1 /*
2 * Copyright © 2018 Collabora, Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #ifndef FD_UTIL_H
27 #define FD_UTIL_H
28
29 #include <unistd.h>
30
31 static inline void
fd_update(int * fd,int new_fd)32 fd_update(int *fd, int new_fd)
33 {
34 if (*fd == new_fd)
35 return;
36 if (*fd >= 0)
37 close(*fd);
38 *fd = new_fd;
39 }
40
41 static inline void
fd_move(int * dest,int * src)42 fd_move(int *dest, int *src)
43 {
44 if (dest == src)
45 return;
46 fd_update(dest, *src);
47 *src = -1;
48 }
49
50 static inline void
fd_clear(int * fd)51 fd_clear(int *fd)
52 {
53 fd_update(fd, -1);
54 }
55
56 #endif /* FD_UTIL_H */
57