1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)mkswapconf.c 5.9 (Berkeley) 01/09/91"; 10 #endif /* not lint */ 11 12 /* 13 * Build a swap configuration file. 14 */ 15 #include "config.h" 16 17 #include <stdio.h> 18 #include <ctype.h> 19 20 swapconf() 21 { 22 register struct file_list *fl; 23 struct file_list *do_swap(); 24 25 fl = conf_list; 26 while (fl) { 27 if (fl->f_type != SYSTEMSPEC) { 28 fl = fl->f_next; 29 continue; 30 } 31 fl = do_swap(fl); 32 } 33 } 34 35 struct file_list * 36 do_swap(fl) 37 register struct file_list *fl; 38 { 39 FILE *fp; 40 char swapname[80]; 41 register struct file_list *swap; 42 dev_t dev; 43 44 if (eq(fl->f_fn, "generic")) { 45 fl = fl->f_next; 46 return (fl->f_next); 47 } 48 (void) sprintf(swapname, "swap%s.c", fl->f_fn); 49 fp = fopen(path(swapname), "w"); 50 if (fp == 0) { 51 perror(path(swapname)); 52 exit(1); 53 } 54 fprintf(fp, "#include \"sys/param.h\"\n"); 55 fprintf(fp, "#include \"sys/conf.h\"\n"); 56 fprintf(fp, "\n"); 57 /* 58 * If there aren't any swap devices 59 * specified, just return, the error 60 * has already been noted. 61 */ 62 swap = fl->f_next; 63 if (swap == 0 || swap->f_type != SWAPSPEC) { 64 (void) unlink(path(swapname)); 65 fclose(fp); 66 return (swap); 67 } 68 fprintf(fp, "dev_t\trootdev = makedev(%d, %d);\n", 69 major(fl->f_rootdev), minor(fl->f_rootdev)); 70 fprintf(fp, "dev_t\targdev = makedev(%d, %d);\n", 71 major(fl->f_argdev), minor(fl->f_argdev)); 72 fprintf(fp, "dev_t\tdumpdev = makedev(%d, %d);\n", 73 major(fl->f_dumpdev), minor(fl->f_dumpdev)); 74 fprintf(fp, "\n"); 75 fprintf(fp, "struct\tswdevt swdevt[] = {\n"); 76 do { 77 dev = swap->f_swapdev; 78 fprintf(fp, "\t{ makedev(%d, %d),\t0,\t%d },\t/* %s */\n", 79 major(dev), minor(dev), swap->f_swapsize, swap->f_fn); 80 swap = swap->f_next; 81 } while (swap && swap->f_type == SWAPSPEC); 82 fprintf(fp, "\t{ 0, 0, 0 }\n"); 83 fprintf(fp, "};\n"); 84 fclose(fp); 85 return (swap); 86 } 87 88 static int devtablenotread = 1; 89 static struct devdescription { 90 char *dev_name; 91 int dev_major; 92 struct devdescription *dev_next; 93 } *devtable; 94 95 /* 96 * Given a device name specification figure out: 97 * major device number 98 * partition 99 * device name 100 * unit number 101 * This is a hack, but the system still thinks in 102 * terms of major/minor instead of string names. 103 */ 104 dev_t 105 nametodev(name, defunit, defpartition) 106 char *name; 107 int defunit; 108 char defpartition; 109 { 110 char *cp, partition; 111 int unit; 112 register struct devdescription *dp; 113 114 cp = name; 115 if (cp == 0) { 116 fprintf(stderr, "config: internal error, nametodev\n"); 117 exit(1); 118 } 119 while (*cp && !isdigit(*cp)) 120 cp++; 121 unit = *cp ? atoi(cp) : defunit; 122 if (unit < 0 || unit > 31) { 123 fprintf(stderr, 124 "config: %s: invalid device specification, unit out of range\n", name); 125 unit = defunit; /* carry on more checking */ 126 } 127 if (*cp) { 128 *cp++ = '\0'; 129 while (*cp && isdigit(*cp)) 130 cp++; 131 } 132 partition = *cp ? *cp : defpartition; 133 if (partition < 'a' || partition > 'h') { 134 fprintf(stderr, 135 "config: %c: invalid device specification, bad partition\n", *cp); 136 partition = defpartition; /* carry on */ 137 } 138 if (devtablenotread) 139 initdevtable(); 140 for (dp = devtable; dp; dp = dp->dev_next) 141 if (eq(name, dp->dev_name)) 142 break; 143 if (dp == 0) { 144 fprintf(stderr, "config: %s: unknown device\n", name); 145 return (NODEV); 146 } 147 return (makedev(dp->dev_major, (unit << 3) + (partition - 'a'))); 148 } 149 150 char * 151 devtoname(dev) 152 dev_t dev; 153 { 154 char buf[80]; 155 register struct devdescription *dp; 156 157 if (devtablenotread) 158 initdevtable(); 159 for (dp = devtable; dp; dp = dp->dev_next) 160 if (major(dev) == dp->dev_major) 161 break; 162 if (dp == 0) 163 dp = devtable; 164 (void) sprintf(buf, "%s%d%c", dp->dev_name, 165 minor(dev) >> 3, (minor(dev) & 07) + 'a'); 166 return (ns(buf)); 167 } 168 169 initdevtable() 170 { 171 char buf[BUFSIZ]; 172 int maj; 173 register struct devdescription **dp = &devtable; 174 FILE *fp; 175 176 (void) sprintf(buf, "../conf/devices.%s", machinename); 177 fp = fopen(buf, "r"); 178 if (fp == NULL) { 179 fprintf(stderr, "config: can't open %s\n", buf); 180 exit(1); 181 } 182 while (fscanf(fp, "%s\t%d\n", buf, &maj) == 2) { 183 *dp = (struct devdescription *)malloc(sizeof (**dp)); 184 (*dp)->dev_name = ns(buf); 185 (*dp)->dev_major = maj; 186 dp = &(*dp)->dev_next; 187 } 188 *dp = 0; 189 fclose(fp); 190 devtablenotread = 0; 191 } 192