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
next prev 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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