3dbdfbc06f
Silently recover if REDO_CHEATFDS file descriptors are closed, because they aren't completely essential and MAKEFLAGS-related warnings already get printed if all file descriptors have been closed. If MAKEFLAGS --jobserver-auth flags are closed, improve the error message so that a) it's a normal error instead of an exception and b) we link to documentation about why it happens. Also write some more detailed documentation about what's going on here.
37 lines
875 B
Python
37 lines
875 B
Python
"""Some helper functions that don't fit anywhere else."""
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import os, errno, fcntl
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class ImmediateReturn(Exception):
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def __init__(self, rv):
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Exception.__init__(self, "immediate return with exit code %d" % rv)
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self.rv = rv
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def unlink(f):
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"""Delete a file at path 'f' if it currently exists.
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Unlike os.unlink(), does not throw an exception if the file didn't already
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exist.
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"""
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try:
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os.unlink(f)
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except OSError, e:
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if e.errno == errno.ENOENT:
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pass # it doesn't exist, that's what you asked for
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def close_on_exec(fd, yes):
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fl = fcntl.fcntl(fd, fcntl.F_GETFD)
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fl &= ~fcntl.FD_CLOEXEC
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if yes:
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fl |= fcntl.FD_CLOEXEC
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fcntl.fcntl(fd, fcntl.F_SETFD, fl)
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def fd_exists(fd):
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try:
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fcntl.fcntl(fd, fcntl.F_GETFD)
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except IOError:
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return False
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return True
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