1 /* 2 * Copyright (c) 2005 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/jscan/jsession.c,v 1.3 2005/09/07 19:10:09 dillon Exp $ 35 */ 36 37 #include "jscan.h" 38 39 void 40 jsession_init(struct jsession *ss, struct jfile *jfin, 41 enum jdirection direction, 42 const char *transid_file, int64_t transid) 43 { 44 bzero(ss, sizeof(*ss)); 45 ss->ss_jfin = jfin; 46 ss->ss_direction = direction; 47 ss->ss_transid = transid; 48 ss->ss_transid_file = transid_file; 49 ss->ss_transid_fd = -1; 50 } 51 52 /* 53 * Update the last-processed transid. If operating in the reverse 54 * direction we have to write out transid - 1 so the next reverse 55 * processing operation does not re-execute the transid just executed 56 * and so the next forward processing operation does. 57 */ 58 void 59 jsession_update_transid(struct jsession *ss __unused, int64_t transid) 60 { 61 char buf[32]; 62 63 if (ss->ss_transid_file) { 64 if (ss->ss_transid_fd < 0) { 65 ss->ss_transid_fd = open(ss->ss_transid_file, O_RDWR|O_CREAT, 0666); 66 } 67 if (ss->ss_transid_fd < 0) { 68 fprintf(stderr, "Cannot open/create %s\n", ss->ss_transid_file); 69 exit(1); 70 } 71 if (ss->ss_direction == JD_FORWARDS) 72 snprintf(buf, sizeof(buf), "%016jx\n", (uintmax_t)transid); 73 else 74 snprintf(buf, sizeof(buf), "%016jx\n", (uintmax_t)(transid - 1)); 75 lseek(ss->ss_transid_fd, 0L, 0); 76 write(ss->ss_transid_fd, buf, strlen(buf)); 77 if (fsync_opt > 1) 78 fsync(ss->ss_transid_fd); 79 } 80 } 81 82 /* 83 * Returns non-zero if the data can be dumped into the specified session. 84 */ 85 int 86 jsession_check(struct jsession *ss, struct jdata *jd) 87 { 88 if (ss->ss_direction == JD_FORWARDS) { 89 if (jd->jd_transid > ss->ss_transid) 90 return(1); 91 } else { 92 if (jd->jd_transid <= ss->ss_transid) 93 return(1); 94 } 95 return(0); 96 } 97 98 void 99 jsession_term(struct jsession *ss) 100 { 101 if (ss->ss_transid_fd >= 0) { 102 close(ss->ss_transid_fd); 103 ss->ss_transid_fd = -1; 104 } 105 } 106 107