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From: Nate Karstens <nate.karstens@garmin.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Jeff Layton <jlayton@kernel.org>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Richard Henderson <rth@twiddle.net>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Matt Turner <mattst88@gmail.com>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	David Laight <David.Laight@aculab.com>,
	<linux-fsdevel@vger.kernel.org>, <linux-arch@vger.kernel.org>,
	<linux-alpha@vger.kernel.org>, <linux-parisc@vger.kernel.org>,
	<sparclinux@vger.kernel.org>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Cc: Changli Gao <xiaosuo@gmail.com>,
	Nate Karstens <nate.karstens@garmin.com>
Subject: [PATCH v2 3/4] fs: Add F_DUPFD_CLOFORK to fcntl(2)
Date: Fri, 15 May 2020 10:23:20 -0500	[thread overview]
Message-ID: <20200515152321.9280-4-nate.karstens@garmin.com> (raw)
In-Reply-To: <20200515152321.9280-1-nate.karstens@garmin.com>

Implement functionality for duplicating a file descriptor
and having the close-on-fork flag automatically set in the
new file descriptor.

Signed-off-by: Nate Karstens <nate.karstens@garmin.com>
---
 fs/fcntl.c                       | 4 ++++
 include/uapi/linux/fcntl.h       | 3 +++
 tools/include/uapi/linux/fcntl.h | 3 +++
 3 files changed, 10 insertions(+)

diff --git a/fs/fcntl.c b/fs/fcntl.c
index 40af2a48702b..e15cdd77b1df 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -333,6 +333,9 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
 	case F_DUPFD_CLOEXEC:
 		err = f_dupfd(arg, filp, O_CLOEXEC);
 		break;
+	case F_DUPFD_CLOFORK:
+		err = f_dupfd(arg, filp, O_CLOFORK);
+		break;
 	case F_GETFD:
 		err = f_getfd(fd);
 		break;
@@ -437,6 +440,7 @@ static int check_fcntl_cmd(unsigned cmd)
 	switch (cmd) {
 	case F_DUPFD:
 	case F_DUPFD_CLOEXEC:
+	case F_DUPFD_CLOFORK:
 	case F_GETFD:
 	case F_SETFD:
 	case F_GETFL:
diff --git a/include/uapi/linux/fcntl.h b/include/uapi/linux/fcntl.h
index ca88b7bce553..9e1069ff3a22 100644
--- a/include/uapi/linux/fcntl.h
+++ b/include/uapi/linux/fcntl.h
@@ -55,6 +55,9 @@
 #define F_GET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 13)
 #define F_SET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 14)
 
+/* Create a file descriptor with FD_CLOFORK set. */
+#define F_DUPFD_CLOFORK	(F_LINUX_SPECIFIC_BASE + 15)
+
 /*
  * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be
  * used to clear any hints previously set.
diff --git a/tools/include/uapi/linux/fcntl.h b/tools/include/uapi/linux/fcntl.h
index ca88b7bce553..9e1069ff3a22 100644
--- a/tools/include/uapi/linux/fcntl.h
+++ b/tools/include/uapi/linux/fcntl.h
@@ -55,6 +55,9 @@
 #define F_GET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 13)
 #define F_SET_FILE_RW_HINT	(F_LINUX_SPECIFIC_BASE + 14)
 
+/* Create a file descriptor with FD_CLOFORK set. */
+#define F_DUPFD_CLOFORK	(F_LINUX_SPECIFIC_BASE + 15)
+
 /*
  * Valid hint values for F_{GET,SET}_RW_HINT. 0 is "not set", or can be
  * used to clear any hints previously set.
-- 
2.26.1


  parent reply	other threads:[~2020-05-15 15:24 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-15 15:23 [PATCH v2] Implement close-on-fork Nate Karstens
2020-05-15 15:23 ` [PATCH v2 1/4] fs: " Nate Karstens
2020-05-15 15:23 ` [PATCH v2 2/4] fs: Add O_CLOFORK flag for open(2) and dup3(2) Nate Karstens
2020-05-15 15:23 ` Nate Karstens [this message]
2020-05-15 15:23 ` [PATCH v2 4/4] net: Add SOCK_CLOFORK Nate Karstens
2020-05-15 15:30 ` [PATCH v2] Implement close-on-fork Eric Dumazet
2020-05-15 15:59   ` David Laight
2020-05-15 15:57 ` Matthew Wilcox
2020-05-15 16:07   ` Karstens, Nate
2020-05-15 16:25     ` James Bottomley
2020-05-15 18:28       ` Karstens, Nate
2020-05-15 18:43         ` Matthew Wilcox
2020-05-25  8:16         ` Pavel Machek
2020-05-15 16:26     ` Matthew Wilcox
2020-05-16 13:29   ` Christian Brauner
2020-05-15 16:03 ` Al Viro
2020-05-15 16:26   ` Karstens, Nate
2020-05-15 16:53   ` David Howells
2022-06-18 11:41 ` Ralph Corderoy
2022-06-18 19:40   ` Matthew Wilcox
2022-06-19 10:42     ` Ralph Corderoy
2022-06-28 13:13       ` Christian Brauner
2022-06-28 13:38         ` David Laight
2022-06-28 13:43           ` Christian Brauner

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