1 /* $NetBSD: itime.c,v 1.22 2019/03/25 02:13:01 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)itime.c 8.1 (Berkeley) 6/5/93"; 36 #else 37 __RCSID("$NetBSD: itime.c,v 1.22 2019/03/25 02:13:01 manu Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/queue.h> 43 #include <sys/time.h> 44 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <time.h> 51 #include <unistd.h> 52 53 #include "dump.h" 54 55 struct dumptime { 56 struct dumpdates dt_value; 57 SLIST_ENTRY(dumptime) dt_list; 58 }; 59 SLIST_HEAD(dthead, dumptime) dthead = SLIST_HEAD_INITIALIZER(dthead); 60 struct dumpdates **ddatev = 0; 61 int nddates = 0; 62 63 static void dumprecout(FILE *, struct dumpdates *); 64 static int getrecord(FILE *, struct dumpdates *); 65 static int makedumpdate(struct dumpdates *, const char *); 66 static void readdumptimes(FILE *); 67 68 void 69 initdumptimes(void) 70 { 71 FILE *df; 72 73 if ((df = fopen(dumpdates, "r")) == NULL) { 74 if (errno != ENOENT) { 75 msg("WARNING: cannot read %s: %s\n", dumpdates, 76 strerror(errno)); 77 return; 78 } 79 /* 80 * Dumpdates does not exist, make an empty one. 81 */ 82 msg("WARNING: no file `%s', making an empty one\n", dumpdates); 83 if ((df = fopen(dumpdates, "w")) == NULL) { 84 msg("WARNING: cannot create %s: %s\n", dumpdates, 85 strerror(errno)); 86 return; 87 } 88 (void) fclose(df); 89 if ((df = fopen(dumpdates, "r")) == NULL) { 90 quite(errno, "cannot read %s even after creating it", 91 dumpdates); 92 /* NOTREACHED */ 93 } 94 } 95 (void) flock(fileno(df), LOCK_SH); 96 readdumptimes(df); 97 (void) fclose(df); 98 } 99 100 static void 101 readdumptimes(FILE *df) 102 { 103 int i; 104 struct dumptime *dtwalk; 105 106 for (;;) { 107 dtwalk = (struct dumptime *)xcalloc(1, sizeof(struct dumptime)); 108 if (getrecord(df, &(dtwalk->dt_value)) < 0) { 109 free(dtwalk); 110 break; 111 } 112 nddates++; 113 SLIST_INSERT_HEAD(&dthead, dtwalk, dt_list); 114 } 115 116 /* 117 * arrayify the list, leaving enough room for the additional 118 * record that we may have to add to the ddate structure 119 */ 120 ddatev = (struct dumpdates **) 121 xcalloc((unsigned) (nddates + 1), sizeof(struct dumpdates *)); 122 dtwalk = SLIST_FIRST(&dthead); 123 for (i = nddates - 1; i >= 0; i--, dtwalk = SLIST_NEXT(dtwalk, dt_list)) 124 ddatev[i] = &dtwalk->dt_value; 125 } 126 127 void 128 getdumptime(void) 129 { 130 struct dumpdates *ddp; 131 int i; 132 const char *fname; 133 134 fname = dumpdev ? dumpdev : disk; 135 #ifdef FDEBUG 136 msg("Looking for name %s in dumpdates = %s for level = %c\n", 137 fname, dumpdates, level); 138 #endif 139 spcl.c_ddate = 0; 140 lastlevel = '0'; 141 142 initdumptimes(); 143 /* 144 * Go find the entry with the same name for a lower increment 145 * and older date. If we are doing a true incremental, then 146 * we can use any level as a ref point. 