CIGAL Reference Manual, Chapter 6 (RealTime): r_fopen
r_fopen -- Open a file for reading or writing
usage: r_fopen opflg eflag ltime Filename Lunit [Writeflag Asyncflag]
R_FOPEN is a REALTIME operator. It opens the named file and assigns it a channel reference number; this reference number is returned in the LUNIT argument. If no LUNIT is specified then the file is assigned to channel 1 by default.
The file is opened for reading by default. If WRITEFLAG is non-zero the file can also be written to. If ASYNCFLAG is specified and non-zero this command starts the operation and returns without waiting for completion; the default is to wait until the entire operation has completed.
Note 1: If no free channel is found or if there is an error in opening the file LUNIT is set to 0.
Note 2: Although this operator appears to function synchronously, it actually involves asynchronous file operations; this allows other REALTIME processing streams to continue while R_FOPEN awaits completion.
See Also:
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