1 | /* Copyright (C) 2003-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <pthread.h> |
19 | #include <signal.h> |
20 | #include <unistd.h> |
21 | #include <support/xthread.h> |
22 | #include <support/xsignal.h> |
23 | #include <support/xthread.h> |
24 | |
25 | |
26 | static int the_sig; |
27 | |
28 | |
29 | static void |
30 | eintr_handler (int sig) |
31 | { |
32 | if (sig != the_sig) |
33 | { |
34 | /* empty if statement avoids warn unused result */ |
35 | if (write (STDOUT_FILENO, |
36 | "eintr_handler: signal number wrong\n" , 35) < 35) {}; |
37 | _exit (1); |
38 | } |
39 | if (write (STDOUT_FILENO, "." , 1)) {/* Avoid warn unused result */}; |
40 | } |
41 | |
42 | |
43 | static void * |
44 | eintr_source (void *arg) |
45 | { |
46 | struct timespec ts = { .tv_sec = 0, .tv_nsec = 500000 }; |
47 | |
48 | if (arg == NULL) |
49 | { |
50 | sigset_t ss; |
51 | sigemptyset (&ss); |
52 | sigaddset (&ss, the_sig); |
53 | xpthread_sigmask (SIG_BLOCK, set: &ss, NULL); |
54 | } |
55 | |
56 | while (1) |
57 | { |
58 | if (arg != NULL) |
59 | pthread_kill (threadid: *(pthread_t *) arg, signo: the_sig); |
60 | else |
61 | kill (pid: getpid (), sig: the_sig); |
62 | |
63 | nanosleep (requested_time: &ts, NULL); |
64 | } |
65 | |
66 | /* NOTREACHED */ |
67 | return NULL; |
68 | } |
69 | |
70 | |
71 | static void |
72 | setup_eintr (int sig, pthread_t *thp) |
73 | { |
74 | struct sigaction sa; |
75 | sigemptyset (&sa.sa_mask); |
76 | sa.sa_flags = 0; |
77 | sa.sa_handler = eintr_handler; |
78 | if (sigaction (sig: sig, act: &sa, NULL) != 0) |
79 | { |
80 | puts (s: "setup_eintr: sigaction failed" ); |
81 | exit (1); |
82 | } |
83 | the_sig = sig; |
84 | |
85 | /* Create the thread which will fire off the signals. */ |
86 | xpthread_create (NULL, thread_func: eintr_source, closure: thp); |
87 | } |
88 | |