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58 lines
1.9 KiB
58 lines
1.9 KiB
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
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