diff --git a/omo/src/os/linux/file.rs b/omo/src/os/linux/file.rs
index d771c28..a76e89f 100644
--- a/omo/src/os/linux/file.rs
+++ b/omo/src/os/linux/file.rs
@@ -10,7 +10,7 @@ pub fn open(path: &str, flags: u64, mode: u64) -> Result<i64, EmulatorError> {
         flags,
         open_mode,
     );
-    if fd == -1 {
+    if fd < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(fd)
@@ -19,7 +19,7 @@ pub fn open(path: &str, flags: u64, mode: u64) -> Result<i64, EmulatorError> {
 
 pub fn read(fd: u64, buf: u64, size: u64) -> Result<i64, EmulatorError> {
     let size = syscall_3(LinuxSysCalls::Read as u64, fd, buf, size);
-    if size == -1 {
+    if size < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(size)
@@ -28,7 +28,7 @@ pub fn read(fd: u64, buf: u64, size: u64) -> Result<i64, EmulatorError> {
 
 pub fn write(fd: u64, data: u64, len: u64) -> Result<i64, EmulatorError> {
     let size = syscall_3(LinuxSysCalls::Write as u64, fd, data, len);
-    if size == -1 {
+    if size < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(size)
@@ -37,7 +37,7 @@ pub fn write(fd: u64, data: u64, len: u64) -> Result<i64, EmulatorError> {
 
 pub fn close(fd: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_1(LinuxSysCalls::Close as u64, fd);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -46,7 +46,7 @@ pub fn close(fd: u64) -> Result<i64, EmulatorError> {
 
 pub fn lseek(fd: u64, offset: u64, whence: u64) -> Result<i64, EmulatorError> {
     let off = syscall_3(LinuxSysCalls::Lseek as u64, fd, offset, whence);
-    if off == -1 {
+    if off < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(off)
@@ -55,7 +55,7 @@ pub fn lseek(fd: u64, offset: u64, whence: u64) -> Result<i64, EmulatorError> {
 
 pub fn fcntl(fd: u64, cmd: u64, arg: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_3(LinuxSysCalls::Fcntl as u64, fd, cmd, arg);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -69,7 +69,7 @@ pub fn readlink(path: &str, buf: u64, buf_size: u64) -> Result<i64, EmulatorErro
         buf,
         buf_size,
     );
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -78,7 +78,7 @@ pub fn readlink(path: &str, buf: u64, buf_size: u64) -> Result<i64, EmulatorErro
 
 pub fn stat(path: &str, stat_buf: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_2(LinuxSysCalls::Stat as u64, path.as_ptr() as u64, stat_buf);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -87,7 +87,7 @@ pub fn stat(path: &str, stat_buf: u64) -> Result<i64, EmulatorError> {
 
 pub fn fstat(fd: u64, stat_buf: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_2(LinuxSysCalls::Fstat as u64, fd, stat_buf);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -96,7 +96,7 @@ pub fn fstat(fd: u64, stat_buf: u64) -> Result<i64, EmulatorError> {
 
 pub fn lstat(path: &str, stat_buf: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_2(LinuxSysCalls::Lstat as u64, path.as_ptr() as u64, stat_buf);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -111,7 +111,7 @@ pub fn fstatat64(dir_fd: u64, path: &str, stat_buf: u64, flags: u64) -> Result<i
         stat_buf,
         flags,
     );
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)
@@ -120,7 +120,7 @@ pub fn fstatat64(dir_fd: u64, path: &str, stat_buf: u64, flags: u64) -> Result<i
 
 pub fn ioctl(fd: u64, cmd: u64, arg: u64) -> Result<i64, EmulatorError> {
     let ret = syscall_3(LinuxSysCalls::Ioctl as u64, fd, cmd, arg);
-    if ret == -1 {
+    if ret < 0 {
         Err(EmulatorError::IOError(io::Error::last_os_error()))
     } else {
         Ok(ret)