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In the C and C++ programming languages, unistd.h is the name of the header file that provides access to the POSIX operating system API. [1] It is defined by the POSIX.1 standard, the base of the Single Unix Specification , and should therefore be available in any POSIX-compliant operating system and compiler .
Another solution is to use an include guard in each header file. [4] The C standard library is declared as a collection of header files. The C++ standard library is similar, but the declarations may be provided by the compiler without reading an actual file. C standard header files are named with a .h file name extension, as in #include <stdio ...
<poll.h> Asynchronous file descriptor multiplexing: Issue 4 <pthread.h> Defines an API for creating and manipulating POSIX threads: Issue 5 <pwd.h> passwd (user information) access and control: Issue 1 <regex.h> Regular expression matching: Issue 4 <sched.h> Execution scheduling: Issue 5 <search.h> Search tables: Issue 1 <semaphore.h> POSIX ...
direct.h is a C/C++ header file provided by Microsoft Windows, which contains functions for manipulating file system directories. Some POSIX functions that do similar things are in unistd.h . Member functions
This suggests that unistd.h is part of the C or C++ language standards when actually it's part of the POSIX standards. To fix this, I would turn it around: > On POSIX operating systems, unistd.h is the name of the header file that provides system API declarations to programs written in the C or C++ programming languages.
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. [3]
In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.
The related system call fsync() commits just the buffered data relating to a specified file descriptor. [1] fdatasync() is also available to write out just the changes made to the data in the file, and not necessarily the file's related metadata. [2] Some Unix systems run a kind of flush or update daemon, which calls the sync function on a ...