user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/posix/generic/posix_signal.cpp

@@ -0,0 +1,164 @@
+
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <bits/ensure.h>
+
+#include <mlibc/posix-sysdeps.hpp>
+#include <mlibc/tcb.hpp>
+
+int sigsuspend(const sigset_t *sigmask) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sigsuspend, -1);
+
+	// This is guaranteed to return an error (EINTR most probably)
+	errno = mlibc::sys_sigsuspend(sigmask);
+	return -1;
+}
+
+int pthread_sigmask(int how, const sigset_t *__restrict set, sigset_t *__restrict retrieve) {
+ 	if(mlibc::sys_thread_sigmask) {
+	 	if(int e = mlibc::sys_thread_sigmask(how, set, retrieve); e) {
+	 	 	return e;
+	 	}
+ 	 	return 0;
+ 	}
+
+	if(!mlibc::sys_sigprocmask) {
+		MLIBC_MISSING_SYSDEP();
+		return ENOSYS;
+	}
+	if(int e = mlibc::sys_sigprocmask(how, set, retrieve); e) {
+		return e;
+	}
+	return 0;
+}
+
+int pthread_kill(pthread_t thread, int sig) {
+	auto tcb = reinterpret_cast<Tcb *>(thread);
+	auto pid = getpid();
+
+	if(!mlibc::sys_tgkill) {
+		MLIBC_MISSING_SYSDEP();
+		return ENOSYS;
+	}
+
+	if(int e = mlibc::sys_tgkill(pid, tcb->tid, sig); e) {
+		return e;
+	}
+
+	return 0;
+}
+
+int sigaction(int signum, const struct sigaction *__restrict act, struct sigaction *__restrict oldact) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sigaction, -1);
+	if(int e = mlibc::sys_sigaction(signum, act, oldact); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int siginterrupt(int sig, int flag) {
+	int ret;
+	struct sigaction act;
+
+	sigaction(sig, nullptr, &act);
+	if (flag)
+		act.sa_flags &= ~SA_RESTART;
+	else
+		act.sa_flags |= SA_RESTART;
+
+	ret = sigaction(sig, &act, nullptr);
+	return ret;
+}
+
+int kill(pid_t pid, int number) {
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_kill, -1);
+	if(int e = mlibc::sys_kill(pid, number); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int killpg(pid_t pgrp, int sig) {
+	if(pgrp > 1) {
+		return kill(-pgrp, sig);
+	}
+
+	errno = EINVAL;
+	return -1;
+}
+
+int sigtimedwait(const sigset_t *__restrict set, siginfo_t *__restrict info, const struct timespec *__restrict timeout) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sigtimedwait, -1);
+
+	int signo;
+
+	if (int e = sysdep(set, info, timeout, &signo)) {
+		errno = e;
+		return -1;
+	}
+
+	return signo;
+}
+
+int sigwaitinfo(const sigset_t *__restrict set, siginfo_t *__restrict info) {
+	// NOTE: This assumes the sysdep behavior noted in mlibc/posix-sysdeps.hpp
+	return sigtimedwait(set, info, nullptr);
+}
+
+int sigwait(const sigset_t *__restrict set, int *__restrict sig) {
+	if (int e = sigwaitinfo(set, nullptr); e < 0) {
+		return e;
+	} else {
+		if (sig)
+			*sig = e;
+
+		return 0;
+	}
+}
+
+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) {
+	if (ss && ss->ss_size < MINSIGSTKSZ && !(ss->ss_flags & SS_DISABLE)) {
+		errno = ENOMEM;
+		return -1;
+	}
+
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_sigaltstack, -1);
+	if (int e = mlibc::sys_sigaltstack(ss, oss); e) {
+		errno = e;
+		return -1;
+	}
+
+	return 0;
+}
+
+#if __MLIBC_GLIBC_OPTION
+int sigisemptyset(const sigset_t *set) {
+	auto ptr = reinterpret_cast<const char *>(set);
+	for(size_t i = 0; i < sizeof(sigset_t); i++) {
+		if(ptr[i]) {
+			return 0;
+		}
+	}
+	return 1;
+}
+#endif // __MLIBC_GLIBC_OPTION
+
+int sigqueue(pid_t, int, const union sigval) {
+	__ensure(!"sigqueue() not implemented");
+	__builtin_unreachable();
+}
+