[PATCH] open.2: No need for /proc to make an O_TMPFILE file permanent

[Adam Borowski <kilobyte@xxxxxxxxxx>]

In the example snippet, we already have the fd, thus there's no
need to refer to the file by name.  And, /proc/ might be not mounted
or not accessible.

Noticed-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Adam Borowski <kilobyte@xxxxxxxxxx>
---
 man2/open.2 | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/man2/open.2 b/man2/open.2
index 5d0ce66d8..1c775b6b3 100644
--- a/man2/open.2
+++ b/man2/open.2
@@ -811,9 +811,7 @@ fd = open("/path/to/dir", O_TMPFILE | O_RDWR,
 
 /* File I/O on 'fd'... */
 
-snprintf(path, PATH_MAX,  "/proc/self/fd/%d", fd);
-linkat(AT_FDCWD, path, AT_FDCWD, "/path/for/file",
-                        AT_SYMLINK_FOLLOW);
+linkat(fd, NULL, AT_FDCWD, "/path/for/file", AT_EMPTY_PATH);
 .EE
 .in
 .IP
-- 
2.19.0