Add project files.

env/Lib/site-packages/gunicorn/pidfile.py

@@ -0,0 +1,85 @@
+#
+# This file is part of gunicorn released under the MIT license.
+# See the NOTICE for more information.
+
+import errno
+import os
+import tempfile
+
+
+class Pidfile:
+    """\
+    Manage a PID file. If a specific name is provided
+    it and '"%s.oldpid" % name' will be used. Otherwise
+    we create a temp file using os.mkstemp.
+    """
+
+    def __init__(self, fname):
+        self.fname = fname
+        self.pid = None
+
+    def create(self, pid):
+        oldpid = self.validate()
+        if oldpid:
+            if oldpid == os.getpid():
+                return
+            msg = "Already running on PID %s (or pid file '%s' is stale)"
+            raise RuntimeError(msg % (oldpid, self.fname))
+
+        self.pid = pid
+
+        # Write pidfile
+        fdir = os.path.dirname(self.fname)
+        if fdir and not os.path.isdir(fdir):
+            raise RuntimeError("%s doesn't exist. Can't create pidfile." % fdir)
+        fd, fname = tempfile.mkstemp(dir=fdir)
+        os.write(fd, ("%s\n" % self.pid).encode('utf-8'))
+        if self.fname:
+            os.rename(fname, self.fname)
+        else:
+            self.fname = fname
+        os.close(fd)
+
+        # set permissions to -rw-r--r--
+        os.chmod(self.fname, 420)
+
+    def rename(self, path):
+        self.unlink()
+        self.fname = path
+        self.create(self.pid)
+
+    def unlink(self):
+        """ delete pidfile"""
+        try:
+            with open(self.fname) as f:
+                pid1 = int(f.read() or 0)
+
+            if pid1 == self.pid:
+                os.unlink(self.fname)
+        except Exception:
+            pass
+
+    def validate(self):
+        """ Validate pidfile and make it stale if needed"""
+        if not self.fname:
+            return
+        try:
+            with open(self.fname) as f:
+                try:
+                    wpid = int(f.read())
+                except ValueError:
+                    return
+
+                try:
+                    os.kill(wpid, 0)
+                    return wpid
+                except OSError as e:
+                    if e.args[0] == errno.EPERM:
+                        return wpid
+                    if e.args[0] == errno.ESRCH:
+                        return
+                    raise
+        except OSError as e:
+            if e.args[0] == errno.ENOENT:
+                return
+            raise