user: reorganize the userland sources

1 files changed, 89 insertions, 0 deletions

diff --git a/src/user/app/main.c b/src/user/app/main.c
new file mode 100644
index 0000000..e59b5a6
--- /dev/null
+++ b/src/user/app/main.c
@@ -0,0 +1,89 @@
+#include <user/driver/driver.h>
+#include <user/fs/misc.h>
+#include <user/app/shell.h>
+#include <user/lib/stdlib.h>
+#include <user/fs/tar.h>
+#include <user/tests/main.h>
+#include <shared/flags.h>
+#include <shared/syscalls.h>
+#include <stdint.h>
+
+extern char _bss_start; // provided by the linker
+extern char _bss_end;
+extern char _initrd;
+
+void read_file(const char *path, size_t len);
+
+__attribute__((section(".text.startup")))
+int main(void) {
+	// allocate bss
+	_syscall_memflag(&_bss_start, &_bss_end - &_bss_start, MEMFLAG_PRESENT);
+
+	file_reopen(stdout, "/com1", 0);
+	printf("preinit\n");
+
+	/* move everything provided by the kernel to /kdev */
+	MOUNT("/kdev/", fs_passthru(NULL));
+	if (!fork2_n_mount("/")) {
+		const char *l[] = {"/kdev/", NULL};
+		fs_whitelist(l);
+	}
+	if (!fork2_n_mount("/")) fs_dir_inject("/kdev/"); // TODO should be part of fs_whitelist
+
+	MOUNT("/init/", tar_driver(&_initrd));
+	MOUNT("/tmp/", tmpfs_drv());
+	MOUNT("/keyboard", ps2_drv());
+	MOUNT("/vga_tty", ansiterm_drv());
+
+	MOUNT("/bind/", fs_passthru(NULL));
+
+	if (_syscall_fork(0, NULL)) {
+		/* (used to) expose a bug in the kernel
+		 * the program will flow like this:
+		 * 1. we launch the forked init
+		 * 2. the forked init launches both shells
+		 * 3. one of the shells quit
+		 * 4. the forked init picks it up and quits
+		 *
+		 * then, in process_kill, the other shell will be deathbedded
+		 *
+		 * before i implement(ed) reparenting, it was a lingering running child
+		 * of a dead process, which is invalid state
+		 */
+		_syscall_await();
+		_syscall_exit(1);
+	}
+
+	if (!_syscall_fork(0, NULL)) {
+		if (!file_reopen(stdout, "/kdev/com1", 0)) {
+			printf("couldn't open /kdev/com1\n"); // TODO borked
+			_syscall_exit(1);
+		}
+		if (!file_reopen(stdin, "/kdev/com1", 0)) {
+			printf("couldn't open /kdev/com1\n");
+			_syscall_exit(1);
+		}
+
+		shell_loop();
+		_syscall_exit(1);
+	}
+
+
+	if (!_syscall_fork(0, NULL)) {
+		if (!file_reopen(stdout, "/vga_tty", 0)) {
+			printf("couldn't open /vga_tty\n"); // TODO borked
+			_syscall_exit(1);
+		}
+		if (!file_reopen(stdin, "/keyboard", 0)) {
+			printf("couldn't open /keyboard\n");
+			_syscall_exit(1);
+		}
+
+		shell_loop();
+		_syscall_exit(1);
+	}
+
+	_syscall_await();
+	printf("init: quitting\n");
+	_syscall_exit(0);
+}