using ftw()

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1. Programming

find depth using ftw

Hello, I am looking for specific files in my tree directory using ftw(3). How do I know how deep I am in the file structure.. in other words, say I am looking for config.txt files, and my structure looks like this.. /some/directory/user1/config.txt /some/directory/user2/config.txt .......

2. Programming

ftw/nftw -- filesystem tree walk

Hi, I recently experimented with ftw() and nftw(). These are function for calling some function for every file in a subtree. I need to get full information about type of file. Almost everything is working according to documentation but I noticed following problem: With a value FTW_PHYS...

3. Programming

ftw function

int ftw(const char *path, int(*func)(), int depth); what does the third parameter(depth) mean? the book said that the larger the value of depth, the fewer directories have to be reopened, therefore increasing the speed of the call. how so? thanks

LEARN ABOUT POSIX

ftw.h

<ftw.h>(P)						     POSIX Programmer's Manual							<ftw.h>(P)

NAME

       ftw.h - file tree traversal

SYNOPSIS

       #include <ftw.h>

DESCRIPTION

       The <ftw.h> header shall define the FTW structure that includes at least the following members:

	      int  base
	      int  level

       The  <ftw.h>  header shall define macros for use as values of the third argument to the application-supplied function that is passed as the
       second argument to ftw() and nftw():

       FTW_F  File.

       FTW_D  Directory.

       FTW_DNR
	      Directory without read permission.

       FTW_DP Directory with subdirectories visited.

       FTW_NS Unknown type; stat() failed.

       FTW_SL Symbolic link.

       FTW_SLN
	      Symbolic link that names a nonexistent file.

       The <ftw.h> header shall define macros for use as values of the fourth argument to nftw():

       FTW_PHYS
	      Physical walk, does not follow symbolic links. Otherwise, nftw() follows links but does not walk down any path that crosses itself.

       FTW_MOUNT
	      The walk does not cross a mount point.

       FTW_DEPTH
	      All subdirectories are visited before the directory itself.

       FTW_CHDIR
	      The walk changes to each directory before reading it.

       The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

	      int ftw(const char *, int (*)(const char *, const struct stat *,
		  int), int);
	      int nftw(const char *, int (*)(const char *, const struct stat *,
		  int, struct FTW*), int, int);

       The <ftw.h> header shall define the stat structure and the symbolic names for st_mode and  the  file  type  test  macros  as  described	in
       <sys/stat.h> .

       Inclusion of the <ftw.h> header may also make visible all symbols from <sys/stat.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <sys/stat.h> , the System Interfaces volume of IEEE Std 1003.1-2001, ftw(), nftw()

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								<ftw.h>(P)

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