Wladimir J. van der Laan 82dd7195e1 rpc: Write authcookie atomically
Use POSIX rename atomicity at the `bitcoind` side to create a working
cookie atomically:

- Write `.cookie.tmp`, close file
- Rename `.cookie.tmp` to `.cookie`

This avoids clients reading invalid/partial cookies as in #11129.
2017-08-25 15:37:24 +02:00
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2017-08-25 15:37:24 +02:00
2017-08-25 15:37:24 +02:00