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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*/
/* $Id: rmobj.c,v 1.5 2009/07/20 10:59:32 vapier Exp $ */
/**********************************************************
*
* OS Testing - Silicon Graphics, Inc.
*
* FUNCTION NAME : rmobj()
*
* FUNCTION TITLE : Remove an object
*
* SYNOPSIS:
* int rmobj(char *obj, char **errmsg)
*
* AUTHOR : Kent Rogers
*
* INITIAL RELEASE : UNICOS 7.0
*
* USER DESCRIPTION
* This routine will remove the specified object. If the specified
* object is a directory, it will recursively remove the directory
* and everything underneath it. It assumes that it has privilege
* to remove everything that it tries to remove. If rmobj() encounters
* any problems, and errmsg is not NULL, errmsg is set to point to a
* string explaining the error.
*
* DETAILED DESCRIPTION
* Allocate space for the directory and its contents
* Open the directory to get access to what is in it
* Loop through the objects in the directory:
* If the object is not "." or "..":
* Determine the file type by calling lstat()
* If the object is not a directory:
* Remove the object with unlink()
* Else:
* Call rmobj(object) to remove the object's contents
* Determine the link count on object by calling lstat()
* If the link count >= 3:
* Remove the directory with unlink()
* Else
* Remove the directory with rmdir()
* Close the directory and free the pointers
*
* RETURN VALUE
* If there are any problems, rmobj() will set errmsg (if it was not
* NULL) and return -1. Otherwise it will return 0.
*
************************************************************/
#include <errno.h> /* for errno */
#include <stdio.h> /* for NULL */
#include <stdlib.h> /* for malloc() */
#include <string.h> /* for string function */
#include <limits.h> /* for PATH_MAX */
#include <sys/types.h> /* for opendir(), readdir(), closedir(), stat() */
#include <sys/stat.h> /* for [l]stat() */
#include <dirent.h> /* for opendir(), readdir(), closedir() */
#include <unistd.h> /* for rmdir(), unlink() */
#include "rmobj.h"
#define SYSERR strerror(errno)
int
rmobj(char *obj, char **errmsg)
{
int ret_val = 0; /* return value from this routine */
DIR *dir; /* pointer to a directory */
struct dirent *dir_ent; /* pointer to directory entries */
char dirobj[PATH_MAX]; /* object inside directory to modify */
struct stat statbuf; /* used to hold stat information */
static char err_msg[1024]; /* error message */
/* Determine the file type */
if (lstat(obj, &statbuf) < 0) {
if (errmsg != NULL) {
sprintf(err_msg, "lstat(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
}
/* Take appropriate action, depending on the file type */
if ((statbuf.st_mode & S_IFMT) == S_IFDIR) {
/* object is a directory */
/* Do NOT perform the request if the directory is "/" */
if (!strcmp(obj, "/")) {
if (errmsg != NULL) {
sprintf(err_msg, "Cannot remove /");
*errmsg = err_msg;
}
return -1;
}
/* Open the directory to get access to what is in it */
if ((dir = opendir(obj)) == NULL) {
if (rmdir(obj) != 0) {
if (errmsg != NULL) {
sprintf(err_msg, "rmdir(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
} else {
return 0;
}
}
/* Loop through the entries in the directory, removing each one */
for (dir_ent = (struct dirent *)readdir(dir);
dir_ent != NULL;
dir_ent = (struct dirent *)readdir(dir)) {
/* Don't remove "." or ".." */
if (!strcmp(dir_ent->d_name, ".") || !strcmp(dir_ent->d_name, ".."))
continue;
/* Recursively call this routine to remove the current entry */
sprintf(dirobj, "%s/%s", obj, dir_ent->d_name);
if (rmobj(dirobj, errmsg) != 0)
ret_val = -1;
}
/* Close the directory */
closedir(dir);
/* If there were problems removing an entry, don't attempt to
remove the directory itself */
if (ret_val == -1)
return -1;
/* Get the link count, now that all the entries have been removed */
if (lstat(obj, &statbuf) < 0) {
if (errmsg != NULL) {
sprintf(err_msg, "lstat(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
}
/* Remove the directory itself */
if (statbuf.st_nlink >= 3) {
/* The directory is linked; unlink() must be used */
if (unlink(obj) < 0) {
if (errmsg != NULL) {
sprintf(err_msg, "unlink(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
}
} else {
/* The directory is not linked; remove() can be used */
if (remove(obj) < 0) {
if (errmsg != NULL) {
sprintf(err_msg, "remove(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
}
}
} else {
/* object is not a directory; just use unlink() */
if (unlink(obj) < 0) {
if (errmsg != NULL) {
sprintf(err_msg, "unlink(%s) failed; errno=%d: %s",
obj, errno, SYSERR);
*errmsg = err_msg;
}
return -1;
}
} /* if obj is a directory */
/*
* Everything must have went ok.
*/
return 0;
} /* rmobj() */
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