provide some _posix functions for process control

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PosixModuleBuiltins.java

@@ -126,6 +126,9 @@ public class PosixModuleBuiltins extends PythonBuiltins {
     private static final int SEEK_CUR = 1;
     private static final int SEEK_END = 2;
 
+    private static final int WNOHANG = 1;
+    private static final int WUNTRACED = 3;
+
     private static final int F_OK = 0;
     private static final int X_OK = 1;
 
@@ -248,6 +251,9 @@ public PosixModuleBuiltins() {
         builtinConstants.put("SEEK_CUR", SEEK_CUR);
         builtinConstants.put("SEEK_END", SEEK_END);
 
+        builtinConstants.put("WNOHANG", WNOHANG);
+        builtinConstants.put("WUNTRACED", WUNTRACED);
+
         builtinConstants.put("F_OK", F_OK);
         builtinConstants.put("X_OK", X_OK);
     }
@@ -1018,6 +1024,16 @@ private int getLength(PTuple times) {
         }
     }
 
+    @Builtin(name = "waitpid", fixedNumOfPositionalArgs = 2)
+    @GenerateNodeFactory
+    abstract static class WaitpidNode extends PythonBinaryBuiltinNode {
+        @SuppressWarnings("unused")
+        @Specialization
+        PTuple waitpid(int pid, int options) {
+            throw raise(NotImplementedError, "waitpid");
+        }
+    }
+
     // FIXME: this is not nearly ready, just good enough for now
     @Builtin(name = "system", fixedNumOfPositionalArgs = 1)
     @GenerateNodeFactory

graalpython/lib-graalpython/posix.py

@@ -97,3 +97,33 @@ def __next__(self):
 @__builtin__
 def scandir(path):
     return ScandirIterator(iter(listdir(path)))
+
+
+@__builtin__
+def WIFSIGNALED(status):
+    return status > 128
+
+
+@__builtin__
+def WIFEXITED(status):
+    return not WIFSIGNALED(status)
+
+
+@__builtin__
+def WTERMSIG(status):
+    return status - 128
+
+
+@__builtin__
+def WEXITSTATUS(status):
+    return status & 127
+
+
+@__builtin__
+def WIFSTOPPED(status):
+    return False
+
+
+@__builtin__
+def WSTOPSIG(status):
+    return 0