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In reply to LibreSSL's PRNG is Unsafe on Linux [Update: LibreSSL fork fix]
pid_t is not 16-bits, though often the default /proc/sys/kernel/pid_max is set to a value that fits in an unsigned 16-bit number (likely to keep ancient programs working).
The value can be raised to a little more than 4 million, and on most of the systems I influence, this number is raised as otherwise busy systems run out of id's. With the limit set much higher, the chance of pid reuse is lessened, but not eliminated.
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