Add gettimeofday() syscall and LibC wrappers gettimeofday() and time().

This only has second accuracy right now, I'll work out subseconds later.

Userland/.gitignore

@@ -4,4 +4,5 @@ ps
 ls
 pwd
 sleep
+date
 *.o

Userland/Makefile

@@ -4,7 +4,8 @@ OBJS = \
        ps.o \
        ls.o \
        pwd.o \
-       sleep.o
+       sleep.o \
+       date.o
 
 APPS = \
        id \
@@ -12,7 +13,8 @@ APPS = \
        ps \
        ls \
        pwd \
-       sleep
+       sleep \
+       date
 
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
@@ -50,6 +52,9 @@ pwd: pwd.o
 sleep: sleep.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+date: date.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/date.cpp

@@ -0,0 +1,10 @@
+#include <LibC/time.h>
+#include <LibC/stdio.h>
+
+int main(int c, char** v)
+{
+    time_t now = time(nullptr);
+    printf("%u\n", now);
+    return 0;
+}
+