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FIDL internal library zx

The zx library is is defined by //zircon/vdso/zx_common.fidl. It is included by GN build rules into invocations of fidlc when building fidl code and need not be explicitly depended upon by every fidl library. If invoking fidlc directly, zx_common.fidl would need to be included with a --files argument if necessary.

You can reference this library with the using statement:

using zx;

The types generally correspond to Zircon System Types. For example, zx.duration corresponds to zx_duration_t.

The CHANNEL_MAX_MSG_BYTES and CHANNEL_MAX_MSG_HANDLES are bound at fidlc compile time (that is, when the compiler is compiled) and reflect the constants present at that time.