forked from Lainports/freebsd-ports
ee4ef808b3
libusb now) PR: ports/117250 Submitted by: Anish Mistry <amistry@am-productions.biz> (maintainer)
53 lines
2.3 KiB
Python
53 lines
2.3 KiB
Python
--- base/utils.py.orig Wed Oct 10 00:23:07 2007
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+++ base/utils.py Wed Oct 10 00:27:04 2007
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@@ -54,6 +54,50 @@
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return callable
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+# For pidfile locking (must be "static" and global to the whole app)
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+prv_pidfile = None
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+prv_pidfile_name = ""
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+
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+def get_pidfile_lock (a_pidfile_name=""):
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+ """ Call this to either lock the pidfile, or to update it after a fork()
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+ Credit: Henrique M. Holschuh <hmh@debian.org>
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+ """
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+ global prv_pidfile
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+ global prv_pidfile_name
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+ if prv_pidfile_name == "":
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+ try:
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+ prv_pidfile_name = a_pidfile_name
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+ prv_pidfile = os.fdopen(os.open(prv_pidfile_name, os.O_RDWR | os.O_CREAT, 0644), 'r+')
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+ fcntl.fcntl(prv_pidfile.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
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+ while 1:
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+ try:
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+ fcntl.flock(prv_pidfile.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
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+ except (OSError, IOError), e:
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+ if e.errno == errno.EINTR:
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+ continue
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+ elif e.errno == errno.EWOULDBLOCK:
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+ try:
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+ prv_pidfile.seek(0)
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+ otherpid = int(prv_pidfile.readline(), 10)
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+ sys.stderr.write ("can't lock %s, running daemon's pid may be %d\n" % (prv_pidfile_name, otherpid))
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+ except (OSError, IOError), e:
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+ sys.stderr.write ("error reading pidfile %s: (%d) %s\n" % (prv_pidfile_name, e.errno, e.strerror))
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+
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+ sys.exit(1)
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+ sys.stderr.write ("can't lock %s: (%d) %s\n" % (prv_pidfile_name, e.errno, e.strerror))
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+ sys.exit(1)
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+ break
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+ except (OSError, IOError), e:
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+ sys.stderr.write ("can't open pidfile %s: (%d) %s\n" % (prv_pidfile_name, e.errno, e.strerror))
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+ sys.exit(1)
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+ try:
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+ prv_pidfile.seek(0)
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+ prv_pidfile.write("%d\n" % (os.getpid()))
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+ prv_pidfile.flush()
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+ prv_pidfile.truncate()
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+ except (OSError, IOError), e:
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+ log.error("can't update pidfile %s: (%d) %s\n" % (prv_pidfile_name, e.errno, e.strerror))
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+
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def daemonize (stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
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"""
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Credit: Jürgen Hermann, Andy Gimblett, and Noah Spurrier
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