1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <string.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <dlfcn.h> 34 #include <apptrace.h> 35 #include <assert.h> 36 #include "abienv.h" 37 38 #define NOTID 0xffffffff 39 40 /* 41 * This file is meant to contain support functions 42 * for interceptors. They are built into the auditing 43 * object making the namespace available to "children" 44 * objects. 45 */ 46 47 static lwp_mutex_t abi_stdio_mutex = DEFAULTMUTEX; 48 static volatile thread_t locktid = NOTID; 49 static volatile int count; 50 51 size_t 52 strnlen(const char *s, size_t n) 53 { 54 char *ptr; 55 56 if (s == NULL) 57 return (n); 58 ptr = memchr(s, 0, n); 59 if (ptr == NULL) 60 return (n); 61 62 return ((ptr - s) + 1); 63 } 64 65 /* Return true on empty */ 66 int 67 is_empty_string(char const *s) 68 { 69 if (s != NULL && *s != '\0') 70 return (0); 71 72 return (1); 73 } 74 75 void 76 abilock(sigset_t *mask) 77 { 78 thread_t tid; 79 80 if ((*abi_thr_main)() != -1) { 81 tid = (*abi_thr_self)(); 82 83 if (tid == locktid) { 84 count++; 85 } else { 86 (void) _lwp_mutex_lock(&abi_stdio_mutex); 87 (void) sigprocmask(SIG_BLOCK, &abisigset, mask); 88 locktid = tid; 89 count = 1; 90 } 91 } 92 } 93 94 void 95 abiunlock(sigset_t *mask) 96 { 97 thread_t tid; 98 99 (void) fflush(ABISTREAM); 100 101 if ((*abi_thr_main)() != -1) { 102 tid = (*abi_thr_self)(); 103 assert(tid == locktid); 104 count--; 105 if (count <= 0) { 106 count = 0; 107 locktid = NOTID; 108 (void) sigprocmask(SIG_SETMASK, mask, NULL); 109 (void) _lwp_mutex_unlock(&abi_stdio_mutex); 110 } 111 } 112 } 113