147 */ 148 ITITERATE(i, ddp) { 149 if (strncmp(fname, ddp->dd_name, sizeof (ddp->dd_name)) != 0) 150 continue; 151 /* trueinc: ostensibly could omit the second clause 152 * since if trueinc is set, we don't care about the level 153 * at all. 154 */ 155 /* if ((!trueinc && (ddp->dd_level >= level)) || 156 (trueinc && (ddp->dd_level > level))) */ 157 if (!trueinc && (ddp->dd_level >= level)) 158 continue; 159 if (ddp->dd_ddate <= iswap32(spcl.c_ddate)) 160 continue; 161 spcl.c_ddate = iswap32(ddp->dd_ddate); 162 lastlevel = ddp->dd_level; 163 } 164 } 165 166 void 167 putdumptime(void) 168 { 169 FILE *df; 170 struct dumpdates *dtwalk, *dtfound; 171 int i; 172 int fd; 173 const char *fname; 174 175 if (uflag == 0 && dumpdev == NULL) 176 return; 177 if ((df = fopen(dumpdates, "r+")) == NULL) 178 quite(errno, "cannot rewrite %s", dumpdates); 179 fd = fileno(df); 180 (void) flock(fd, LOCK_EX); 181 fname = dumpdev ? dumpdev : disk; 182 free((char *)ddatev); 183 ddatev = 0; 184 nddates = 0; 185 readdumptimes(df); 186 if (fseek(df, 0L, 0) < 0) 187 quite(errno, "can't fseek %s", dumpdates); 188 spcl.c_ddate = 0; 189 ITITERATE(i, dtwalk) { 190 if (strncmp(fname, dtwalk->dd_name, 191 sizeof (dtwalk->dd_name)) != 0) 192 continue; 193 if (dtwalk->dd_level != level) 194 continue; 195 goto found; 196 } 197 /* 198 * construct the new upper bound; 199 * Enough room has been allocated. 200 */ 201 dtwalk = ddatev[nddates] = 202 (struct dumpdates *)xcalloc(1, sizeof (struct dumpdates)); 203 nddates += 1; 204 found: 205 (void) strlcpy(dtwalk->dd_name, fname, sizeof(dtwalk->dd_name)); 206 dtwalk->dd_level = level; 207 dtwalk->dd_ddate = iswap32(spcl.c_date); 208 dtfound = dtwalk; 209 210 ITITERATE(i, dtwalk) { 211 dumprecout(df, dtwalk); 212 } 213 if (fflush(df)) 214 quite(errno, "can't flush %s", dumpdates); 215 if (ftruncate(fd, ftell(df))) 216 quite(errno, "can't ftruncate %s", dumpdates); 217 (void) fclose(df); 218 msg("level %c dump on %s", level, 219 spcl.c_date == 0 ? "the epoch\n" : ctime(&dtfound->dd_ddate)); 220 } 221 222 static void 223 dumprecout(FILE *file, struct dumpdates *what) 224 { 225 226 if (fprintf(file, DUMPOUTFMT, 227 what->dd_name, 228 what->dd_level, 229 ctime(&what->dd_ddate)) < 0) 230 quite(errno, "can't write %s", dumpdates); 231 } 232 233 int recno; 234 235 static int 236 getrecord(FILE *df, struct dumpdates *ddatep) 237 { 238 char tbuf[BUFSIZ]; 239 240 recno = 0; 241 if ( (fgets(tbuf, sizeof (tbuf), df)) != tbuf) 242 return(-1); 243 recno++; 244 if (makedumpdate(ddatep, tbuf) < 0) 245 msg("Unknown intermediate format in %s, line %d\n", 246 dumpdates, recno); 247 248 #ifdef FDEBUG 249 msg("getrecord: %s %c %s", ddatep->dd_name, ddatep->dd_level, 250 ddatep->dd_ddate == 0 ? "the epoch\n" : ctime(&ddatep->dd_ddate)); 251 #endif 252 return(0); 253 } 254 255 static int 256 makedumpdate(struct dumpdates *ddp, const char *tbuf) 257 { 258 char un_buf[128]; 259 260 (void) sscanf(tbuf, DUMPINFMT, ddp->dd_name, &ddp->dd_level, un_buf); 261 ddp->dd_ddate = unctime(un_buf); 262 if (ddp->dd_ddate < 0) 263 return(-1); 264 return(0); 265 } 266
Indexes created Sat Sep 20 22:09:52 GMT 2025