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1 /*
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2 * Copyright 2003-2007 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #include <errno.h>
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29 #include <sys/ptrace.h>
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30 #include "libproc_impl.h"
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31
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32 #if defined(x86_64) && !defined(amd64)
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33 #define amd64 1
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34 #endif
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35
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36 #ifndef __WALL
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37 #define __WALL 0x40000000 // Copied from /usr/include/linux/wait.h
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38 #endif
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39
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40 // This file has the libproc implementation specific to live process
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41 // For core files, refer to ps_core.c
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42
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43 static inline uintptr_t align(uintptr_t ptr, size_t size) {
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44 return (ptr & ~(size - 1));
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45 }
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46
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47 // ---------------------------------------------
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48 // ptrace functions
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49 // ---------------------------------------------
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50
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51 // read "size" bytes of data from "addr" within the target process.
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52 // unlike the standard ptrace() function, process_read_data() can handle
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53 // unaligned address - alignment check, if required, should be done
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54 // before calling process_read_data.
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55
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56 static bool process_read_data(struct ps_prochandle* ph, uintptr_t addr, char *buf, size_t size) {
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57 long rslt;
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58 size_t i, words;
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59 uintptr_t end_addr = addr + size;
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60 uintptr_t aligned_addr = align(addr, sizeof(long));
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61
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62 if (aligned_addr != addr) {
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63 char *ptr = (char *)&rslt;
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64 errno = 0;
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65 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0);
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66 if (errno) {
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67 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr);
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68 return false;
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69 }
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70 for (; aligned_addr != addr; aligned_addr++, ptr++);
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71 for (; ((intptr_t)aligned_addr % sizeof(long)) && aligned_addr < end_addr;
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72 aligned_addr++)
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73 *(buf++) = *(ptr++);
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74 }
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75
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76 words = (end_addr - aligned_addr) / sizeof(long);
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77
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78 // assert((intptr_t)aligned_addr % sizeof(long) == 0);
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79 for (i = 0; i < words; i++) {
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80 errno = 0;
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81 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0);
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82 if (errno) {
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83 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr);
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84 return false;
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85 }
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86 *(long *)buf = rslt;
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87 buf += sizeof(long);
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88 aligned_addr += sizeof(long);
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89 }
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90
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91 if (aligned_addr != end_addr) {
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92 char *ptr = (char *)&rslt;
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93 errno = 0;
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94 rslt = ptrace(PTRACE_PEEKDATA, ph->pid, aligned_addr, 0);
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95 if (errno) {
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96 print_debug("ptrace(PTRACE_PEEKDATA, ..) failed for %d bytes @ %lx\n", size, addr);
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97 return false;
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98 }
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99 for (; aligned_addr != end_addr; aligned_addr++)
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100 *(buf++) = *(ptr++);
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101 }
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102 return true;
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103 }
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104
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105 // null implementation for write
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106 static bool process_write_data(struct ps_prochandle* ph,
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107 uintptr_t addr, const char *buf , size_t size) {
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108 return false;
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109 }
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110
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111 // "user" should be a pointer to a user_regs_struct
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112 static bool process_get_lwp_regs(struct ps_prochandle* ph, pid_t pid, struct user_regs_struct *user) {
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113 // we have already attached to all thread 'pid's, just use ptrace call
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114 // to get regset now. Note that we don't cache regset upfront for processes.
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115 // Linux on x86 and sparc are different. On x86 ptrace(PTRACE_GETREGS, ...)
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116 // uses pointer from 4th argument and ignores 3rd argument. On sparc it uses
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117 // pointer from 3rd argument and ignores 4th argument
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118 #if defined(sparc) || defined(sparcv9)
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119 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, addr, data)
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120 #else
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121 #define ptrace_getregs(request, pid, addr, data) ptrace(request, pid, data, addr)
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122 #endif
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123
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124 #ifdef _LP64
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125 #ifdef PTRACE_GETREGS64
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126 #define PTRACE_GETREGS_REQ PTRACE_GETREGS64
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127 #endif
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128 #else
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129 #if defined(PTRACE_GETREGS) || defined(PT_GETREGS)
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130 #define PTRACE_GETREGS_REQ PTRACE_GETREGS
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131 #endif
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132 #endif /* _LP64 */
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133
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134 #ifdef PTRACE_GETREGS_REQ
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135 if (ptrace_getregs(PTRACE_GETREGS_REQ, pid, user, NULL) < 0) {
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136 print_debug("ptrace(PTRACE_GETREGS, ...) failed for lwp %d\n", pid);
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137 return false;
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138 }
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139 return true;
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140 #else
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141 print_debug("ptrace(PTRACE_GETREGS, ...) not supported\n");
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142 return false;
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143 #endif
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144
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145 }
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146
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147 // attach to a process/thread specified by "pid"
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148 static bool ptrace_attach(pid_t pid) {
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149 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) {
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150 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid);
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151 return false;
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152 } else {
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153 int ret;
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154 int status;
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155 do {
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156 // Wait for debuggee to stop.
