Technical data

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Appendix A

A. Run-Time Error Messages

Table A-1 lists possible Fortran run-time I/O errors. Other errors given by

the operating system may also occur.

Each error is listed on the screen alone or with one of the following phrases

appended to it:

apparent state: unit num named user ﬁlename

last format: string

lately (reading, writing)(sequential, direct, indexed)

formatted, unformatted(external, internal) IO

When the Fortran run-time system detects an error, the following actions

take place:

• A message describing the error is written to the standard error unit

(Unit 0).

• A core ﬁle, which can be used with dbx (the debugger) to inspect the

state of the program at termination, is produced if the f77_dump_ﬂag

environment variable is deﬁned and set to y.