swapon.c revision 179966
1/* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static const char copyright[] = 33"@(#) Copyright (c) 1980, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#ifndef lint 38static char sccsid[] = "@(#)swapon.c 8.1 (Berkeley) 6/5/93"; 39#endif /* not lint */ 40#endif 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sbin/swapon/swapon.c 179966 2008-06-23 22:17:08Z mtm $"); 43 44#include <sys/stat.h> 45#include <sys/param.h> 46#include <sys/sysctl.h> 47#include <vm/vm_param.h> 48 49#include <err.h> 50#include <errno.h> 51#include <fstab.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56#include <fcntl.h> 57#include <libutil.h> 58 59static void usage(void); 60static int swap_on_off(char *name, int ignoreebusy); 61static void swaplist(int, int, int); 62 63enum { SWAPON, SWAPOFF, SWAPCTL } orig_prog, which_prog = SWAPCTL; 64 65int 66main(int argc, char **argv) 67{ 68 struct fstab *fsp; 69 char *ptr; 70 int stat; 71 int ch, doall; 72 int sflag = 0, lflag = 0, hflag = 0, qflag = 0; 73 74 if ((ptr = strrchr(argv[0], '/')) == NULL) 75 ptr = argv[0]; 76 if (strstr(ptr, "swapon")) 77 which_prog = SWAPON; 78 else if (strstr(ptr, "swapoff")) 79 which_prog = SWAPOFF; 80 orig_prog = which_prog; 81 82 doall = 0; 83 while ((ch = getopt(argc, argv, "AadghklmqsU")) != -1) { 84 switch(ch) { 85 case 'A': 86 if (which_prog == SWAPCTL) { 87 doall = 1; 88 which_prog = SWAPON; 89 } else { 90 usage(); 91 } 92 break; 93 case 'a': 94 if (which_prog == SWAPON || which_prog == SWAPOFF) 95 doall = 1; 96 else 97 which_prog = SWAPON; 98 break; 99 case 'd': 100 if (which_prog == SWAPCTL) 101 which_prog = SWAPOFF; 102 else 103 usage(); 104 break; 105 case 'g': 106 hflag = 'G'; 107 break; 108 case 'h': 109 hflag = 'H'; 110 break; 111 case 'k': 112 hflag = 'K'; 113 break; 114 case 'l': 115 lflag = 1; 116 break; 117 case 'm': 118 hflag = 'M'; 119 break; 120 case 'q': 121 if (which_prog == SWAPON || which_prog == SWAPOFF) 122 qflag = 1; 123 break; 124 case 's': 125 sflag = 1; 126 break; 127 case 'U': 128 if (which_prog == SWAPCTL) { 129 doall = 1; 130 which_prog = SWAPOFF; 131 } else { 132 usage(); 133 } 134 break; 135 case '?': 136 default: 137 usage(); 138 } 139 } 140 argv += optind; 141 142 stat = 0; 143 if (which_prog == SWAPON || which_prog == SWAPOFF) { 144 if (doall) { 145 while ((fsp = getfsent()) != NULL) { 146 if (strcmp(fsp->fs_type, FSTAB_SW)) 147 continue; 148 if (strstr(fsp->fs_mntops, "noauto")) 149 continue; 150 if (swap_on_off(fsp->fs_spec, 1)) { 151 stat = 1; 152 } else { 153 if (!qflag) { 154 printf("%s: %sing %s as swap device\n", 155 getprogname(), 156 which_prog == SWAPOFF ? "remov" : "add", 157 fsp->fs_spec); 158 } 159 } 160 } 161 } 162 else if (!