On Wed, Jan 10, 2018 at 8:29 PM, bin.w...@qkmtech.com <bin.w...@qkmtech.com> wrote: > think you very much. > > as you said: > >>POSIX and ISO-C tend to go together. >>With RTEMS, you can also use ISO-C with the "Classic API", which >>consists of interface functions accessible from C programs as >>described in the "C User Guide". > > Does it mean that i can just use ISO-c? so ,i think I do not need care > about posix API because i think i use the classic api is enough for me . > is it right? > Sure.
>>Most new development and ports of existing software probably use POSIX >>anyway, except for the simplest applications. This configure option >>was provided historically as a way to avoid compiling the POSIX >>library into an application, but modern compilers are able to remove >>the unused code any way. > > i think i understand what you said in this part . if i use the --enable > posix in the configure , but i do not use the posix api, then ,the compiler > will not use the unused code . > Correct. > thanks > ________________________________ > bin.w...@qkmtech.com > > > From: Gedare Bloom > Date: 2018-01-11 00:50 > To: bin.w...@qkmtech.com > CC: Chris Johns; Users > Subject: Re: Re: the difference between posix user and c user > On Thu, Dec 28, 2017 at 9:35 PM, bin.w...@qkmtech.com > <bin.w...@qkmtech.com> wrote: >> is the posix api and the c api used together? >> > POSIX and ISO-C tend to go together. > > With RTEMS, you can also use ISO-C with the "Classic API", which > consists of interface functions accessible from C programs as > described in the "C User Guide". > >> sorry . i am also confused about this two things . because i find that >> when >> i config the rtems kernel ,there is a option which is --enable posix. >> > Most new development and ports of existing software probably use POSIX > anyway, except for the simplest applications. This configure option > was provided historically as a way to avoid compiling the POSIX > library into an application, but modern compilers are able to remove > the unused code any way. > >> ________________________________ >> bin.w...@qkmtech.com >> >> >> From: bin.w...@qkmtech.com >> Date: 2017-12-29 09:25 >> To: Chris Johns; Users >> Subject: Re: Re: the difference between posix user and c user >> i google the posix .now i know that posix is the abbreviation of "the >> Portable Operating System Interface" it is for software compatibility with >> variants of Unix and other operating systems >> >> but you said, "POSIX and the Classic API are both C APIs." >> than i think the posix is packaged on the basis of the standard C, is it >> right ? >> the classic api is the standard c interface , is it right? >> >> best wishes >> >> ________________________________ >> bin.w...@qkmtech.com >> >> >> From: Chris Johns >> Date: 2017-12-29 02:18 >> To: users >> Subject: Re: the difference between posix user and c user >> On 29/12/17 12:00 am, bin.w...@qkmtech.com wrote: >>> hi everyone: >>> >>> i am new to linux and rtems. i do not understand >>> what the difference between posix user and c user . >>> >>> i am confused about these two concept. which condition i should choose >>> posix ? >>> which condition i should choose c ? >>> >> >> This is a good question and it is understandable why you do not understand >> the >> difference. The reason is specific to RTEMS and relates to it's history. >> >> The original RTEMS was written in Ada and C and the C API is what we now >> call >> the Classic API. It's manual was called the C User Guide hence the name. >> >> The Ada version of RTEMS was removed from the source tree and POSIX came a >> while >> later. >> >> POSIX and the Classic API are both C APIs. The C User manual is now called >> the >> RTEMS Classic API Guide. See: >> >> https://docs.rtems.org/ >> >> Chris >> _______________________________________________ >> users mailing list >> users@rtems.org >> http://lists.rtems.org/mailman/listinfo/users >> >> >> _______________________________________________ >> users mailing list >> users@rtems.org >> http://lists.rtems.org/mailman/listinfo/users > _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
