fix split_path. add test for getcwd, mkdir, rmdir, chdir.

src/libos/src/fs/mod.rs

@@ -248,6 +248,7 @@ pub fn do_dup3(old_fd: FileDesc, new_fd: FileDesc, flags: u32) -> Result<FileDes
 }
 
 pub fn do_sync() -> Result<(), Error> {
+    info!("sync:");
     ROOT_INODE.fs().sync()?;
     Ok(())
 }
@@ -255,6 +256,8 @@ pub fn do_sync() -> Result<(), Error> {
 pub fn do_chdir(path: &str) -> Result<(), Error> {
     let current_ref = process::get_current();
     let mut current_process = current_ref.lock().unwrap();
+    info!("chdir: path: {:?}", path);
+
     let inode = current_process.lookup_inode(path)?;
     let info = inode.metadata()?;
     if info.type_ != FileType::Dir {
@@ -364,7 +367,10 @@ impl Process {
 fn split_path(path: &str) -> (&str, &str) {
     let mut split = path.trim_end_matches('/').rsplitn(2, '/');
     let file_name = split.next().unwrap();
-    let dir_path = split.next().unwrap_or(".");
+    let mut dir_path = split.next().unwrap_or(".");
+    if dir_path == "" {
+        dir_path = "/";
+    }
     (dir_path, file_name)
 }
 

test/Makefile

@@ -4,7 +4,7 @@ PROJECT_DIR := $(realpath $(CUR_DIR)/../)
 # Dependencies: need to be compiled but not to run by any Makefile target
 TEST_DEPS := dev_null
 # Tests: need to be compiled and run by test-% target
-TESTS := empty argv hello_world malloc file getpid spawn pipe time truncate readdir
+TESTS := empty argv hello_world malloc file getpid spawn pipe time truncate readdir mkdir
 # Benchmarks: need to be compiled and run by bench-% target
 BENCHES := spawn_and_exit_latency pipe_throughput
 

test/mkdir/Makefile

@@ -0,0 +1,5 @@
+include ../test_common.mk
+
+EXTRA_C_FLAGS :=
+EXTRA_LINK_FLAGS :=
+BIN_ARGS :=

test/mkdir/main.c

@@ -0,0 +1,67 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+int main(int argc, const char* argv[]) {
+
+	const int BUF_SIZE = 10;
+	char buf[10];
+	int ret;
+
+	char* cwd = getcwd(buf, BUF_SIZE);
+	if(cwd != buf) {
+		printf("failed to getcwd\n");
+		return -1;
+	}
+
+	const char expect_cwd[] = "/";
+	if(strcmp(buf, expect_cwd)) {
+		printf("incorrect cwd \"%s\". expect \"%s\".\n", buf, expect_cwd);
+		return -1;
+	}
+
+	const char DIR_NAME[] = "test_dir";
+	const char DIR_PATH[] = "/test_dir";
+	const int DIR_MODE = 0664;
+	ret = mkdir(DIR_NAME, DIR_MODE);
+	if(ret < 0) {
+		printf("failed to mkdir \"%s\"", DIR_NAME);
+		return ret;
+	}
+
+	ret = chdir(DIR_NAME);
+	if(ret < 0) {
+		printf("failed to chdir to \"%s\"", DIR_NAME);
+		return ret;
+	}
+
+	cwd = getcwd(buf, BUF_SIZE);
+	if(cwd != buf) {
+		printf("failed to getcwd\n");
+		return -1;
+	}
+
+	if(strcmp(buf, DIR_PATH)) {
+		printf("incorrect cwd \"%s\". expect \"%s\".\n", buf, DIR_PATH);
+		return -1;
+	}
+
+	ret = rmdir(DIR_PATH);
+	if(ret < 0) {
+		printf("failed to rmdir \"%s\"", DIR_PATH);
+		return ret;
+	}
+
+	struct stat stat_buf;
+	ret = stat(DIR_PATH, &stat_buf);
+	if(!(ret < 0 && errno == ENOENT)) {
+		printf("stat on \"%s\" should return ENOENT", DIR_PATH);
+		return ret;
+	}
+
+    printf("getcwd, mkdir, rmdir, chdir test successful\n");
+    return 0;
+}