1 /*
2 * Low-level extraction code to overcome rust's libc not having the best access
3 * to siginfo_t details.
4 */
5 #include <stdbool.h>
6 #include <signal.h>
7 #include <stdint.h>
8
9 struct Const {
10 int native;
11 // The signal this applies to, or -1 if it applies to anything.
12 int signal;
13 uint8_t translated;
14 };
15
16 // Warning: must be in sync with the rust source code
17 struct Const consts[] = {
18 #ifdef SI_KERNEL
19 { SI_KERNEL, -1, 1 },
20 #endif
21 { SI_USER, -1, 2 },
22 #ifdef SI_TKILL
23 { SI_TKILL, -1, 3 },
24 #endif
25 { SI_QUEUE, -1, 4 },
26 { SI_MESGQ, -1, 5 },
27 { CLD_EXITED, SIGCHLD, 6 },
28 { CLD_KILLED, SIGCHLD, 7 },
29 { CLD_DUMPED, SIGCHLD, 8 },
30 { CLD_TRAPPED, SIGCHLD, 9 },
31 { CLD_STOPPED, SIGCHLD, 10 },
32 { CLD_CONTINUED, SIGCHLD, 11 },
33 };
34
sighook_signal_cause(const siginfo_t * info)35 uint8_t sighook_signal_cause(const siginfo_t *info) {
36 const size_t const_len = sizeof consts / sizeof *consts;
37 size_t i;
38 for (i = 0; i < const_len; i ++) {
39 if (
40 consts[i].native == info->si_code &&
41 (consts[i].signal == -1 || consts[i].signal == info->si_signo)
42 ) {
43 return consts[i].translated;
44 }
45 }
46 return 0; // The "Unknown" variant
47 }
48
sighook_signal_pid(const siginfo_t * info)49 pid_t sighook_signal_pid(const siginfo_t *info) {
50 return info->si_pid;
51 }
52
sighook_signal_uid(const siginfo_t * info)53 uid_t sighook_signal_uid(const siginfo_t *info) {
54 return info->si_uid;
55 }
56