linux-kernel - [PATCH v2 1/2] vfs: Define new syscall getumask.

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Date:	Wed, 13 Apr 2016 13:57:51 +0100
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	akpm@...ux-foundation.org, luto@...nel.org,
	viro@...iv.linux.org.uk, mathieu.desnoyers@...icios.com,
	zab@...hat.com, emunson@...mai.com, paulmck@...ux.vnet.ibm.com,
	aarcange@...hat.com, josh@...htriplett.org, xemul@...allels.com,
	sfr@...b.auug.org.au, milosz@...in.com, rostedt@...dmis.org,
	arnd@...db.de, ebiederm@...ssion.com, gorcunov@...nvz.org,
	iulia.manda21@...il.com, dave.hansen@...ux.intel.com,
	mguzik@...hat.com, adobriyan@...il.com, dave@...olabs.net,
	linux-api@...r.kernel.org, gorcunov@...il.com, fw@...eb.enyo.de
Subject: [PATCH v2 1/2] vfs: Define new syscall getumask.

Define a system call for reading the current umask value.

Signed-off-by: Richard W.M. Jones <rjones@...hat.com>
---
 include/linux/syscalls.h | 1 +
 kernel/sys.c             | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index d795472..e96e88f 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -659,6 +659,7 @@ asmlinkage long sys_prlimit64(pid_t pid, unsigned int resource,
 				struct rlimit64 __user *old_rlim);
 asmlinkage long sys_getrusage(int who, struct rusage __user *ru);
 asmlinkage long sys_umask(int mask);
+asmlinkage long sys_getumask(void);
 
 asmlinkage long sys_msgget(key_t key, int msgflg);
 asmlinkage long sys_msgsnd(int msqid, struct msgbuf __user *msgp,
diff --git a/kernel/sys.c b/kernel/sys.c
index cf8ba54..9db526c 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1649,6 +1649,11 @@ SYSCALL_DEFINE1(umask, int, mask)
 	return mask;
 }
 
+SYSCALL_DEFINE0(getumask)
+{
+	return current_umask();
+}
+
 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 {
 	struct fd exe;
-- 
2.7.4