Add a "sleep" syscall that sleeps for N seconds.

Userland/.gitignore

@@ -3,4 +3,5 @@ sh
 ps
 ls
 pwd
+sleep
 *.o

Userland/Makefile

@@ -3,14 +3,16 @@ OBJS = \
        sh.o \
        ps.o \
        ls.o \
-       pwd.o
+       pwd.o \
+       sleep.o
 
 APPS = \
        id \
        sh \
        ps \
        ls \
-       pwd
+       pwd \
+       sleep
 
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
@@ -45,6 +47,9 @@ ls: ls.o
 pwd: pwd.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+sleep: sleep.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/sleep.cpp

@@ -0,0 +1,10 @@
+#include <LibC/unistd.h>
+#include <LibC/stdio.h>
+
+int main(int c, char** v)
+{
+    unsigned secs = 10;
+    sleep(secs);
+    return 0;
+}
+