diff options
Diffstat (limited to 'networking/udhcp/signalpipe.c')
-rw-r--r-- | networking/udhcp/signalpipe.c | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/networking/udhcp/signalpipe.c b/networking/udhcp/signalpipe.c deleted file mode 100644 index 074c8a603..000000000 --- a/networking/udhcp/signalpipe.c +++ /dev/null | |||
@@ -1,78 +0,0 @@ | |||
1 | /* signalpipe.c | ||
2 | * | ||
3 | * Signal pipe infrastructure. A reliable way of delivering signals. | ||
4 | * | ||
5 | * Russ Dill <Russ.Dill@asu.edu> December 2003 | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License as published by | ||
9 | * the Free Software Foundation; either version 2 of the License, or | ||
10 | * (at your option) any later version. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
15 | * GNU General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
20 | */ | ||
21 | |||
22 | #include <unistd.h> | ||
23 | #include <signal.h> | ||
24 | #include <sys/types.h> | ||
25 | #include <sys/socket.h> | ||
26 | #include <sys/select.h> | ||
27 | |||
28 | |||
29 | #include "signalpipe.h" | ||
30 | #include "common.h" | ||
31 | |||
32 | static int signal_pipe[2]; | ||
33 | |||
34 | static void signal_handler(int sig) | ||
35 | { | ||
36 | if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) | ||
37 | DEBUG(LOG_ERR, "Could not send signal: %m"); | ||
38 | } | ||
39 | |||
40 | |||
41 | /* Call this before doing anything else. Sets up the socket pair | ||
42 | * and installs the signal handler */ | ||
43 | void udhcp_sp_setup(void) | ||
44 | { | ||
45 | socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe); | ||
46 | signal(SIGUSR1, signal_handler); | ||
47 | signal(SIGUSR2, signal_handler); | ||
48 | signal(SIGTERM, signal_handler); | ||
49 | } | ||
50 | |||
51 | |||
52 | /* Quick little function to setup the rfds. Will return the | ||
53 | * max_fd for use with select. Limited in that you can only pass | ||
54 | * one extra fd */ | ||
55 | int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) | ||
56 | { | ||
57 | FD_ZERO(rfds); | ||
58 | FD_SET(signal_pipe[0], rfds); | ||
59 | if (extra_fd >= 0) FD_SET(extra_fd, rfds); | ||
60 | return signal_pipe[0] > extra_fd ? signal_pipe[0] : extra_fd; | ||
61 | } | ||
62 | |||
63 | |||
64 | /* Read a signal from the signal pipe. Returns 0 if there is | ||
65 | * no signal, -1 on error (and sets errno appropriately), and | ||
66 | * your signal on success */ | ||
67 | int udhcp_sp_read(fd_set *rfds) | ||
68 | { | ||
69 | int sig; | ||
70 | |||
71 | if (!FD_ISSET(signal_pipe[0], rfds)) | ||
72 | return 0; | ||
73 | |||
74 | if (read(signal_pipe[0], &sig, sizeof(sig)) < 0) | ||
75 | return -1; | ||
76 | |||
77 | return sig; | ||
78 | } | ||