10Sstevel@tonic-gate /* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 50Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 60Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 70Sstevel@tonic-gate * with the License. 80Sstevel@tonic-gate * 90Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 100Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 110Sstevel@tonic-gate * See the License for the specific language governing permissions 120Sstevel@tonic-gate * and limitations under the License. 130Sstevel@tonic-gate * 140Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 150Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 160Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 170Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 180Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 190Sstevel@tonic-gate * 200Sstevel@tonic-gate * CDDL HEADER END 210Sstevel@tonic-gate */ 22*1219Sraf 230Sstevel@tonic-gate /* 24*1219Sraf * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 250Sstevel@tonic-gate * Use is subject to license terms. 260Sstevel@tonic-gate */ 270Sstevel@tonic-gate 280Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 290Sstevel@tonic-gate 30*1219Sraf #include "synonyms.h" 310Sstevel@tonic-gate #include <libc.h> 320Sstevel@tonic-gate #include <fcntl.h> 330Sstevel@tonic-gate #include <stdlib.h> 340Sstevel@tonic-gate #include <unistd.h> 350Sstevel@tonic-gate #include <sys/types.h> 360Sstevel@tonic-gate #include <sys/stat.h> 370Sstevel@tonic-gate #include <sys/auxv.h> 380Sstevel@tonic-gate #include <mtlib.h> 390Sstevel@tonic-gate #include <thread.h> 400Sstevel@tonic-gate #include <synch.h> 410Sstevel@tonic-gate 420Sstevel@tonic-gate static mutex_t auxlock = DEFAULTMUTEX; 430Sstevel@tonic-gate 440Sstevel@tonic-gate /* 450Sstevel@tonic-gate * Get auxiliary entry. 460Sstevel@tonic-gate * Returns pointer to entry, or 0 if entry does not exist. 470Sstevel@tonic-gate */ 480Sstevel@tonic-gate static auxv_t * 490Sstevel@tonic-gate _getaux(int type) 500Sstevel@tonic-gate { 510Sstevel@tonic-gate static auxv_t *auxb = NULL; 520Sstevel@tonic-gate static size_t nauxv = 0; 530Sstevel@tonic-gate ssize_t i; 540Sstevel@tonic-gate 550Sstevel@tonic-gate /* 560Sstevel@tonic-gate * The first time through, read the initial aux vector that was 570Sstevel@tonic-gate * passed to the process at exec(2). Only do this once. 580Sstevel@tonic-gate */ 590Sstevel@tonic-gate if (auxb == NULL) { 600Sstevel@tonic-gate struct stat statb; 610Sstevel@tonic-gate int fd; 620Sstevel@tonic-gate 630Sstevel@tonic-gate lmutex_lock(&auxlock); 640Sstevel@tonic-gate 650Sstevel@tonic-gate if (auxb == NULL) { 660Sstevel@tonic-gate if ((fd = open("/proc/self/auxv", O_RDONLY)) != -1 && 670Sstevel@tonic-gate fstat(fd, &statb) != -1) 680Sstevel@tonic-gate auxb = libc_malloc( 690Sstevel@tonic-gate statb.st_size + sizeof (auxv_t)); 700Sstevel@tonic-gate 710Sstevel@tonic-gate if (auxb != NULL) { 720Sstevel@tonic-gate i = read(fd, auxb, statb.st_size); 730Sstevel@tonic-gate if (i != -1) { 740Sstevel@tonic-gate nauxv = i / sizeof (auxv_t); 750Sstevel@tonic-gate auxb[nauxv].a_type = AT_NULL; 760Sstevel@tonic-gate } else { 770Sstevel@tonic-gate libc_free(auxb); 780Sstevel@tonic-gate auxb = NULL; 790Sstevel@tonic-gate } 800Sstevel@tonic-gate } 810Sstevel@tonic-gate 820Sstevel@tonic-gate if (fd != -1) 830Sstevel@tonic-gate (void) close(fd); 840Sstevel@tonic-gate } 850Sstevel@tonic-gate 860Sstevel@tonic-gate lmutex_unlock(&auxlock); 870Sstevel@tonic-gate } 880Sstevel@tonic-gate 890Sstevel@tonic-gate /* 900Sstevel@tonic-gate * Scan the auxiliary entries looking for the required type. 910Sstevel@tonic-gate */ 920Sstevel@tonic-gate for (i = 0; i < nauxv; i++) 930Sstevel@tonic-gate if (auxb[i].a_type == type) 940Sstevel@tonic-gate return (&auxb[i]); 950Sstevel@tonic-gate 960Sstevel@tonic-gate /* 970Sstevel@tonic-gate * No auxiliary array (static executable) or entry not found. 980Sstevel@tonic-gate */ 990Sstevel@tonic-gate return ((auxv_t *)0); 1000Sstevel@tonic-gate } 1010Sstevel@tonic-gate 1020Sstevel@tonic-gate /* 1030Sstevel@tonic-gate * These two routines are utilities exported to the rest of libc. 1040Sstevel@tonic-gate */ 1050Sstevel@tonic-gate 1060Sstevel@tonic-gate long 1070Sstevel@tonic-gate ___getauxval(int type) 1080Sstevel@tonic-gate { 1090Sstevel@tonic-gate auxv_t *auxp; 1100Sstevel@tonic-gate 1110Sstevel@tonic-gate if ((auxp = _getaux(type)) != (auxv_t *)0) 1120Sstevel@tonic-gate return (auxp->a_un.a_val); 1130Sstevel@tonic-gate return (0); 1140Sstevel@tonic-gate } 1150Sstevel@tonic-gate 1160Sstevel@tonic-gate void * 1170Sstevel@tonic-gate ___getauxptr(int type) 1180Sstevel@tonic-gate { 1190Sstevel@tonic-gate auxv_t *auxp; 1200Sstevel@tonic-gate 1210Sstevel@tonic-gate if ((auxp = _getaux(type)) != (auxv_t *)0) 1220Sstevel@tonic-gate return (auxp->a_un.a_ptr); 1230Sstevel@tonic-gate return (0); 1240Sstevel@tonic-gate } 125