diff options
| -rw-r--r-- | src/libutil/unix-domain-socket.cc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/libutil/unix-domain-socket.cc b/src/libutil/unix-domain-socket.cc index a9a2a415a..a6e46ca50 100644 --- a/src/libutil/unix-domain-socket.cc +++ b/src/libutil/unix-domain-socket.cc @@ -37,6 +37,17 @@ AutoCloseFD createUnixDomainSocket(const Path & path, mode_t mode) return fdSocket; } +/** + * Workaround for the max length of Unix socket names being between 102 + * (darwin) and 108 (Linux), which is extremely short. This limitation is + * caused by historical restrictions on sizeof(struct sockaddr): + * https://unix.stackexchange.com/a/367012. + * + * Our solution here is to start a process inheriting the socket, chdir into + * the directory of the socket, then connect with just the filename. This is + * rather silly but it works around working directory being process-wide state, + * and is as clearly sound as possible. + */ static void bindConnectProcHelper( std::string_view operationName, auto && operation, int fd, const std::string & path) |