user: implement mlibc as the libc, finally.

It's finally done..

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

user/include/mlibc/options/posix/generic/sys-select.cpp

@@ -0,0 +1,58 @@
+
+#include <string.h>
+#include <sys/select.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <bits/ensure.h>
+#include <mlibc-config.h>
+
+#include <mlibc/posix-sysdeps.hpp>
+
+void __FD_CLR(int fd, fd_set *set) {
+	__ensure(fd < FD_SETSIZE);
+	set->fds_bits[fd / 8] &= ~(1 << (fd % 8));
+}
+int __FD_ISSET(int fd, fd_set *set) {
+	__ensure(fd < FD_SETSIZE);
+	return set->fds_bits[fd / 8] & (1 << (fd % 8));
+}
+void __FD_SET(int fd, fd_set *set) {
+	__ensure(fd < FD_SETSIZE);
+	set->fds_bits[fd / 8] |= 1 << (fd % 8);
+}
+void __FD_ZERO(fd_set *set) {
+	memset(set->fds_bits, 0, sizeof(fd_set));
+}
+
+int select(int num_fds, fd_set *__restrict read_set, fd_set *__restrict write_set,
+		fd_set *__restrict except_set, struct timeval *__restrict timeout) {
+	int num_events = 0;
+	struct timespec timeouts = {};
+	struct timespec *timeout_ptr = nullptr;
+	if (timeout) {
+		timeouts.tv_sec = timeout->tv_sec;
+		timeouts.tv_nsec = timeout->tv_usec * 1000;
+		timeout_ptr = &timeouts;
+	}
+
+    MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pselect, -1);
+	if(int e = mlibc::sys_pselect(num_fds, read_set, write_set, except_set,
+				timeout_ptr, nullptr, &num_events); e) {
+		errno = e;
+		return -1;
+	}
+	return num_events;
+}
+
+int pselect(int num_fds, fd_set *__restrict read_set, fd_set *__restrict write_set,
+		fd_set *__restrict except_set, const struct timespec *timeout, const sigset_t *sigmask) {
+	int num_events = 0;
+	MLIBC_CHECK_OR_ENOSYS(mlibc::sys_pselect, -1);
+	if(int e = mlibc::sys_pselect(num_fds, read_set, write_set, except_set,
+				timeout, sigmask, &num_events); e) {
+		errno = e;
+		return -1;
+	}
+	return num_events;
+}