touch 修订：可以修改链接文件的时间

--- usr.bin/touch/touch.c.orig	Sun Jul 28 14:52:15 2002
+++ usr.bin/touch/touch.c	Tue Mar 15 13:34:14 2005
@@ -133,22 +133,23 @@
 
 	for (rval = 0; *argv; ++argv) {
 		/* See if the file exists. */
-		if (stat(*argv, &sb)) {
-			if (!cflag) {
-				/* Create the file. */
-				fd = open(*argv,
-				    O_WRONLY | O_CREAT, DEFFILEMODE);
-				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
-					rval = 1;
-					warn("%s", *argv);
-					continue;
-				}
+		if (lstat(*argv, &sb))
+			if (stat(*argv, &sb)) {
+				if (!cflag) {
+					/* Create the file. */
+					fd = open(*argv,
+					    O_WRONLY | O_CREAT, DEFFILEMODE);
+					if (fd == -1 || fstat(fd, &sb) || close(fd)) {
+						rval = 1;
+						warn("%s", *argv);
+						continue;
+					}
 
-				/* If using the current time, we're done. */
-				if (!timeset)
+					/* If using the current time, we're done. */
+					if (!timeset)
+						continue;
+				} else
 					continue;
-			} else
-				continue;
 		}
 
 		if (!aflag)
@@ -157,15 +158,20 @@
 			TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
 
 		/* Try utimes(2). */
+		if (S_ISLNK(sb.st_mode))
+		{
+			if (!lutimes(*argv, tv))
+				continue;
+		}
+		
 		if (!utimes(*argv, tv))
-			continue;
-
+			continue;	
+			
 		/* If the user specified a time, nothing else we can do. */
 		if (timeset) {
 			rval = 1;
 			warn("%s", *argv);
 		}
-
 		/*
 		 * System V and POSIX 1003.1 require that a NULL argument
 		 * set the aclearcase/" target="_blank" >ccess/modification times to the current time.

原文转自：http://www.ltesting.net