1 /* 2 * Copyright (c) 2008 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sbin/hammer/cycle.c,v 1.2 2008/05/12 21:17:16 dillon Exp $ 35 */ 36 37 #include "hammer.h" 38 39 int64_t 40 hammer_get_cycle(int64_t default_obj_id) 41 { 42 int64_t obj_id; 43 FILE *fp; 44 45 if (CyclePath && (fp = fopen(CyclePath, "r")) != NULL) { 46 if (fscanf(fp, "%llx\n", &obj_id) != 1) { 47 obj_id = default_obj_id; 48 fprintf(stderr, "Warning: malformed obj_id in %s\n", 49 CyclePath); 50 } 51 fclose(fp); 52 } else { 53 obj_id = default_obj_id; 54 } 55 return(obj_id); 56 } 57 58 void 59 hammer_set_cycle(int64_t obj_id) 60 { 61 FILE *fp; 62 63 if ((fp = fopen(CyclePath, "w")) != NULL) { 64 fprintf(fp, "%016llx\n", obj_id); 65 fclose(fp); 66 } else { 67 fprintf(stderr, "Warning: Unable to write to %s: %s\n", 68 CyclePath, strerror(errno)); 69 } 70 } 71 72 void 73 hammer_reset_cycle(void) 74 { 75 remove(CyclePath); 76 } 77 78