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The next example is a little less trivial:
6566 nodev ()
{
u.u_error = ENODEV;
}
The additional statement is an assignment statement. It is terminated by a semicolon which is part of the statement, not a statement separator as in Algol-like languages.
“ENODEV” is a defined symbol, i.e. a symbol which is replaced by an associated character string by the compiler preprocessor before actual compilation. “ENODEV” is defined on line 0484 as 19. The UNIX convention is that defined symbols are written in upper case, and all other symbols in lower case.
“=” is the assignment operator, and “u.u_error” is an element of the structure “u”. (See line 0419.) Note the use of “.” as the operator which selects an element of a structure. The element name is “u_error” which may be taken as a paradigm for the way names of structure elements are constructed in the UNIX source code: a distinguishing letter is followed by an underscore followed by a name.
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