File Descriptor Pool
Unix has limits on the number of concurrently open files.
PostgreSQL maintains a pool of open file descriptors:
- to hide this limitation from higher level functions
- to minimise expensive
open() operations
File names are simply strings: typedef char *FileName
Open files are referenced via: typedef int File
A File is an index into a table of "virtual file descriptors".
Defs: include/storage/fd.h
Code: backend/storage/file/fd.c
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