1 | #include <signal.h>
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2 | #include <errno.h>
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3 | #include <string.h>
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4 | #include "syscall.h"
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5 | #include "pthread_impl.h"
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6 | #include "libc.h"
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7 | #include "ksigaction.h"
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8 |
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9 | static int unmask_done;
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10 | static unsigned long handler_set[_NSIG/(8*sizeof(long))];
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11 |
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12 | void __get_handler_set(sigset_t *set)
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13 | {
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14 | memcpy(set, handler_set, sizeof handler_set);
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15 | }
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16 |
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17 | int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
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18 | {
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19 | struct k_sigaction ksa, ksa_old;
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20 | if (sa) {
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21 | if ((uintptr_t)sa->sa_handler > 1UL) {
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22 | a_or_l(handler_set+(sig-1)/(8*sizeof(long)),
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23 | 1UL<<(sig-1)%(8*sizeof(long)));
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24 |
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25 | /* If pthread_create has not yet been called,
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26 | * implementation-internal signals might not
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27 | * yet have been unblocked. They must be
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28 | * unblocked before any signal handler is
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29 | * installed, so that an application cannot
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30 | * receive an illegal sigset_t (with them
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31 | * blocked) as part of the ucontext_t passed
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32 | * to the signal handler. */
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33 | if (!libc.threaded && !unmask_done) {
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34 | __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
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35 | SIGPT_SET, 0, _NSIG/8);
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36 | unmask_done = 1;
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37 | }
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38 | }
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39 | ksa.handler = sa->sa_handler;
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40 | ksa.flags = sa->sa_flags | SA_RESTORER;
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41 | ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
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42 | memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask);
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43 | }
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44 | if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, sizeof ksa.mask))
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45 | return -1;
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46 | if (old) {
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47 | old->sa_handler = ksa_old.handler;
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48 | old->sa_flags = ksa_old.flags;
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49 | memcpy(&old->sa_mask, &ksa_old.mask, sizeof ksa_old.mask);
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50 | }
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51 | return 0;
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52 | }
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53 |
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54 | int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
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55 | {
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56 | if (sig-32U < 3 || sig-1U >= _NSIG-1) {
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57 | errno = EINVAL;
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58 | return -1;
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59 | }
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60 | return __libc_sigaction(sig, sa, old);
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61 | }
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62 |
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63 | weak_alias(__sigaction, sigaction);
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