File: check-open-fds

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#!/usr/bin/env python3

import errno
import resource
import sys
import os

controlfd = int(os.environ.get("LLBUILD_CONTROL_FD"))

print(("control FD: %s" % (controlfd,)))

# Check if the given FD is valid).
def is_fd(fd):
    if fd == controlfd:
        return False;
    fd2 = None
    try:
        fd2 = os.dup(fd)
    except OSError as e:
        if e.errno != errno.EBADF:
            raise
    if fd2 is not None:
        os.close(fd2)
        return True
    return False

max_fd_soft,max_fd_hard = resource.getrlimit(resource.RLIMIT_NOFILE)
num_valid_fds = [i for i in range(max_fd_soft) if is_fd(i)]
print(("open FDs: %s" % (num_valid_fds,)))