1 files changed, 84 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/signal/sigaction.c b/libc-top-half/musl/src/signal/sigaction.c
new file mode 100644
index 0000000..2203471
--- /dev/null
+++ b/libc-top-half/musl/src/signal/sigaction.c
@@ -0,0 +1,84 @@
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include "syscall.h"
+#include "pthread_impl.h"
+#include "libc.h"
+#include "lock.h"
+#include "ksigaction.h"
+
+static int unmask_done;
+static unsigned long handler_set[_NSIG/(8*sizeof(long))];
+
+void __get_handler_set(sigset_t *set)
+{
+	memcpy(set, handler_set, sizeof handler_set);
+}
+
+volatile int __eintr_valid_flag;
+
+int __libc_sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
+{
+	struct k_sigaction ksa, ksa_old;
+	if (sa) {
+		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;
+			}
+
+			if (!(sa->sa_flags & SA_RESTART)) {
+				a_store(&__eintr_valid_flag, 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, _NSIG/8);
+	}
+	int r = __syscall(SYS_rt_sigaction, sig, sa?&ksa:0, old?&ksa_old:0, _NSIG/8);
+	if (old && !r) {
+		old->sa_handler = ksa_old.handler;
+		old->sa_flags = ksa_old.flags;
+		memcpy(&old->sa_mask, &ksa_old.mask, _NSIG/8);
+	}
+	return __syscall_ret(r);
+}
+
+int __sigaction(int sig, const struct sigaction *restrict sa, struct sigaction *restrict old)
+{
+	unsigned long set[_NSIG/(8*sizeof(long))];
+
+	if (sig-32U < 3 || sig-1U >= _NSIG-1) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	/* Doing anything with the disposition of SIGABRT requires a lock,
+	 * so that it cannot be changed while abort is terminating the
+	 * process and so any change made by abort can't be observed. */
+	if (sig == SIGABRT) {
+		__block_all_sigs(&set);
+		LOCK(__abort_lock);
+	}
+	int r = __libc_sigaction(sig, sa, old);
+	if (sig == SIGABRT) {
+		UNLOCK(__abort_lock);
+		__restore_sigs(&set);
+	}
+	return r;
+}
+
+weak_alias(__sigaction, sigaction);