author | Norm Jacobs <Norm.Jacobs@Sun.COM> |
Wed, 12 May 2010 00:32:41 -0500 | |
changeset 6 | 20f80c019d73 |
child 16 | 33aaaec59991 |
permissions | -rw-r--r-- |
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/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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* |
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* Copyright (c) 2010, Oracle and/or it's affiliates. All rights reserved. |
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*/ |
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|
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/* |
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* This compiles to a module that can be preloaded during a build. If this |
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* is preloaded, it interposes on time(2) and returns a constant value when |
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* the execname matches one of the desired "programs" and TIME_CONSTANT |
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* contains an integer value to be returned. |
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*/ |
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|
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#include <stdlib.h> |
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#include <ucontext.h> |
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#include <dlfcn.h> |
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#include <strings.h> |
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|
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/* The list of programs that we want to use a constant time. */ |
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static char *programs[] = { "date", "cpp", "cc1", "perl", NULL }; |
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|
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static int |
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stack_info(uintptr_t pc, int signo, void *arg) |
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{ |
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Dl_info info; |
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void *sym; |
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if (dladdr1((void *)pc, &info, &sym, RTLD_DL_SYMENT) != NULL) { |
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*(char **)arg = (char *)info.dli_fname; |
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} |
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return (0); |
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} |
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static char * |
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my_execname() |
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{ |
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static char *execname; |
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if (execname == NULL) { |
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ucontext_t ctx; |
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if (getcontext(&ctx) == 0) |
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walkcontext(&ctx, stack_info, &execname); |
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if (execname != NULL) { |
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char *s = strrchr(execname, '/'); |
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if (s != NULL) |
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execname = ++s; |
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} |
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} |
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return (execname); |
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} |
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static time_t |
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intercept() |
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{ |
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char *execname = my_execname(); |
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time_t result = -1; |
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if (execname != NULL) { |
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int i; |
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for (i = 0; programs[i] != NULL; i++) |
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if (strcmp(execname, programs[i]) == 0) { |
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static char *time_constant; |
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if (time_constant == NULL) |
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time_constant = getenv("TIME_CONSTANT"); |
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if (time_constant != NULL) |
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result = atoll(time_constant); |
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|
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break; |
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} |
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} |
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return (result); |
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} |
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time_t |
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time(time_t *ptr) |
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{ |
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time_t result = intercept(); |
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|
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if (result == (time_t)-1) { |
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static time_t (*fptr)(time_t *); |
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|
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if (fptr == NULL) |
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fptr = (time_t (*)(time_t *))dlsym(RTLD_NEXT, "time"); |
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|
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result = (fptr)(ptr); |
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} else if (ptr != NULL) |
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*ptr = result; |
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|
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return (result); |
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} |