Add getuid, getgid, geteuid, getegid, etc.

src/libos/src/process/process.rs

@@ -10,7 +10,7 @@ lazy_static! {
             task: Default::default(),
             status: Default::default(),
             pid: 0,
-            pgid: 0,
+            pgid: 1,
             tgid: 0,
             exit_status: 0,
             cwd: "/".to_owned(),
@@ -38,7 +38,7 @@ impl Process {
             task: task,
             status: Default::default(),
             pid: new_pid,
-            pgid: new_pid,
+            pgid: 1, // TODO: implement pgid
             tgid: new_pid,
             cwd: cwd.to_owned(),
             clear_child_tid: None,

src/libos/src/process/thread.rs

@@ -68,6 +68,8 @@ pub fn do_clone(
         let mut new_thread = new_thread_ref.lock().unwrap();
         parent.children.push(Arc::downgrade(&new_thread_ref));
         new_thread.parent = Some(parent_ref.clone());
+
+        new_thread.tgid = current.tgid;
     }
 
     process_table::put(new_thread_pid, new_thread_ref.clone());

src/libos/src/syscall/mod.rs

@@ -86,6 +86,12 @@ pub extern "C" fn dispatch_syscall(
         SYS_GETPID => do_getpid(),
         SYS_GETTID => do_gettid(),
         SYS_GETPPID => do_getppid(),
+        SYS_GETPGID => do_getpgid(),
+
+        SYS_GETUID => do_getuid(),
+        SYS_GETGID => do_getgid(),
+        SYS_GETEUID => do_geteuid(),
+        SYS_GETEGID => do_getegid(),
 
         SYS_RT_SIGACTION => do_rt_sigaction(),
         SYS_RT_SIGPROCMASK => do_rt_sigprocmask(),
@@ -577,6 +583,30 @@ fn do_getppid() -> Result<isize, Error> {
     Ok(ppid as isize)
 }
 
+fn do_getpgid() -> Result<isize, Error> {
+    let pgid = process::do_getpgid();
+    Ok(pgid as isize)
+}
+
+// TODO: implement uid, gid, euid, egid
+
+fn do_getuid() -> Result<isize, Error> {
+    Ok(0)
+}
+
+fn do_getgid() -> Result<isize, Error> {
+    Ok(0)
+}
+
+fn do_geteuid() -> Result<isize, Error> {
+    Ok(0)
+}
+
+fn do_getegid() -> Result<isize, Error> {
+    Ok(0)
+}
+
+
 fn do_pipe2(fds_u: *mut i32, flags: u32) -> Result<isize, Error> {
     check_mut_array(fds_u, 2)?;
     // TODO: how to deal with open flags???