On Wednesday 03 February 2010, Marc Olzheim <[email protected]> wrote: > On Wed, Feb 03, 2010 at 10:23:50AM -0300, Daniel Molina Wegener wrote: > > > I'm having trouble looking this function up in the source tree, the > > > trail seems to end at __sys_read which has a bunch of prototypes but i > > > can't find the actual function code. > > > > Well, you can try cscope --- IMO the best option to > > search for symbols in the source tree. Also you have > > well done front-ends like cbrowser, codelite and emacs > > plus cscope mode. > > Works wonders in vim as well. :-)
Sure, vim supports cscope since 2000 and possibly before that, indeed vim was my first programming editor in FreeBSD and Linux. Then I've learned emcas, and now I use both editors --- the first available on the machine that I'm working on --- also emacs requires a lot of configurations, but is my primary editor on my FreeBSD boxes. > > > > So my question is primarily, does getc use the read system call > > > eventually? > > > > No, certainly not. Take a look on stdio.h and libc > > implementation on lib/libc/stdio/getc.c. Mainly on the > > __sgetc(f) macro. > > If you follow macros long enough, you'll find that it obviously does use > the read system call. read, readv, pread, preadv are basicly the system > calls through which all normal reads take place. That's right, but cscope or even etags should help a lot finding those simbols, most for large source trees like the FreeBSD base system ;) > > Marc > Best regards, -- Daniel Molina Wegener <dmw [at] coder [dot] cl> Software Architect, System Programmer & Web Developer Phone: +1 (510) 629-4267 | Blog: http://coder.cl/
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