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these functions are allowed to be cancellation points, but then we
would have to install cleanup handlers to avoid termination with locks
held.
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with datagram sockets, depending on fprintf not to flush the output
early was very fragile; the new version simply uses a small fixed-size
buffer. it could be updated to dynamic-allocate large buffers if
needed, but i can't envision any admin being happy about finding
64kb-long lines in their syslog...
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per the standard, SIGPIPE is not generated for SOCK_DGRAM.
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it actually appears the hacks to block SIGPIPE are probably not
necessary, and potentially harmful. if i can confirm this, i'll remove
them.
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