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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>, <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 3/4] fs: Add F_DUPFD_CLOFORK to fcntl(2)
Date: Mon, 20 Apr 2020 02:15:47 -0500
Message-ID: <20200420071548.62112-4-nate.karstens@garmin.com> (raw)
In-Reply-To: <20200420071548.62112-1-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 b59b27c3a338..43ca3e3dacc5 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 = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
 		err |= get_close_on_fork(fd) ? FD_CLOFORK : 0;
@@ -439,6 +442,7 @@ 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 index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20  7:15 Implement close-on-fork Nate Karstens
2020-04-20  7:15 ` [PATCH 1/4] fs: " Nate Karstens
2020-04-20 10:25   ` Eric Dumazet
2020-04-22  3:38     ` Changli Gao
2020-04-22  3:41       ` Changli Gao
2020-04-22  8:35     ` David Laight
2020-05-01 14:45     ` Karstens, Nate
2020-05-01 15:23       ` Matthew Wilcox
2020-05-03 13:52       ` David Laight
2020-04-22 15:36   ` Karstens, Nate
2020-04-22 15:43     ` Matthew Wilcox
2020-04-22 16:02       ` Karstens, Nate
2020-04-22 16:31         ` Bernd Petrovitsch
2020-04-22 16:55           ` David Laight
2020-04-23 12:34             ` Bernd Petrovitsch
2020-04-20  7:15 ` [PATCH 2/4] fs: Add O_CLOFORK flag for open(2) and dup3(2) Nate Karstens
2020-04-20  7:15 ` Nate Karstens [this message]
2020-04-20  7:15 ` [PATCH 4/4] net: Add SOCK_CLOFORK Nate Karstens
2020-04-22 14:32 ` Implement close-on-fork James Bottomley
2020-04-22 15:01 ` Al Viro
2020-04-22 15:18   ` Matthew Wilcox
2020-04-22 15:34     ` James Bottomley
2020-04-22 16:00     ` Al Viro
2020-04-22 16:13       ` Al Viro
2020-05-04 13:46       ` Karstens, Nate

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