close deleted file fd

close_fd.py

# gdb -ex 'set print thread-events off' --batch -q -x ~/df.py
import os
import os.path
import sys
import gdb

pid = open('/var/run/docker.pid', 'r').read()
print 'attach to ' + pid
gdb.execute('attach ' + pid)
os.chdir('/proc/%s/fd'%pid)

out=[]
for f in os.listdir('.'):
    if not os.path.islink(f):
        continue
    if '(deleted)' in os.readlink(f):
        #with open(f, 'w') as of:
        	#of.truncate(0)
        out.append(gdb.execute('call close(%d)'%int(f), to_string=True))
print len(out)
gdb.execute('detach')
gdb.execute('quit')