212 lines
7.2 KiB
C
212 lines
7.2 KiB
C
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/*
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* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
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*/
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/* $Id$ */
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/**********************************************************
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*
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* OS Testing - Silicon Graphics, Inc.
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*
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* FUNCTION NAME : rmobj()
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*
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* FUNCTION TITLE : Remove an object
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*
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* SYNOPSIS:
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* int rmobj(char *obj, char **errmsg)
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*
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* AUTHOR : Kent Rogers
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*
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* INITIAL RELEASE : UNICOS 7.0
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*
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* USER DESCRIPTION
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* This routine will remove the specified object. If the specified
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* object is a directory, it will recursively remove the directory
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* and everything underneath it. It assumes that it has privilege
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* to remove everything that it tries to remove. If rmobj() encounters
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* any problems, and errmsg is not NULL, errmsg is set to point to a
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* string explaining the error.
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*
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* DETAILED DESCRIPTION
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* Allocate space for the directory and its contents
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* Open the directory to get access to what is in it
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* Loop through the objects in the directory:
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* If the object is not "." or "..":
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* Determine the file type by calling lstat()
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* If the object is not a directory:
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* Remove the object with unlink()
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* Else:
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* Call rmobj(object) to remove the object's contents
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* Determine the link count on object by calling lstat()
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* If the link count >= 3:
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* Remove the directory with unlink()
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* Else
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* Remove the directory with rmdir()
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* Close the directory and free the pointers
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*
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* RETURN VALUE
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* If there are any problems, rmobj() will set errmsg (if it was not
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* NULL) and return -1. Otherwise it will return 0.
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*
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************************************************************/
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#include <errno.h> /* for errno */
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#include <stdio.h> /* for NULL */
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#include <stdlib.h> /* for malloc() */
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#include <string.h> /* for string function */
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#include <limits.h> /* for PATH_MAX */
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#include <sys/types.h> /* for opendir(), readdir(), closedir(), stat() */
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#include <sys/stat.h> /* for [l]stat() */
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#include <dirent.h> /* for opendir(), readdir(), closedir() */
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#include <unistd.h> /* for rmdir(), unlink() */
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#include "rmobj.h"
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#define SYSERR strerror(errno)
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int
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rmobj(char *obj, char **errmsg)
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{
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int ret_val = 0; /* return value from this routine */
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DIR *dir; /* pointer to a directory */
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struct dirent *dir_ent; /* pointer to directory entries */
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char dirobj[PATH_MAX]; /* object inside directory to modify */
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struct stat statbuf; /* used to hold stat information */
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static char err_msg[1024]; /* error message */
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/* Determine the file type */
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if ( lstat(obj, &statbuf) < 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "lstat(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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}
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/* Take appropriate action, depending on the file type */
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if ( (statbuf.st_mode & S_IFMT) == S_IFDIR ) {
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/* object is a directory */
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/* Do NOT perform the request if the directory is "/" */
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if ( !strcmp(obj, "/") ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "Cannot remove /");
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*errmsg = err_msg;
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}
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return -1;
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}
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/* Open the directory to get access to what is in it */
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if ( (dir = opendir(obj)) == NULL ) {
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if ( rmdir(obj) != 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "rmdir(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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} else {
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return 0;
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}
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}
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/* Loop through the entries in the directory, removing each one */
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for ( dir_ent = (struct dirent *)readdir(dir);
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dir_ent != NULL;
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dir_ent = (struct dirent *)readdir(dir)) {
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/* Don't remove "." or ".." */
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if ( !strcmp(dir_ent->d_name, ".") || !strcmp(dir_ent->d_name, "..") )
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continue;
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/* Recursively call this routine to remove the current entry */
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sprintf(dirobj, "%s/%s", obj, dir_ent->d_name);
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if ( rmobj(dirobj, errmsg) != 0 )
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ret_val = -1;
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}
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/* Close the directory */
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closedir(dir);
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/* If there were problems removing an entry, don't attempt to
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remove the directory itself */
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if ( ret_val == -1 )
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return -1;
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/* Get the link count, now that all the entries have been removed */
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if ( lstat(obj, &statbuf) < 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "lstat(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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}
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/* Remove the directory itself */
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if ( statbuf.st_nlink >= 3 ) {
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/* The directory is linked; unlink() must be used */
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if ( unlink(obj) < 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "unlink(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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}
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} else {
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/* The directory is not linked; rmdir() can be used */
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if ( rmdir(obj) < 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "rmdir(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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}
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}
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} else {
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/* object is not a directory; just use unlink() */
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if ( unlink(obj) < 0 ) {
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if ( errmsg != NULL ) {
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sprintf(err_msg, "unlink(%s) failed; errno=%d: %s",
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obj, errno, SYSERR);
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*errmsg = err_msg;
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}
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return -1;
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}
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} /* if obj is a directory */
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/*
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* Everything must have went ok.
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*/
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return 0;
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} /* rmobj() */
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