app/django/utils/daemonize.py
author Mario Ferraro <fadinlight@gmail.com>
Sun, 15 Nov 2009 22:12:20 +0100
changeset 3093 d1be59b6b627
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
GMaps related JS changed to use new google namespace. Google is going to change permanently in the future the way to load its services, so better stay safe. Also this commit shows uses of the new melange.js module. Fixes Issue 634.
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import os
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import sys
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if os.name == 'posix':
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    def become_daemon(our_home_dir='.', out_log='/dev/null',
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                      err_log='/dev/null', umask=022):
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        "Robustly turn into a UNIX daemon, running in our_home_dir."
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        # First fork
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        try:
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            if os.fork() > 0:
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                sys.exit(0)     # kill off parent
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        except OSError, e:
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            sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror))
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            sys.exit(1)
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        os.setsid()
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        os.chdir(our_home_dir)
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        os.umask(umask)
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        # Second fork
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        try:
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            if os.fork() > 0:
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                os._exit(0)
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        except OSError, e:
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            sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror))
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            os._exit(1)
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        si = open('/dev/null', 'r')
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        so = open(out_log, 'a+', 0)
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        se = open(err_log, 'a+', 0)
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        os.dup2(si.fileno(), sys.stdin.fileno())
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        os.dup2(so.fileno(), sys.stdout.fileno())
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        os.dup2(se.fileno(), sys.stderr.fileno())
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        # Set custom file descriptors so that they get proper buffering.
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        sys.stdout, sys.stderr = so, se
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else:
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    def become_daemon(our_home_dir='.', out_log=None, err_log=None, umask=022):
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        """
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        If we're not running under a POSIX system, just simulate the daemon
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        mode by doing redirections and directory changing.
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        """
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        os.chdir(our_home_dir)
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        os.umask(umask)
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        sys.stdin.close()
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        sys.stdout.close()
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        sys.stderr.close()
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        if err_log:
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            sys.stderr = open(err_log, 'a', 0)
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        else:
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            sys.stderr = NullDevice()
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        if out_log:
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            sys.stdout = open(out_log, 'a', 0)
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        else:
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            sys.stdout = NullDevice()
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    class NullDevice:
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        "A writeable object that writes to nowhere -- like /dev/null."
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        def write(self, s):
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            pass