Add build system scaffolding and libc headers

1 files changed, 41 insertions, 0 deletions

diff --git a/include/bits/select.h b/include/bits/select.h
new file mode 100644
index 00000000..f1f952ab
--- /dev/null
+++ b/include/bits/select.h
@@ -0,0 +1,41 @@
+#ifndef __BITS_SELECT_H
+#define __BITS_SELECT_H
+
+#ifndef __BITS_SELECT_H_
+#error "Internal header — include the public API header instead."
+#endif
+
+#define FD_SETSIZE 1024
+
+#define FD_ZERO(set)                                                     \
+	do {                                                             \
+		for (size_t i = 0;                                       \
+		     i < sizeof((set)->fds_bits) / sizeof(fd_mask); i++) \
+			(set)->fds_bits[i] = 0;                          \
+	} while (0)
+
+#define FD_SET(fd, set)                                   \
+	((set)->fds_bits[(fd) / (8 * sizeof(fd_mask))] |= \
+	 (1UL << ((fd) % (8 * sizeof(fd_mask)))))
+
+#define FD_CLR(fd, set)                                   \
+	((set)->fds_bits[(fd) / (8 * sizeof(fd_mask))] &= \
+	 ~(1UL << ((fd) % (8 * sizeof(fd_mask)))))
+
+#define FD_ISSET(fd, set)                                 \
+	(((set)->fds_bits[(fd) / (8 * sizeof(fd_mask))] & \
+	  (1UL << ((fd) % (8 * sizeof(fd_mask))))) != 0)
+
+typedef __INT64_TYPE__ time_t;
+typedef __INT64_TYPE__ suseconds_t;
+
+typedef struct {
+	unsigned long fds_bits[1024 / (8 * sizeof(unsigned long))];
+} fd_set;
+
+struct timeval {
+	time_t tv_sec;
+	suseconds_t tv_usec;
+};
+
+#endif