1 /*- 2 * Copyright (c) 1989, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)kvm_file.c 8.2 (Berkeley) 08/20/94"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 /* 13 * File list interface for kvm. pstat, fstat and netstat are 14 * users of this code, so we've factored it out into a separate module. 15 * Thus, we keep this grunge out of the other kvm applications (i.e., 16 * most other applications are interested only in open/close/read/nlist). 17 */ 18 19 #include <sys/param.h> 20 #include <sys/user.h> 21 #include <sys/proc.h> 22 #include <sys/exec.h> 23 #define KERNEL 24 #include <sys/file.h> 25 #undef KERNEL 26 #include <sys/stat.h> 27 #include <sys/ioctl.h> 28 #include <sys/tty.h> 29 #include <nlist.h> 30 #include <kvm.h> 31 32 #include <vm/vm.h> 33 #include <vm/vm_param.h> 34 #include <vm/swap_pager.h> 35 36 #include <sys/sysctl.h> 37 38 #include <limits.h> 39 #include <ndbm.h> 40 #include <paths.h> 41 42 #include "kvm_private.h" 43 44 #define KREAD(kd, addr, obj) \ 45 (kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj)) 46 47 /* 48 * Get file structures. 49 */ 50 static 51 kvm_deadfiles(kd, op, arg, filehead_o, nfiles) 52 kvm_t *kd; 53 int op, arg, nfiles; 54 long filehead_o; 55 { 56 int buflen = kd->arglen, needed = buflen, error, n = 0; 57 struct file *fp, file; 58 struct filelist filehead; 59 register char *where = kd->argspc; 60 char *start = where; 61 62 /* 63 * first copyout filehead 64 */ 65 if (buflen > sizeof (filehead)) { 66 if (KREAD(kd, filehead_o, &filehead)) { 67 _kvm_err(kd, kd->program, "can't read filehead"); 68 return (0); 69 } 70 buflen -= sizeof (filehead); 71 where += sizeof (filehead); 72 *(struct filelist *)kd->argspc = filehead; 73 } 74 /* 75 * followed by an array of file structures 76 */ 77 for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) { 78 if (buflen > sizeof (struct file)) { 79 if (KREAD(kd, (long)fp, ((struct file *)where))) { 80 _kvm_err(kd, kd->program, "can't read kfp"); 81 return (0); 82 } 83 buflen -= sizeof (struct file); 84 fp = (struct file *)where; 85 where += sizeof (struct file); 86 n++; 87 } 88 } 89 if (n != nfiles) { 90 _kvm_err(kd, kd->program, "inconsistant nfiles"); 91 return (0); 92 } 93 return (nfiles); 94 } 95 96 char * 97 kvm_getfiles(kd, op, arg, cnt) 98 kvm_t *kd; 99 int op, arg; 100 int *cnt; 101 { 102 int mib[2], size, st, nfiles; 103 struct file *fp, *fplim; 104 struct filelist filehead; 105 106 if (ISALIVE(kd)) { 107 size = 0; 108 mib[0] = CTL_KERN; 109 mib[1] = KERN_FILE; 110 st = sysctl(mib, 2, NULL, &size, NULL, 0); 111 if (st == -1) { 112 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 113 return (0); 114 } 115 if (kd->argspc == 0) 116 kd->argspc = (char *)_kvm_malloc(kd, size); 117 else if (kd->arglen < size) 118 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 119 if (kd->argspc == 0) 120 return (0); 121 kd->arglen = size; 122 st = sysctl(mib, 2, kd->argspc, &size, NULL, 0); 123 if (st == -1 || size < sizeof(filehead)) { 124 _kvm_syserr(kd, kd->program, "kvm_getfiles"); 125 return (0); 126 } 127 filehead = *(struct filelist *)kd->argspc; 128 fp = (struct file *)(kd->argspc + sizeof (filehead)); 129 fplim = (struct file *)(kd->argspc + size); 130 for (nfiles = 0; filehead.lh_first && (fp < fplim); nfiles++, fp++) 131 filehead.lh_first = fp->f_list.le_next; 132 } else { 133 struct nlist nl[3], *p; 134 135 nl[0].n_name = "_filehead"; 136 nl[1].n_name = "_nfiles"; 137 nl[2].n_name = 0; 138 139 if (kvm_nlist(kd, nl) != 0) { 140 for (p = nl; p->n_type != 0; ++p) 141 ; 142 _kvm_err(kd, kd->program, 143 "%s: no such symbol", p->n_name); 144 return (0); 145 } 146 if (KREAD(kd, nl[0].n_value, &nfiles)) { 147 _kvm_err(kd, kd->program, "can't read nfiles"); 148 return (0); 149 } 150 size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file); 151 if (kd->argspc == 0) 152 kd->argspc = (char *)_kvm_malloc(kd, size); 153 else if (kd->arglen < size) 154 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size); 155 if (kd->argspc == 0) 156 return (0); 157 kd->arglen = size; 158 nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles); 159 if (nfiles == 0) 160 return (0); 161 } 162 *cnt = nfiles; 163 return (kd->argspc); 164 } 165