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Add SSHMaster::Connection::trySetBufferSize

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It is unused in Nix currently, but will be used in Hydra. This reflects
what Hydra does in https://github.com/NixOS/hydra/pull/1387.

We may probably to use it more widely for better SSH store performance,
but this needs to be subject to more testing before we do that.
This commit is contained in:
John Ericson 2024-05-23 11:53:17 -04:00
parent f0dbfada38
commit 0d25cc6541
2 changed files with 27 additions and 0 deletions
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15
src/libstore/ssh.cc
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@ -240,4 +240,19 @@ Path SSHMaster::startMaster()
#endif
void SSHMaster::Connection::trySetBufferSize(size_t size)
{
#ifdef F_SETPIPE_SZ
/* This `fcntl` method of doing this takes a positive `int`. Check
and convert accordingly.
The function overall still takes `size_t` because this is more
portable for a platform-agnostic interface. */
assert(size <= INT_MAX);
int pipesize = size;
fcntl(in.get(), F_SETPIPE_SZ, pipesize);
fcntl(out.get(), F_SETPIPE_SZ, pipesize);
#endif
}
}