db/os/os_tmpdir.c

	os_tmpdir.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1998
 *  Sleepycat Software.  All rights reserved.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)os_tmpdir.c   10.3 (Sleepycat) 10/13/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#endif

#include "db_int.h"
#include "common_ext.h"

#ifdef macintosh
#include <TFileSpec.h>
#endif

/*
 * __os_tmpdir --
 *  Set the temporary directory path.
 *
 * The order of items in the list structure and the order of checks in
 * the environment are documented.
 *
 * PUBLIC: int __os_tmpdir __P((DB_ENV *, u_int32_t));
 */
int
__os_tmpdir(dbenv, flags)
    DB_ENV *dbenv;
    u_int32_t flags;
{
    /*
     * !!!
     * Don't change this to:
     *
     *  static const char * const list[]
     *
     * because it creates a text relocation in position independent code.
     */
    static const char * list[] = {
        "/var/tmp",
        "/usr/tmp",
        "/temp",        /* Windows. */
        "/tmp",
        "C:/temp",      /* Windows. */
        "C:/tmp",       /* Windows. */
        NULL
    };
    const char * const *lp, *p;

    /* Use the environment if it's permitted and initialized. */
    p = NULL;
#ifdef HAVE_GETEUID
    if (LF_ISSET(DB_USE_ENVIRON) ||
        (LF_ISSET(DB_USE_ENVIRON_ROOT) && getuid() == 0))
#else
    if (LF_ISSET(DB_USE_ENVIRON))
#endif
    {
        if ((p = getenv("TMPDIR")) != NULL && p[0] == '\0') {
            __db_err(dbenv, "illegal TMPDIR environment variable");
            return (EINVAL);
        }
        /* Windows */
        if (p == NULL && (p = getenv("TEMP")) != NULL && p[0] == '\0') {
            __db_err(dbenv, "illegal TEMP environment variable");
            return (EINVAL);
        }
        /* Windows */
        if (p == NULL && (p = getenv("TMP")) != NULL && p[0] == '\0') {
            __db_err(dbenv, "illegal TMP environment variable");
            return (EINVAL);
        }
        /* Macintosh */
        if (p == NULL &&
            (p = getenv("TempFolder")) != NULL && p[0] == '\0') {
            __db_err(dbenv,
                "illegal TempFolder environment variable");
            return (EINVAL);
        }
    }

#ifdef macintosh
    /* Get the path to the temporary folder. */
    if (p == NULL) {
        FSSpec spec;

        if (!Special2FSSpec(kTemporaryFolderType,
            kOnSystemDisk, 0, &spec))
            (void)__os_strdup(FSp2FullPath(&spec), &p);
    }
#endif

    /* Step through the list looking for a possibility. */
    if (p == NULL)
        for (lp = list; *lp != NULL; ++lp)
            if (__os_exists(p = *lp, NULL) == 0)
                break;
    if (p == NULL)
        return (0);

    return (__os_strdup(p, &dbenv->db_tmp_dir));
}