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The C function strerror returns an error description string, as detailed here. Example string
No such file or directory
The question is where are these strings defined? I looked through my header files and did not see anything.
They’re defined somewhere in the C library, traditionally in a global array of
char*calledsys_errlistof lengthsys_nerr, at least on Unix systems.Because legacy programs, written before
strerrorwas standardized, may access this array directly, it’s still available even on modern GNU/Linux and Mac OS X for backward compatibility (though you really shouldn’t access it except throughperrororstrerror).E.g, here’s the Mac OS X 10.8.2 definition of
sys_errlist.