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In the C standard library, the character reading functions such as getchar return a value equal to the symbolic value (macro) EOF to indicate that an end-of-file condition has occurred. The actual value of EOF is implementation-dependent and must be negative (but is commonly −1, such as in glibc [ 2 ] ).
In contrast, the Control-D causes the Unix terminal driver to signal the EOF condition, which is not a character, while the byte has no special meaning if actually read or written from a file or terminal. In Unix, the end-of-file character (by default EOT) causes the terminal driver to make available all characters in its input buffer ...
The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.
However, typing Control+Z does not embed an EOF character into a file in either DOS or Windows, nor do the APIs of those systems use the character to denote the actual end of a file. Some programming languages (e.g. Visual Basic) will not read past a "soft" EOF when using the built-in text file reading primitives (INPUT, LINE INPUT etc ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 10 January 2025. General-purpose programming language "C programming language" redirects here. For the book, see The C Programming Language. Not to be confused with C++ or C#. C Logotype used on the cover of the first edition of The C Programming Language Paradigm Multi-paradigm: imperative (procedural ...
For most file systems, a program terminates access to a file in a filesystem using the close system call. This flushes file buffers, updates file metadata , which may include and end-of-file indicator in the data; de-allocates resources associated with the file (including the file descriptor ) and updates the system wide table of files in use.
Control-C is often used to interrupt a program or process, a standard that started with Dec operating systems. [ citation needed ] In TOPS-20 , it was used to gain the system's attention before logging in. mIRC uses ETX as the escape character to start a command to set the color.
End-of-file, a condition where no more data can be read from a data source; Enterprise Objects Framework, a NeXT object-relational mapping product; EoF, a song editing program for the free Guitar Hero clone Frets on Fire; Ethereum Object Format, an object container standard specifying header, code, data, types