Edge Case: Generating a C Bridge File for Custom Signal Handling

Business Context

An engineering team is integrating a legacy C simulation library that is known to be unstable and can cause segmentation faults. They need to use the `addPrototypes` action to generate a C bridge file with custom signal handling (`bridgeCatchSignals=TRUE`) to trap potential crashes and allow for graceful error reporting within CAS.

About the Set : fcmpact

Execution of SAS FCMP functions within the CAS environment.

Discover all actions of fcmpact

Data Preparation

This test does not require a data step. It focuses on the file generation capability of the action. We will define a prototype for a potentially unstable function, `run_legacy_simulation`, and instruct the action to generate the C bridge file on the CAS server's file system.

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1	/* No
2	data step required. The test validates file generation on the CAS controller. */

Étapes de réalisation

Execute `addPrototypes` with the `bridgeFile` parameter to specify an output path for the C source file and set `bridgeCatchSignals` to `TRUE`.

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1	PROC CAS;
2	fcmpact.addPrototypes
3	routineCode={"proto run_legacy_simulation(int, double) returns int;"},
4	package="LegacySim",
5	bridgeFile="/cas/data/legacy_sim_bridge.c",
6	bridgeCatchSignals=true,
7	funcTable={name="sim_protos", caslib="casuser", replace=true};
8	RUN;
9	QUIT;

Conceptual: Attempt to run the action again targeting a read-only path to test error handling. The status code should be captured and checked.

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1	/* Conceptual Step: This would test error handling if we could make the path read-only. */
2	PROC CAS;
3	fcmpact.addPrototypes
4	routineCode={"proto another_func() returns int;"},
5	package="LegacySim",
6	bridgeFile="/read_only_path/another_bridge.c",
7	funcTable={name="sim_protos_fail", caslib="casuser", replace=true} STATUS=rc;
8	RUN;
9	PRINT rc;
10	QUIT;

Expected Result

Step 1 should successfully create the `sim_protos` table and, more importantly, generate a C source file named `legacy_sim_bridge.c` at the specified server path `/cas/data/`. The log should confirm the file creation. The generated C code within that file should contain signal handling logic (e.g., for SIGSEGV) because `bridgeCatchSignals` was true. Step 2 is expected to fail, with the `status` parameter `rc` containing a non-zero error code and the log detailing a file system or permission error, proving the action's error handling robustness.

Voir la documentation technique de addPrototypes