BS2000 file processing

Besides POSIX files, the following types of files can be processed with the I/O functions of the Common Runtime Environment CRTE:

• the BS2000 system files SYSDTA, SYSOUT and SYSLST

• cataloged disk files with access methods SAM, ISAM and PAM

• temporary PAM files (INCORE).

In C-BS2000, a distinction is made between binary files and text files on one hand, and between stream-oriented and record-oriented I/O on the other.

The following table shows the possible combinations in which the various file types can be processed:

	Text file Stream I/O	Binary file Stream I/O	Binary file Record I/O
System files	X
INCORE		X
SAM	X	X	X
ISAM	X		X
PAM		X	X

A maximum of 256 files (including stdin, stdout and stderr) may be open at one time.