m_FileAssign assigns a file. If assigning a file triggers the creation of a file, the creation process precedes the assign itself.

Specific cases are:

• New files (DISP=NEW parameter).
• Concatenated files (DD cards, where only the first one contains a label). In this case a concatenation is made in a temporary file, the original DSNAME is replaced by the name of the temporary file.
• Override files (file override in the JCL); a specific assign function m_FileOverride is used. This function call is implanted in each STEP required, before the execution of the program.
• In the case where a file assign contains a DISP=NEW,DELETE,DELETE parameter, a delete process is added to the end (normal and abnormal) of the step.
• For the DISP=OLD and DISP=PASS options, the file is kept.
• For the DISP=MOD option, the write to the file is made in a temporary intermediary file, then by a copy in Extend on the original file.
• In one step, if a DDNAME is defined more than one time by m_FileAssign, only the first one takes effect. The disposition specified for the former DSNAME is also discarded.