posix, managarm: implement sigpending

options/posix/generic/posix_signal.cpp

@@ -112,9 +112,15 @@ int sigwait(const sigset_t *__restrict set, int *__restrict sig) {
 	}
 }
 
-int sigpending(sigset_t *) {
-	__ensure(!"sigpending() not implemented");
-	__builtin_unreachable();
+int sigpending(sigset_t *set) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sigpending, -1);
+
+	if(int e = sysdep(set)) {
+		errno = e;
+		return -1;
+	}
+
+	return 0;
 }
 
 int sigaltstack(const stack_t *__restrict ss, stack_t *__restrict oss) {

options/posix/include/mlibc/posix-sysdeps.hpp

@@ -189,6 +189,7 @@ int sys_vm_unmap(void *pointer, size_t size);
 [[gnu::weak]] int sys_fchownat(int dirfd, const char *pathname, uid_t owner, gid_t group, int flags);
 [[gnu::weak]] int sys_sigaltstack(const stack_t *ss, stack_t *oss);
 [[gnu::weak]] int sys_sigsuspend(const sigset_t *set);
+[[gnu::weak]] int sys_sigpending(sigset_t *set);
 [[gnu::weak]] int sys_setgroups(size_t size, const gid_t *list);
 [[gnu::weak]] int sys_statfs(const char *path, struct statfs *buf);
 [[gnu::weak]] int sys_fstatfs(int fd, struct statfs *buf);

sysdeps/managarm/generic/signals.cpp

@@ -127,4 +127,13 @@ int sys_sigsuspend(const sigset_t *set) {
 	return EINTR;
 }
 
+int sys_sigpending(sigset_t *set) {
+	uint64_t pendingMask;
+
+	HEL_CHECK(helSyscall0_1(kHelObserveSuperCall + posix::superSigGetPending, &pendingMask));
+	*set = pendingMask;
+
+	return 0;
+}
+
 } //namespace mlibc