Kernel programming sys_creat


 
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Old 05-15-2012
Kernel programming sys_creat

Hi there

At first.
My Name is Andre, 27 and im from germany

Im tryin to learn something about the Unix Kernel and System

At first im trying to manipulate the systemcalls

I want to have an Entry in the kernel logfile, whenever a new file is created.

I found out, that a file uses the sys_creat function, to be created.
This function is referencing to the sys_open

But here is the point, where i dont get any further..

Where exactly can i find this function?

I hope that my english is good enough, that you can understand my problem Smilie

Andre

---------- Post updated at 08:05 AM ---------- Previous update was at 07:12 AM ----------

edit: It seems, that the function can be foun in fs/open.c?
line: 927
if (flags & O_CREAT) {
op->intent |= LOOKUP_CREATE;

i guess, here we have the point?
can someone explain that to me?
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TWIG(1) 						      General Commands Manual							   TWIG(1)

NAME
twig - tree-manipulation language SYNOPSIS
twig [ -sASC ] [ -w suffix ] file.mt DESCRIPTION
Twig converts a tree-specification scheme consisting of pattern-action rules with associated costs into C functions that can be called to manipulate input trees. The C functions first find a minimum-cost covering of an input tree using a dynamic programming algorithm and then execute the actions associated with the patterns used in the covering. The tree-specification scheme may allow several coverings for an input tree, but the dynamic programming algorithm resolves any ambiguities by selecting a cheapest covering. The input file containing the tree-specification scheme must have the suffix Twig produces two output files: walker.c, which becomes the source file for the tree matcher, and symbols.h, which contains the definitions for the node and label symbols used in the source file. To build walker.c, twig uses an internal template file, by default one appropriate for use with fprintf(2). The options are -A Use a template file for ANSI/POSIX source files. -C Use a template file for files that use libc's print(2) routines. -S Use a template file for files that use fprintf(2). -s Do not produce a symbols.h file. -w suffix Use the template file /sys/lib/twig/walker.suffix. FILES
/sys/lib/twig System area for template files. SOURCE
/sys/src/cmd/twig SEE ALSO
yacc(1) S. W. K. Tjiang, ``The Twig Reference Manual'', Computing Science Technical Report No. 120, AT&T Bell Laboratories, Murray Hill, N.J. A. V. Aho, M. Ganapathi, and S. W. K. Tjiang, ``Code generation using tree matching and dynamic programming.'' BUGS
When tree matching fails, the debugging output is cryptic. TWIG(1)