- Documentation
- Reference manual
- Foreign Language Interface
- The Foreign Include File
- Argument Passing and Control
- Atoms and functors
- Analysing Terms via the Foreign Interface
- Constructing Terms
- Unifying data
- Convenient functions to generate Prolog exceptions
- Serializing and deserializing Prolog terms
- BLOBS: Using atoms to store arbitrary binary data
- Exchanging GMP numbers
- Calling Prolog from C
- Discarding Data
- String buffering
- Foreign Code and Modules
- Prolog exceptions in foreign code
- Catching Signals (Software Interrupts)
- Miscellaneous
- Errors and warnings
- Environment Control from Foreign Code
- Querying Prolog
- Registering Foreign Predicates
- Foreign Code Hooks
- Storing foreign data
- Embedding SWI-Prolog in other applications
- The Foreign Include File
- Foreign Language Interface
- Packages
- Reference manual
swi.
PL_version() is provided as a macro for compatibility. Defined
keys are:
- PL_VERSION_SYSTEM
- SWI-Prolog version as 10,000 × major + 100 × minor + patch.
- PL_VERSION_FLI
- Incremented if the foreign interface defined in this chapter changes in a way that breaks backward compatibility.
- PL_VERSION_REC
- Incremented if the binary representation of terms as used by PL_record_external() and fast_write/2 changes.
- PL_VERSION_QLF
- Incremented if the QLF file format changes.
- PL_VERSION_QLF_LOAD
- Represents the oldest loadable QLF file format version.
- PL_VERSION_VM
- A hash that represents the VM instructions and their arguments.
- PL_VERSION_BUILT_IN
- A hash that represents the names, arities and properties of all built-in predicates defined in C. If this function is called before PL_initialise() it returns 0.
12.4.19 Querying Prolog
- long PL_query(int)
- Obtain status information on the Prolog system. The actual argument type depends on the information required. int describes what information is wanted.208Returning pointers and integers as a long is bad style. The signature of this function should be changed. The options are given in table 9.