BuildSystem: Cleanup userspace directory layout

userspace programs are now in userspace/programs
userspace tests are now in userspace/tests

This makes listing userspace projects much cleaner. Libraries were
already separated to their own directory, so other programs should also.

userspace/tests/test-mmap-shared/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(test-mmap-shared ${SOURCES})
+banan_link_library(test-mmap-shared libc)
+
+install(TARGETS test-mmap-shared OPTIONAL)

userspace/tests/test-mmap-shared/main.cpp

@@ -0,0 +1,197 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define FILE_NAME "test-file"
+#define FILE_SIZE (1024*1024)
+
+int prepare_file()
+{
+	int fd = open(FILE_NAME, O_RDWR | O_TRUNC | O_CREAT, 0666);
+	if (fd == -1)
+	{
+		perror("open");
+		return 1;
+	}
+
+	void* null_buffer = malloc(FILE_SIZE);
+	memset(null_buffer, 0x00, FILE_SIZE);
+
+	if (write(fd, null_buffer, FILE_SIZE) == -1)
+	{
+		perror("write");
+		return 1;
+	}
+
+	free(null_buffer);
+	close(fd);
+
+	return 0;
+}
+
+int test1_job1()
+{
+	int fd = open(FILE_NAME, O_RDONLY);
+	if (fd == -1)
+	{
+		perror("open");
+		return 1;
+	}
+
+	void* addr = mmap(nullptr, FILE_SIZE, PROT_READ, MAP_SHARED, fd, 0);
+	if (addr == MAP_FAILED)
+	{
+		perror("mmap");
+		return 1;
+	}
+
+	sleep(4);
+
+	size_t sum = 0;
+	for (int i = 0; i < FILE_SIZE; i++)
+		sum += ((uint8_t*)addr)[i];
+
+	munmap(addr, FILE_SIZE);
+	close(fd);
+
+	printf("got:       %zu\n", sum);
+
+	exit(0);
+}
+
+int test1_job2()
+{
+	sleep(2);
+
+	int fd = open(FILE_NAME, O_RDWR);
+	if (fd == -1)
+	{
+		perror("open");
+		return 1;
+	}
+
+	void* addr = mmap(nullptr, FILE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (addr == MAP_FAILED)
+	{
+		perror("mmap");
+		return 1;
+	}
+
+	memset(addr, 'a', FILE_SIZE);
+
+	munmap(addr, FILE_SIZE);
+	close(fd);
+
+	printf("expecting: %zu\n", (size_t)'a' * FILE_SIZE);
+
+	return 0;
+}
+
+int test1()
+{
+	if (int ret = prepare_file())
+		return ret;
+
+	pid_t pid = fork();
+	if (pid == 0)
+		return test1_job1();
+
+	if (pid == -1)
+	{
+		perror("fork");
+		return 1;
+	}
+
+	int ret = test1_job2();
+	waitpid(pid, nullptr, 0);
+	return ret;
+}
+
+int test2_job1()
+{
+	sleep(2);
+
+	int fd = open(FILE_NAME, O_RDWR);
+	if (fd == -1)
+	{
+		perror("open");
+		return 1;
+	}
+
+	size_t value = 0;
+	if (read(fd, &value, sizeof(size_t)) == -1)
+	{
+		perror("read");
+		return 1;
+	}
+
+	printf("got:       %zu\n", value);
+
+	close(fd);
+
+	exit(0);
+}
+
+int test2_job2()
+{
+	int fd = open(FILE_NAME, O_RDWR);
+	if (fd == -1)
+	{
+		perror("open");
+		return 1;
+	}
+
+	void* addr = mmap(nullptr, FILE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	if (addr == MAP_FAILED)
+	{
+		perror("mmap");
+		return 1;
+	}
+
+	*(size_t*)addr = 0x12345678;
+
+	if (msync(addr, sizeof(size_t), MS_SYNC) == -1)
+	{
+		perror("msync");
+		return 1;
+	}
+
+	printf("expecting: %zu\n", *(size_t*)addr);
+
+	sleep(4);
+
+	munmap(addr, FILE_SIZE);
+	close(fd);
+
+	return 0;
+}
+
+int test2()
+{
+	if (int ret = prepare_file())
+		return ret;
+
+	pid_t pid = fork();
+	if (pid == 0)
+		return test2_job1();
+
+	if (pid == -1)
+	{
+		perror("fork");
+		return 1;
+	}
+
+	int ret = test2_job2();
+	waitpid(pid, nullptr, 0);
+	return ret;
+}
+
+int main()
+{
+	test1();
+	test2();
+}