Path: utzoo!utgpu!watmath!iuvax!purdue!mentor.cc.purdue.edu!dls
From: dls@mentor.cc.purdue.edu (David L. Stevens)
Newsgroups: comp.bugs.4bsd
Subject: stealth technology for find(1)
Keywords: atimes, utimes(2), find(1)
Message-ID: <3584@mentor.cc.purdue.edu>
Date: 8 Aug 89 04:13:10 GMT
Organization: PUCC UNIX Group
Lines: 68

Index:	/usr/src/usr.bin/find/find.c 4.3BSD

Description:
	find(1) changes atimes for all directories it searches, which makes
the "-atime" predicate less useful. The find(1) itself changes the directory
access times so they never age.

Repeat-By:
	find / -atime ...

Fix:
	Save the utimes for directories before reading them and restore them
on the way back up.  (Works for root or directory owners, only) Diffs follow:

*** NEW find.c	Mon Aug  7 22:33:48 1989
--- OLD find.c	Mon Aug  7 22:30:29 1989
***************
*** 6,11 ****
--- 6,14 ----
  #include <sys/param.h>
  #include <sys/dir.h>
  #include <sys/stat.h>
+ #ifdef	STEALTH
+ #include <sys/time.h>
+ #endif	/* STEALTH */
  
  #define A_DAY	86400L /* a day full of seconds */
  #define EQ(x, y)	(strcmp(x, y)==0)
***************
*** 665,670 ****
--- 668,676 ----
  	char *endofname;
  	auto char sbkeep_dir[MAXPATHLEN+MAXNAMLEN+2];
  	struct stat lstatb;
+ #ifdef	STEALTH
+ 	struct	timeval	tvp[2];
+ #endif	/* STEALTH */
  
  	if ((follow?stat(fname, &Statb):lstat(fname, &Statb))<0) {
  		fprintf(stderr, "find: bad status < %s >\n", name);
***************
*** 699,704 ****
--- 705,714 ----
  
  	if (chdir(fname) == -1)
  		return(0);
+ #ifdef	STEALTH
+ 	tvp[0].tv_sec = Statb.st_atime;
+ 	tvp[1].tv_sec = Statb.st_mtime;
+ #endif	/* STEALTH */
  	if ((dir = opendir(".")) == NULL) {
  		fprintf(stderr, "find: cannot open < %s >\n", name);
  		rv = 0;
***************
*** 725,730 ****
--- 735,743 ----
  ret:
  	if(dir)
  		closedir(dir);
+ #ifdef	STEALTH
+ 	(void) utimes(".", tvp);
+ #endif	/* STEALTH */
  	if (chdir(*sbkeep_dir ? sbkeep_dir : "..") == -1) {
  		*endofname = '\0';
  		fprintf(stderr, "find: bad directory <%s>\n", name);

-- 
					+-DLS  (dls@mentor.cc.purdue.edu)