeps/linux/nios2/bits/fcntl.h
+++ b/libc/sysdeps/linux/nios2/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/or1k/bits/fcntl.h b/libc/sysdeps/linux/or1k/bits/fcntl.h
index 1d9cc215e..c9599ef3a 100644
--- a/libc/sysdeps/linux/or1k/bits/fcntl.h
+++ b/libc/sysdeps/linux/or1k/bits/fcntl.h
@@ -53,6 +53,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/powerpc/bits/fcntl.h b/libc/sysdeps/linux/powerpc/bits/fcntl.h
index a76d84fb5..ef1beeca0 100644
--- a/libc/sysdeps/linux/powerpc/bits/fcntl.h
+++ b/libc/sysdeps/linux/powerpc/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	0400000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020040000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/riscv64/bits/fcntl.h b/libc/sysdeps/linux/riscv64/bits/fcntl.h
index a22287b32..a9d7c84e0 100644
--- a/libc/sysdeps/linux/riscv64/bits/fcntl.h
+++ b/libc/sysdeps/linux/riscv64/bits/fcntl.h
@@ -40,6 +40,7 @@ 
 # define O_DIRECT	00040000	/* Direct disk access.	*/
 # define O_NOATIME	01000000	/* Do not set atime.  */
 # define O_PATH		010000000  	/* Resolve pathname but do not open file.  */
+# define O_TMPFILE      020200000	/* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/sh/bits/fcntl.h b/libc/sysdeps/linux/sh/bits/fcntl.h
index 32c7d4b8f..0d687f04f 100644
--- a/libc/sysdeps/linux/sh/bits/fcntl.h
+++ b/libc/sysdeps/linux/sh/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/sparc/bits/fcntl.h b/libc/sysdeps/linux/sparc/bits/fcntl.h
index 336f5ca43..935495937 100644
--- a/libc/sysdeps/linux/sparc/bits/fcntl.h
+++ b/libc/sysdeps/linux/sparc/bits/fcntl.h
@@ -51,6 +51,7 @@ 
 # define O_DIRECT      0x100000 /* direct disk access hint */
 # define O_NOATIME     0x200000 /* Do not set atime.  */
 # define O_PATH       0x1000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    0x2010000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/sparc64/bits/fcntl.h b/libc/sysdeps/linux/sparc64/bits/fcntl.h
index b183f7b91..395c95baf 100644
--- a/libc/sysdeps/linux/sparc64/bits/fcntl.h
+++ b/libc/sysdeps/linux/sparc64/bits/fcntl.h
@@ -47,6 +47,7 @@ 
 # define O_NOATIME     0x200000 /* Do not set atime.  */
 # define O_CLOEXEC     0x400000 /* Set close_on_exit.  */
 # define O_PATH       0x1000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    0x2010000 /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/tile/bits/fcntl.h b/libc/sysdeps/linux/tile/bits/fcntl.h
index ca195b393..818da5c4a 100644
--- a/libc/sysdeps/linux/tile/bits/fcntl.h
+++ b/libc/sysdeps/linux/tile/bits/fcntl.h
@@ -40,6 +40,7 @@ 
 # define O_DIRECT	040000	/* Direct disk access.	*/
 # define O_NOATIME    01000000	/* Do not set atime.  */
 # define O_PATH	     010000000  /* Resolve pathname but do not open file.  */
+# define O_TMPFILE   020200000  /* Atomically create nameless file.  */
 #endif
 
 #ifdef __USE_LARGEFILE64
diff --git a/libc/sysdeps/linux/x86_64/bits/fcntl.h b/libc/sysdeps/linux/x86_64/bits/fcntl.h
index e4306aae1..3547a2046 100644
--- a/libc/sysdeps/linux/x86_64/bits/fcntl.h
+++ b/libc/sysdeps/linux/x86_64/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.
diff --git a/libc/sysdeps/linux/xtensa/bits/fcntl.h b/libc/sysdeps/linux/xtensa/bits/fcntl.h
index 757fd6b9c..5af9d2124 100644
--- a/libc/sysdeps/linux/xtensa/bits/fcntl.h
+++ b/libc/sysdeps/linux/xtensa/bits/fcntl.h
@@ -54,6 +54,7 @@ 
 # define O_DIRECT	 040000	/* Direct disk access.	*/
 # define O_NOATIME     01000000 /* Do not set atime.  */
 # define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+# define O_TMPFILE    020200000 /* Atomically create nameless file.  */
 #endif
 
 /* For now Linux has synchronisity options for data and read operations.