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25 lines
549 B
Python
25 lines
549 B
Python
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"""When called as a script, print a comma-separated list of the open
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file descriptors on stdout."""
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import errno
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import os
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import fcntl
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try:
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_MAXFD = os.sysconf("SC_OPEN_MAX")
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except:
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_MAXFD = 256
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def isopen(fd):
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"""Return True if the fd is open, and False otherwise"""
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try:
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fcntl.fcntl(fd, fcntl.F_GETFD, 0)
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except IOError as e:
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if e.errno == errno.EBADF:
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return False
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raise
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return True
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if __name__ == "__main__":
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print(','.join(str(fd) for fd in range(0, _MAXFD) if isopen(fd)))
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