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efadf11660
The native C ABI only works in-process. This example demonstrates the other half — the CBOR ABI crossing a process (and machine) boundary — since the `ctx` pointer is process-local and cannot travel over the wire. A server links libmy_timer, owns one context, and serves method calls; a client links nothing (it only needs the FfiCbor encoder/ffi_decode_text in my_timer_cbor.h) and speaks the same CBOR over a socket. Both binaries accept `--unix <path>` for two processes on one host and `--tcp <host> <port>` for two machines — the only difference is the socket family, so one client/server pair covers both scenarios. Framing is length-prefixed in network byte order so the endpoints may differ in OS, arch, or endianness. `proto.h` carries the shared framing, the CBOR request builders, and a small CBOR map reader so the client can pull text fields out of a response without a full CBOR library. Verified end-to-end over both AF_UNIX and TCP loopback. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
55 lines
1.8 KiB
Makefile
55 lines
1.8 KiB
Makefile
# Build the IPC (CBOR-over-socket) timer example.
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#
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# make # build the Nim dylib, the server, and the client
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# make demo # run a full same-machine round-trip over a unix socket
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# make clean
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#
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# The server links libmy_timer; the client does not (it only needs the CBOR
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# encoder/decoder in my_timer_cbor.h). The Nim library is compiled from the
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# repository root so its vendored Nimble dependencies resolve.
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# Generated my_timer.h / my_timer_cbor.h live in ../c_bindings.
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REPO_ROOT := $(abspath ../../..)
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NIM_SRC := $(REPO_ROOT)/examples/timer/timer.nim
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HDR_DIR := ../c_bindings
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UNAME_S := $(shell uname -s)
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ifeq ($(UNAME_S),Darwin)
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LIBNAME := libmy_timer.dylib
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RPATH := -Wl,-rpath,.
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else
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LIBNAME := libmy_timer.so
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RPATH := -Wl,-rpath,'$$ORIGIN'
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endif
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CC ?= cc
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# proto.h is a shared static-inline header; each TU uses a subset of it, so
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# unused-function warnings are expected and silenced.
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CFLAGS ?= -std=c11 -Wall -Wextra -Wno-unused-function -O2 -I. -I$(HDR_DIR)
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NIMFLAGS := --mm:orc -d:chronicles_log_level=WARN --app:lib --noMain \
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--nimMainPrefix:libmy_timer
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SOCK := /tmp/my_timer.sock
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.PHONY: all demo clean
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all: server client
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$(LIBNAME):
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cd $(REPO_ROOT) && nim c $(NIMFLAGS) -o:$(CURDIR)/$(LIBNAME) $(NIM_SRC)
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server: server.c proto.h $(HDR_DIR)/my_timer_cbor.h $(LIBNAME)
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$(CC) $(CFLAGS) server.c -L. -lmy_timer -lpthread $(RPATH) -o server
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client: client.c proto.h $(HDR_DIR)/my_timer_cbor.h
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$(CC) $(CFLAGS) client.c -o client
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# Same-machine demo: start the server on a unix socket, run the client, stop.
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demo: all
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@./server --unix $(SOCK) & echo $$! > .srv.pid; \
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sleep 1; \
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./client --unix $(SOCK); \
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kill `cat .srv.pid` 2>/dev/null; rm -f .srv.pid $(SOCK)
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clean:
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rm -f server client $(LIBNAME) .srv.pid $(SOCK)
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