Start adding a basic /proc filesystem and a "ps" utility.

Userland/.gitignore

@@ -1,3 +1,4 @@
 id
 sh
+ps
 *.o

Userland/Makefile

@@ -1,10 +1,12 @@
 OBJS = \
        id.o \
-       sh.o
+       sh.o \
+       ps.o
 
 APPS = \
        id \
-       sh
+       sh \
+       ps
 
 ARCH_FLAGS =
 STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib
@@ -30,6 +32,9 @@ id: id.o
 sh: sh.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+ps: ps.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 

Userland/ps.cpp

@@ -0,0 +1,25 @@
+#include <LibC/stdio.h>
+#include <LibC/unistd.h>
+
+int main(int c, char** v)
+{
+    int fd = open("/proc/summary");
+    if (fd == -1) {
+        printf("failed to open /proc/summary :(\n");
+        return 1;
+    }
+    for (;;) {
+        char buf[16];
+        ssize_t nread = read(fd, buf, sizeof(buf));
+        if (nread == 0)
+            break;
+        if (nread < 0) {
+            printf("failed to read :(\n");
+            return 2;
+        }
+        for (ssize_t i = 0; i < nread; ++i) {
+            putchar(buf[i]);
+        }
+    }
+    return 0;
+}