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Date: Tue, 6 May 2008 17:18:07 -0400
From: Ulrich Drepper <drepper@...hat.com>
To: linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: akpm@...ux-foundation.org, davidel@...ilserver.org,
mtk.manpages@...il.com, torvalds@...ux-foundation.org
Subject: [PATCH 10/18] flag parameters: inotify_init
This patch introduces the new syscall inotify_init1 (note: the 1 stands
for the one parameter the syscall takes, as opposed to no parameter before).
The values excepted for this parameter are function-specific and defined
in the inotify.h header. Here the values must match the O_* flags, though.
In this patch CLOEXEC support is introduced.
The following test must be adjusted for architectures other than x86 and
x86-64 and in case the syscall numbers changed.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/syscall.h>
#ifndef __NR_inotify_init1
# ifdef __x86_64__
# define __NR_inotify_init1 294
# elif defined __i386__
# define __NR_inotify_init1 332
# else
# error "need __NR_inotify_init1"
# endif
#endif
#define IN_CLOEXEC O_CLOEXEC
int
main (void)
{
int fd;
fd = syscall (__NR_inotify_init1, 0);
if (fd == -1)
{
puts ("inotify_init1(0) failed");
return 1;
}
int coe = fcntl (fd, F_GETFD);
if (coe == -1)
{
puts ("fcntl failed");
return 1;
}
if (coe & FD_CLOEXEC)
{
puts ("inotify_init1(0) set close-on-exit");
return 1;
}
close (fd);
fd = syscall (__NR_inotify_init1, IN_CLOEXEC);
if (fd == -1)
{
puts ("inotify_init1(IN_CLOEXEC) failed");
return 1;
}
coe = fcntl (fd, F_GETFD);
if (coe == -1)
{
puts ("fcntl failed");
return 1;
}
if ((coe & FD_CLOEXEC) == 0)
{
puts ("inotify_init1(O_CLOEXEC) does not set close-on-exit");
return 1;
}
close (fd);
puts ("OK");
return 0;
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/x86/ia32/ia32entry.S | 1 +
arch/x86/kernel/syscall_table_32.S | 1 +
fs/inotify_user.c | 12 ++++++++++--
include/asm-x86/unistd_32.h | 1 +
include/asm-x86/unistd_64.h | 2 ++
include/linux/inotify.h | 5 +++++
include/linux/syscalls.h | 1 +
7 files changed, 21 insertions(+), 2 deletions(-)
Signed-off-by: Ulrich Drepper <drepper@...hat.com>
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index 34071a2..37e4992 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -736,4 +736,5 @@ ia32_sys_call_table:
.quad sys_epoll_create2
.quad sys_dup3 /* 330 */
.quad sys_pipe2
+ .quad sys_inotify_init1
ia32_syscall_end:
diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index 6615476..f59aba5 100644
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -331,3 +331,4 @@ ENTRY(sys_call_table)
.long sys_epoll_create2
.long sys_dup3 /* 330 */
.long sys_pipe2
+ .long sys_inotify_init1
diff --git a/fs/inotify_user.c b/fs/inotify_user.c
index 6676c06..93ab4a6 100644
--- a/fs/inotify_user.c
+++ b/fs/inotify_user.c
@@ -566,7 +566,7 @@ static const struct inotify_operations inotify_user_ops = {
.destroy_watch = free_inotify_user_watch,
};
-asmlinkage long sys_inotify_init(void)
+asmlinkage long sys_inotify_init1(int flags)
{
struct inotify_device *dev;
struct inotify_handle *ih;
@@ -574,7 +574,10 @@ asmlinkage long sys_inotify_init(void)
struct file *filp;
int fd, ret;
- fd = get_unused_fd();
+ if (flags & ~IN_CLOEXEC)
+ return -EINVAL;
+
+ fd = get_unused_fd_flags(flags & O_CLOEXEC);
if (fd < 0)
return fd;
@@ -638,6 +641,11 @@ out_put_fd:
return ret;
}
+asmlinkage long sys_inotify_init(void)
+{
+ return sys_inotify_init1(0);
+}
+
asmlinkage long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
{
struct inode *inode;
diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h
index 748a05c..b3daf50 100644
--- a/include/asm-x86/unistd_32.h
+++ b/include/asm-x86/unistd_32.h
@@ -337,6 +337,7 @@
#define __NR_epoll_create2 329
#define __NR_dup3 330
#define __NR_pipe2 331
+#define __NR_inotify_init1 332
#ifdef __KERNEL__
diff --git a/include/asm-x86/unistd_64.h b/include/asm-x86/unistd_64.h
index 6aa423d..5ef6778 100644
--- a/include/asm-x86/unistd_64.h
+++ b/include/asm-x86/unistd_64.h
@@ -651,6 +651,8 @@ __SYSCALL(__NR_epoll_create2, sys_epoll_create2)
__SYSCALL(__NR_dup3, sys_dup3)
#define __NR_pipe2 293
__SYSCALL(__NR_pipe2, sys_pipe2)
+#define __NR_inotify_init1 294
+__SYSCALL(__NR_inotify_init1, sys_inotify_init1)
#ifndef __NO_STUBS
diff --git a/include/linux/inotify.h b/include/linux/inotify.h
index 742b917..72ef821 100644
--- a/include/linux/inotify.h
+++ b/include/linux/inotify.h
@@ -7,6 +7,8 @@
#ifndef _LINUX_INOTIFY_H
#define _LINUX_INOTIFY_H
+/* For O_CLOEXEC */
+#include <linux/fcntl.h>
#include <linux/types.h>
/*
@@ -63,6 +65,9 @@ struct inotify_event {
IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
IN_MOVE_SELF)
+/* Flags for sys_inotify_init1. */
+#define IN_CLOEXEC O_CLOEXEC
+
#ifdef __KERNEL__
#include <linux/dcache.h>
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 143d5ee..aeb2df8 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -547,6 +547,7 @@ asmlinkage long sys_get_mempolicy(int __user *policy,
unsigned long addr, unsigned long flags);
asmlinkage long sys_inotify_init(void);
+asmlinkage long sys_inotify_init1(int flags);
asmlinkage long sys_inotify_add_watch(int fd, const char __user *path,
u32 mask);
asmlinkage long sys_inotify_rm_watch(int fd, u32 wd);
--
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