1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include "lint.h" 30*0Sstevel@tonic-gate #include <libc.h> 31*0Sstevel@tonic-gate #include <fcntl.h> 32*0Sstevel@tonic-gate #include <stdlib.h> 33*0Sstevel@tonic-gate #include <unistd.h> 34*0Sstevel@tonic-gate #include <sys/types.h> 35*0Sstevel@tonic-gate #include <sys/stat.h> 36*0Sstevel@tonic-gate #include <sys/auxv.h> 37*0Sstevel@tonic-gate #include <mtlib.h> 38*0Sstevel@tonic-gate #include <thread.h> 39*0Sstevel@tonic-gate #include <synch.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate static mutex_t auxlock = DEFAULTMUTEX; 42*0Sstevel@tonic-gate 43*0Sstevel@tonic-gate /* 44*0Sstevel@tonic-gate * Get auxiliary entry. 45*0Sstevel@tonic-gate * Returns pointer to entry, or 0 if entry does not exist. 46*0Sstevel@tonic-gate */ 47*0Sstevel@tonic-gate static auxv_t * 48*0Sstevel@tonic-gate _getaux(int type) 49*0Sstevel@tonic-gate { 50*0Sstevel@tonic-gate static auxv_t *auxb = NULL; 51*0Sstevel@tonic-gate static size_t nauxv = 0; 52*0Sstevel@tonic-gate ssize_t i; 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate /* 55*0Sstevel@tonic-gate * The first time through, read the initial aux vector that was 56*0Sstevel@tonic-gate * passed to the process at exec(2). Only do this once. 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate if (auxb == NULL) { 59*0Sstevel@tonic-gate struct stat statb; 60*0Sstevel@tonic-gate int fd; 61*0Sstevel@tonic-gate 62*0Sstevel@tonic-gate lmutex_lock(&auxlock); 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate if (auxb == NULL) { 65*0Sstevel@tonic-gate if ((fd = open("/proc/self/auxv", O_RDONLY)) != -1 && 66*0Sstevel@tonic-gate fstat(fd, &statb) != -1) 67*0Sstevel@tonic-gate auxb = libc_malloc( 68*0Sstevel@tonic-gate statb.st_size + sizeof (auxv_t)); 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate if (auxb != NULL) { 71*0Sstevel@tonic-gate i = read(fd, auxb, statb.st_size); 72*0Sstevel@tonic-gate if (i != -1) { 73*0Sstevel@tonic-gate nauxv = i / sizeof (auxv_t); 74*0Sstevel@tonic-gate auxb[nauxv].a_type = AT_NULL; 75*0Sstevel@tonic-gate } else { 76*0Sstevel@tonic-gate libc_free(auxb); 77*0Sstevel@tonic-gate auxb = NULL; 78*0Sstevel@tonic-gate } 79*0Sstevel@tonic-gate } 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate if (fd != -1) 82*0Sstevel@tonic-gate (void) close(fd); 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate lmutex_unlock(&auxlock); 86*0Sstevel@tonic-gate } 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate /* 89*0Sstevel@tonic-gate * Scan the auxiliary entries looking for the required type. 90*0Sstevel@tonic-gate */ 91*0Sstevel@tonic-gate for (i = 0; i < nauxv; i++) 92*0Sstevel@tonic-gate if (auxb[i].a_type == type) 93*0Sstevel@tonic-gate return (&auxb[i]); 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate /* 96*0Sstevel@tonic-gate * No auxiliary array (static executable) or entry not found. 97*0Sstevel@tonic-gate */ 98*0Sstevel@tonic-gate return ((auxv_t *)0); 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate /* 102*0Sstevel@tonic-gate * These two routines are utilities exported to the rest of libc. 103*0Sstevel@tonic-gate */ 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate long 106*0Sstevel@tonic-gate ___getauxval(int type) 107*0Sstevel@tonic-gate { 108*0Sstevel@tonic-gate auxv_t *auxp; 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate if ((auxp = _getaux(type)) != (auxv_t *)0) 111*0Sstevel@tonic-gate return (auxp->a_un.a_val); 112*0Sstevel@tonic-gate return (0); 113*0Sstevel@tonic-gate } 114*0Sstevel@tonic-gate 115*0Sstevel@tonic-gate void * 116*0Sstevel@tonic-gate ___getauxptr(int type) 117*0Sstevel@tonic-gate { 118*0Sstevel@tonic-gate auxv_t *auxp; 119*0Sstevel@tonic-gate 120*0Sstevel@tonic-gate if ((auxp = _getaux(type)) != (auxv_t *)0) 121*0Sstevel@tonic-gate return (auxp->a_un.a_ptr); 122*0Sstevel@tonic-gate return (0); 123*0Sstevel@tonic-gate } 124