source: trunk/third/evolution/e-util/e-mktemp.c @ 18142

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 * 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 will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <glib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>

#ifdef ENABLE_THREADS
#include <pthread.h>
#endif

#include "e-mktemp.h"


static gboolean initialized = FALSE;
static GSList *temp_files = NULL;
static GSList *temp_dirs = NULL;
#ifdef ENABLE_THREADS
static pthread_mutex_t temp_files_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t temp_dirs_lock = PTHREAD_MUTEX_INITIALIZER;
#define TEMP_FILES_LOCK() pthread_mutex_lock (&temp_files_lock)
#define TEMP_FILES_UNLOCK() pthread_mutex_unlock (&temp_files_lock)
#define TEMP_DIRS_LOCK() pthread_mutex_lock (&temp_dirs_lock)
#define TEMP_DIRS_UNLOCK() pthread_mutex_unlock (&temp_dirs_lock)
#else
#define TEMP_FILES_LOCK()
#define TEMP_FILES_UNLOCK()
#define TEMP_DIRS_LOCK()
#define TEMP_DIRS_UNLOCK()
#endif /* ENABLE_THREADS */


static GString *
get_path (gboolean make)
{
        GString *path;
        
        path = g_string_new ("/tmp/evolution-");
        g_string_sprintfa (path, "%d-%d", (int) getuid (), (int) getpid ());
        
        if (make) {
                int ret;
                
                /* shoot now, ask questions later */
                ret = mkdir (path->str, S_IRWXU);
                if (ret == -1) {
                        if (errno == EEXIST) {
                                struct stat st;
                                
                                if (stat (path->str, &st) == -1) {
                                        /* reset errno */
                                        errno = EEXIST;
                                        g_string_free (path, TRUE);
                                        return NULL;
                                }
                                
                                /* make sure this is a directory and belongs to us... */
                                if (!S_ISDIR (st.st_mode) || st.st_uid != getuid ()) {
                                        /* eek! this is bad... */
                                        g_string_free (path, TRUE);
                                        return NULL;
                                }
                        } else {
                                /* some other error...do not pass go, do not collect $200 */
                                g_string_free (path, TRUE);
                                return NULL;
                        }
                }
        }
        
        return path;
}

static void
e_mktemp_cleanup (void)
{
        GString *path;
        GSList *node;
        
        TEMP_FILES_LOCK ();
        if (temp_files) {
                node = temp_files;
                while (node) {
                        unlink (node->data);
                        g_free (node->data);
                        node = node->next;
                }
                g_slist_free (temp_files);
                temp_files = NULL;
        }
        TEMP_FILES_UNLOCK ();
        
        TEMP_DIRS_LOCK ();
        if (temp_dirs) {
                node = temp_dirs;
                while (node) {
                        /* perform the equivalent of a rm -rf */
                        struct dirent *dent;
                        DIR *dir;
                        
                        /* first empty out this directory of it's files... */
                        dir = opendir (node->data);
                        if (dir) {
                                while ((dent = readdir (dir)) != NULL) {
                                        /* yea...so if we contain
                                           subdirectories this won't work, but
                                           it shouldn't so we won't
                                           bother caring... */
                                        if (strcmp (dent->d_name, ".") && strcmp (dent->d_name, ".."))
                                                unlink (dent->d_name);
                                }
                                closedir (dir);
                        }
                        
                        /* ...then rmdir the directory */
                        rmdir (node->data);
                        g_free (node->data);
                        node = node->next;
                }
                g_slist_free (temp_dirs);
                temp_dirs = NULL;
        }
        TEMP_DIRS_UNLOCK ();
        
        path = get_path (FALSE);
        rmdir (path->str);
        
        g_string_free (path, TRUE);
}


const char *
e_mktemp (const char *template)
{
        GString *path;
        char *ret;
        
        path = get_path (TRUE);
        if (!path)
                return NULL;
        
        g_string_append_c (path, '/');
        if (template)
                g_string_append (path, template);
        else
                g_string_append (path, "unknown-XXXXXX");
        
        ret = mktemp (path->str);
        if (ret) {
                TEMP_FILES_LOCK ();
                if (!initialized) {
                        g_atexit (e_mktemp_cleanup);
                        initialized = TRUE;
                }
                temp_files = g_slist_prepend (temp_files, ret);
                g_string_free (path, FALSE);
                TEMP_FILES_UNLOCK ();
        } else {
                g_string_free (path, TRUE);
        }
        
        return ret;
}


int
e_mkstemp (const char *template)
{
        GString *path;
        int fd;
        
        path = get_path (TRUE);
        if (!path)
                return -1;
        
        g_string_append_c (path, '/');
        if (template)
                g_string_append (path, template);
        else
                g_string_append (path, "unknown-XXXXXX");
        
        fd = mkstemp (path->str);
        if (fd != -1) {
                TEMP_FILES_LOCK ();
                if (!initialized) {
                        g_atexit (e_mktemp_cleanup);
                        initialized = TRUE;
                }
                temp_files = g_slist_prepend (temp_files, path->str);
                g_string_free (path, FALSE);
                TEMP_FILES_UNLOCK ();
        } else {
                g_string_free (path, TRUE);
        }
        
        return fd;
}


const char *
e_mkdtemp (const char *template)
{
        GString *path;
        char *tmpdir;
        
        path = get_path (TRUE);
        if (!path)
                return NULL;
        
        g_string_append_c (path, '/');
        if (template)
                g_string_append (path, template);
        else
                g_string_append (path, "unknown-XXXXXX");
        
#ifdef HAVE_MKDTEMP
        tmpdir = mkdtemp (path->str);
#else
        tmpdir = mktemp (path->str);
        if (tmpdir) {
                if (mkdir (tmpdir, S_IRWXU) == -1)
                        tmpdir = NULL;
        }
#endif
        
        if (tmpdir) {
                TEMP_DIRS_LOCK ();
                if (!initialized) {
                        g_atexit (e_mktemp_cleanup);
                        initialized = TRUE;
                }
                temp_dirs = g_slist_prepend (temp_dirs, tmpdir);
                g_string_free (path, FALSE);
                TEMP_DIRS_UNLOCK ();
        } else {
                g_string_free (path, TRUE);
        }
        
        return tmpdir;
}