PostgreSQL 7.1.3 Documentation
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# 3.13. pg_proc

This catalog stores information about functions (or procedures). The description of CREATE FUNCTION and the Programmer's Guide contain more information about the meaning of some fields.

Table 3-13. pg_proc Columns

Name | Type | References | Description
--- | --- | --- | ---
proname | `name` |  | Name of the function
proowner | `int4` | pg_shadow.usesysid | Owner (creator) of the function
prolang | `oid` | pg_language.oid | Implementation language or call interface of this function
proisinh | `bool` |  | unused
proistrusted | `bool` |  | not functional
proiscachable | `bool` |  | Function returns same result for same input values
proisstrict | `bool` |  | Function returns null if any call argument is null. In that case the function won't actually be called at all. Functions that are not "strict" must be prepared to handle null inputs.
pronargs | `int2` |  | Number of arguments
proretset | `bool` |  | Function returns a set (probably not functional)
prorettype | `oid` | pg_type.oid | Data type of the return value (0 if the function does not return a value)
proargtypes | `oidvector` | pg_type.oid | A vector with the data types of the function arguments
probyte_pct | `int4` |  | dead code
properbyte_pct | `int4` |  | dead code
propercall_pct | `int4` |  | dead code
prooutin_ratio | `int4` |  | dead code
prosrc | `text` |  | This tells the function handler how to invoke the function. It might be the actual source code of the function for interpreted languages, a link symbol, a file name, or just about anything else, depending the implementation language/call convention.
probin | `bytea` |  | ?

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