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- Unistd.h abstract "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. It is defined by the POSIX.1 standard, the base of the Single Unix Specification, and should therefore be available in any conforming (or quasi-conforming) operating system/compiler (all official versions of UNIX, including Mac OS X, GNU/Linux, etc.).On Unix-like systems, the interface defined by unistd.h is typically made up largely of system call wrapper functions such as fork, pipe and I/O primitives (read, write, close, etc.).Unix compatibility layers such as Cygwin and MinGW also provide their own versions of unistd.h. In fact, those systems provide it along with the translation libraries that implement its functions in terms of Win32 functions. E.g. In Cygwin, a header file can be found in /usr/include that sub-includes a file of the same name in /usr/include/sys. Not everything is defined in there but some definitions are done by references to the GNU C standard library headers (like stddef.h) which provide the type size_t and many more. Thus, unistd.h is only a generically defined adaptive layer that might be based upon already existing system and compiler specific definitions. This has the general advantage of not having a possibly concurrent set of header file defined, but one that is built upon the same root which, for this reason, will raise much fewer concerns in combined usage cases.".
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- Unistd.h subject Category:C_POSIX_library.
- Unistd.h subject Category:C_headers.
- Unistd.h type Abstraction100002137.
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- Unistd.h comment "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.".
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