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File exists EXDEV: 18: Invalid cross-device link ENODEV: 19: No such device ENOTDIR: 20: Not a directory EISDIR: 21: Is a directory EINVAL: 22: Invalid argument ENFILE: 23: Too many open files in system EMFILE: 24: Too many open files ENOTTY: 25: Inappropriate ioctl for device ETXTBSY: 26: Text file busy EFBIG: 27: File too large ENOSPC: 28: No ...
More generally, Python 2.x specifies the built-in file objects as being “implemented using C's stdio package," [48] and frequent reference is made to C standard library behaviors; the available operations (open, read, write, etc.) are expected to have the same behavior as the corresponding C functions (fopen, fread, fwrite, etc.).
Most of the functions that operate on C strings are declared in the string.h header (cstring in C++), while functions that operate on C wide strings are declared in the wchar.h header (cwchar in C++). These headers also contain declarations of functions used for handling memory buffers; the name is thus something of a misnomer.
This directive, inserted at the top of a header file, will ensure that the file is included only once. The Objective-C language (which is a superset of C) has an #import directive, which works exactly like #include , except that it includes each file only once, thus obviating the need for #include guards.
Using #pragma once allows the C preprocessor to include a header file when it is needed and to ignore an #include directive otherwise. This has the effect of altering the behavior of the C preprocessor itself, and allows programmers to express file dependencies in a simple fashion, obviating the need for manual management.
The term "function prototype" is particularly used in the context of the programming languages C and C++ where placing forward declarations of functions in header files allows for splitting a program into translation units, i.e. into parts that a compiler can separately translate into object files, to be combined by a linker into an executable ...
One-character variable names should be avoided except for temporary "throwaway" variables. Common names for temporary variables are i, j, k, m, and n for integers; c, d, and e for characters. int i; char c; float myWidth; Constants Constants should be written in SCREAMING_SNAKE_CASE. Constant names may also contain digits if appropriate, but ...
The alternative is an unqualified file name or a partially qualified file name. On Unix-style systems, DOS, and Microsoft Windows, the name "sample" refers to a file in the current directory named "sample". If the current directory is changed, then the file referred to by the name "sample" is different.