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Top Forums UNIX for Dummies Questions & Answers Are programs like sys_open( ) ,sys_read( ) et al examples of system level programs ? Post 302365387 by vishwamitra on Tuesday 27th of October 2009 09:22:37 PM
Old 10-27-2009
Are programs like sys_open( ) ,sys_read( ) et al examples of system level programs ?

Are the programs written on schedulers ,thread library , process management, memory management, et al called systems programs ? How are they different from the programs that implement functions like open() , printf() , scanf() , read() .. they have a prefix sys_open, sys_close, sys_read etc , right ? Is there any difference of hierarchy between the programs that implement system calls and system level programs like that implement thread library, process management , memory managemnt etc..
Hope you understood my qstn

---------- Post updated 10-27-09 at 09:22 PM ---------- Previous update was 10-26-09 at 11:01 PM ----------

I got this cleared ..Here goes the clarification
" Functions like open() , printf() , scanf() , read() are library function implemented on top of their sys_* counterparts so they can be used for any Application development. On the other hand sys_open, sys_close, sys_read etc are implemented as-part-of-system commonly known as kernel. On top of this, system programs like thread library, compilers, linkers are implemented which helps other application development. Hope this clears the difference between system, system programs and application programs. "
 

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ATF(7)						       BSD Miscellaneous Information Manual						    ATF(7)

NAME
ATF -- introduction to the Automated Testing Framework DESCRIPTION
The Automated Testing Framework (ATF) is a collection of libraries to implement test programs in a variety of languages. These libraries all offer similar functionality and any test program written with them exposes a consistent user interface. Test programs using the ATF libraries rely on a separate runtime engine to execute them in a deterministic fashion. The runtime engine iso- lates the test programs from the rest of the system and ensures some common side-effects are cleaned up. The runtime engine is also respon- sible for gathering the results of all tests and composing reports. The current runtime of choice is Kyua, described in kyua(1). If your operating systems distributes ATF, it should also provide an introductory tests(7) manual page. You are encouraged to read it now. The rest of this manual page serves as a cross-reference to all the other documentation shipped with ATF. Language bindings atf-c(3) C programming interface. atf-c++(3) C++ programming interface. atf-sh(3) sh(1) programming interface. Miscellaneous pages atf-test-case(4) Generic description of test cases, independent of the language they are implemented in. atf-test-program(1) Common interface provided by the test programs written using the ATF libraries. SEE ALSO
kyua(1), tests(7) HISTORY
ATF started as a Google Summer of Code 2007 project mentored by The NetBSD Foundation. Its original goal was to provide a testing framework for the NetBSD operating system, but it grew as an independent project because the framework itself did not need to be tied to a specific operating system. Originally, ATF shipped the collection of libraries described in this manual page as well as a runtime engine. The runtime engine has since been replaced by Kyua and the old tools were removed in 0.20, which shipped in early 2014. As of late 2014, both FreeBSD and NetBSD ship ATF in their base systems and provide extensive test suites based on it. For more details on historical changes, refer to: /usr/share/doc/atf/NEWS AUTHORS
For more details on the people that made ATF possible, refer to: /usr/share/doc/atf/AUTHORS BSD
September 14, 2014 BSD
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