*argv) 163 usage(); 164 for (; *argv; ++argv) { 165 if (swap_on_off(*argv, 0)) { 166 stat = 1; 167 } else if (orig_prog == SWAPCTL) { 168 printf("%s: %sing %s as swap device\n", 169 getprogname(), which_prog == SWAPOFF ? "remov" : "add", 170 *argv); 171 } 172 } 173 } else { 174 if (lflag || sflag) 175 swaplist(lflag, sflag, hflag); 176 else 177 usage(); 178 } 179 exit(stat); 180} 181 182static int 183swap_on_off(char *name, int doingall) 184{ 185 if ((which_prog == SWAPOFF ? swapoff(name) : swapon(name)) == -1) { 186 switch (errno) { 187 case EBUSY: 188 if (!doingall) 189 warnx("%s: device already in use", name); 190 break; 191 case EINVAL: 192 if (which_prog == SWAPON) 193 warnx("%s: NSWAPDEV limit reached", name); 194 else if (!doingall) 195 warn("%s", name); 196 break; 197 default: 198 warn("%s", name); 199 break; 200 } 201 return(1); 202 } 203 return(0); 204} 205 206static void 207usage(void) 208{ 209 fprintf(stderr, "usage: %s ", getprogname()); 210 switch(orig_prog) { 211 case SWAPON: 212 case SWAPOFF: 213 fprintf(stderr, "-aq | file ...\n"); 214 break; 215 case SWAPCTL: 216 fprintf(stderr, "[-AghklmsU] [-a file ... | -d file ...]\n"); 217 break; 218 } 219 exit(1); 220} 221 222static void 223sizetobuf(char *buf, size_t bufsize, int hflag, long long val, int hlen, 224 long blocksize) 225{ 226 227 if (hflag == 'H') { 228 char tmp[16]; 229 230 humanize_number(tmp, 5, (int64_t)val, "", HN_AUTOSCALE, 231 HN_B | HN_NOSPACE | HN_DECIMAL); 232 snprintf(buf, bufsize, "%*s", hlen, tmp); 233 } else { 234 snprintf(buf, bufsize, "%*lld", hlen, val / blocksize); 235 } 236} 237 238static void 239swaplist(int lflag, int sflag, int hflag) 240{ 241 size_t mibsize, size; 242 struct xswdev xsw; 243 int hlen, mib[16], n, pagesize; 244 long blocksize; 245 long long total = 0; 246 long long used = 0; 247 long long tmp_total; 248 long long tmp_used; 249 char buf[32]; 250 251 pagesize = getpagesize(); 252 switch(hflag) { 253 case 'G': 254 blocksize = 1024 * 1024 * 1024; 255 strlcpy(buf, "1GB-blocks", sizeof(buf)); 256 hlen = 10; 257 break; 258 case 'H': 259 blocksize = -1; 260 strlcpy(buf, "Bytes", sizeof(buf)); 261 hlen = 10; 262 break; 263 case 'K': 264 blocksize = 1024; 265 strlcpy(buf, "1kB-blocks", sizeof(buf)); 266 hlen = 10; 267 break; 268 case 'M': 269 blocksize = 1024 * 1024; 270 strlcpy(buf, "1MB-blocks", sizeof(buf)); 271 hlen = 10; 272 break; 273 default: 274 getbsize(&hlen, &blocksize); 275 snprintf(buf, sizeof(buf), "%ld-blocks", blocksize); 276 break; 277 } 278 279 mibsize = sizeof mib / sizeof mib[0]; 280 if (sysctlnametomib("vm.swap_info", mib, &mibsize) == -1) 281 err(1, "sysctlnametomib()"); 282 283 if (lflag) { 284 printf("%-13s %*s %*s\n", 285 "Device:", 286 hlen, buf, 287 hlen, "Used:"); 288 } 289 290 for (n = 0; ; ++n) { 291 mib[mibsize] = n; 292 size = sizeof xsw; 293 if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1) 294 break; 295 if (xsw.xsw_version != XSWDEV_VERSION) 296 errx(1, "xswdev version mismatch"); 297 298 tmp_total = (long long)xsw.xsw_nblks * pagesize; 299 tmp_used = (long long)xsw.xsw_used * pagesize; 300 total += tmp_total; 301 used += tmp_used; 302 if (lflag) { 303 sizetobuf(buf, sizeof(buf), hflag, tmp_total, hlen, 304 blocksize); 305 printf("/dev/%-8s %s ", devname(xsw.xsw_dev, S_IFCHR), 306 buf); 307 sizetobuf(buf, sizeof(buf), hflag, tmp_used, hlen, 308 blocksize); 309 printf("%s\n", buf); 310 } 311 } 312 if (errno != ENOENT) 313 err(1, "sysctl()"); 314 315 if (sflag) { 316 sizetobuf(buf, sizeof(buf), hflag, total, hlen, blocksize); 317 printf("Total: %s ", buf); 318 sizetobuf(buf, sizeof(buf), hflag, used, hlen, blocksize); 319 printf("%s\n", buf); 320 } 321} 322 323