Fortran iostat integer codes

November 30, 2023

Fortran I/O operations like read() and write() have an optional iostat argument that can be used to capture error codes rather than stopping the program. Fortran iostat integer non-zero error codes don’t have standard values across compilers. Functions like is_iostat_end() allow standard identification of end-of-file conditions across compilers.

There generally aren’t tables published of compiler-specific iostat codes, besides the source code of the compiler itself. Intel oneAPI iostat integer codes are shared with other conditions in the Intel Fortran runtime library.