-#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <string.h>
#include "libc.h"
#include "ksigaction.h"
-void __restore(), __restore_rt();
+static int unmask_done;
+static unsigned long handler_set[_NSIG/(8*sizeof(long))];
-static pthread_t dummy(void) { return 0; }
-weak_alias(dummy, __pthread_self_def);
+void __get_handler_set(sigset_t *set)
+{
+ memcpy(set, handler_set, sizeof handler_set);
+}
int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
{
- struct k_sigaction ksa;
+ struct k_sigaction ksa, ksa_old;
+ if (sig >= (unsigned)_NSIG) {
+ errno = EINVAL;
+ return -1;
+ }
if (sa) {
- if ((uintptr_t)sa->sa_handler > 1UL)
- __pthread_self_def();
+ if ((uintptr_t)sa->sa_handler > 1UL) {
+ a_or_l(handler_set+(sig-1)/(8*sizeof(long)),
+ 1UL<<(sig-1)%(8*sizeof(long)));
+
+ /* If pthread_create has not yet been called,
+ * implementation-internal signals might not
+ * yet have been unblocked. They must be
+ * unblocked before any signal handler is
+ * installed, so that an application cannot
+ * receive an illegal sigset_t (with them
+ * blocked) as part of the ucontext_t passed
+ * to the signal handler. */
+ if (!libc.threaded && !unmask_done) {
+ __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
+ SIGPT_SET, 0, _NSIG/8);
+ unmask_done = 1;
+ }
+ }
ksa.handler = sa->sa_handler;
ksa.flags = sa->sa_flags | SA_RESTORER;
ksa.restorer = (sa->sa_flags & SA_SIGINFO) ? __restore_rt : __restore;
memcpy(&ksa.mask, &sa->sa_mask, sizeof ksa.mask);
}
- if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa:0, sizeof ksa.mask))
+ if (syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, sizeof ksa.mask))
return -1;
if (old) {
- old->sa_handler = ksa.handler;
- old->sa_flags = ksa.flags;
- memcpy(&old->sa_mask, &ksa.mask, sizeof ksa.mask);
+ old->sa_handler = ksa_old.handler;
+ old->sa_flags = ksa_old.flags;
+ memcpy(&old->sa_mask, &ksa_old.mask, sizeof ksa_old.mask);
}
return 0;
}