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157 ret = waitpid(pid, &status, 0);
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158 if (ret == -1 && errno == ECHILD) {
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159 // try cloned process.
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160 ret = waitpid(pid, &status, __WALL);
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161 }
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162 if (ret >= 0) {
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163 if (WIFSTOPPED(status)) {
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164 // Debuggee stopped.
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165 return true;
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166 } else {
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167 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status);
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168 return false;
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169 }
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170 } else {
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171 switch (errno) {
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172 case EINTR:
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173 continue;
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174 break;
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175 case ECHILD:
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176 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid);
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177 break;
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178 case EINVAL:
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179 print_debug("waitpid() failed. Invalid options argument.\n");
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180 break;
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181 default:
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182 print_debug("waitpid() failed. Unexpected error %d\n",errno);
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183 }
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184 return false;
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185 }
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186 } while(true);
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187 }
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188 }
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189
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190 // -------------------------------------------------------
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191 // functions for obtaining library information
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192 // -------------------------------------------------------
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193
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194 /*
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195 * splits a string _str_ into substrings with delimiter _delim_ by replacing old * delimiters with _new_delim_ (ideally, '\0'). the address of each substring
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196 * is stored in array _ptrs_ as the return value. the maximum capacity of _ptrs_ * array is specified by parameter _n_.
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197 * RETURN VALUE: total number of substrings (always <= _n_)
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198 * NOTE: string _str_ is modified if _delim_!=_new_delim_
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199 */
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200 static int split_n_str(char * str, int n, char ** ptrs, char delim, char new_delim)
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201 {
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202 int i;
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203 for(i = 0; i < n; i++) ptrs[i] = NULL;
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204 if (str == NULL || n < 1 ) return 0;
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205
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206 i = 0;
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207
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208 // skipping leading blanks
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209 while(*str&&*str==delim) str++;
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210
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211 while(*str&&i<n){
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212 ptrs[i++] = str;
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213 while(*str&&*str!=delim) str++;
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214 while(*str&&*str==delim) *(str++) = new_delim;
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215 }
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216
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217 return i;
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218 }
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219
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220 /*
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221 * fgets without storing '\n' at the end of the string
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222 */
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223 static char * fgets_no_cr(char * buf, int n, FILE *fp)
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224 {
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225 char * rslt = fgets(buf, n, fp);
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226 if (rslt && buf && *buf){
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227 char *p = strchr(buf, '\0');
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228 if (*--p=='\n') *p='\0';
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229 }
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230 return rslt;
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231 }
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232
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233 // callback for read_thread_info
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234 static bool add_new_thread(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
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235 return add_thread_info(ph, pthread_id, lwp_id) != NULL;
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236 }
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237
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238 static bool read_lib_info(struct ps_prochandle* ph) {
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239 char fname[32];
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240 char buf[256];
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241 FILE *fp = NULL;
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242
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243 sprintf(fname, "/proc/%d/maps", ph->pid);
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244 fp = fopen(fname, "r");
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245 if (fp == NULL) {
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246 print_debug("can't open /proc/%d/maps file\n", ph->pid);
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247 return false;
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248 }
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249
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250 while(fgets_no_cr(buf, 256, fp)){
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251 char * word[6];
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252 int nwords = split_n_str(buf, 6, word, ' ', '\0');
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253 if (nwords > 5 && find_lib(ph, word[5]) == false) {
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254 intptr_t base;
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255 lib_info* lib;
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256 sscanf(word[0], "%lx", &base);
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257 if ((lib = add_lib_info(ph, word[5], (uintptr_t)base)) == NULL)
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258 continue; // ignore, add_lib_info prints error
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259
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260 // we don't need to keep the library open, symtab is already
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261 // built. Only for core dump we need to keep the fd open.
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262 close(lib->fd);
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263 lib->fd = -1;
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264 }
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265 }
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266 fclose(fp);
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267 return true;
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268 }
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269
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270 // detach a given pid
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271 static bool ptrace_detach(pid_t pid) {
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272 if (pid && ptrace(PTRACE_DETACH, pid, NULL, NULL) < 0) {
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273 print_debug("ptrace(PTRACE_DETACH, ..) failed for %d\n", pid);
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274 return false;
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275 } else {
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276 return true;
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277 }
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278 }
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279
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280 // detach all pids of a ps_prochandle
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281 static void detach_all_pids(struct ps_prochandle* ph) {
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282 thread_info* thr = ph->threads;
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283 while (thr) {
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284 ptrace_detach(thr->lwp_id);
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285 thr = thr->next;
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286 }
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287 }
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288
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289 static void process_cleanup(struct ps_prochandle* ph) {
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290 detach_all_pids(ph);
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291 }
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292
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293 static ps_prochandle_ops process_ops = {
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294 release: process_cleanup,
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295 p_pread: process_read_data,
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296 p_pwrite: process_write_data,
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297 get_lwp_regs: process_get_lwp_regs
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298 };
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299
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300 // attach to the process. One and only one exposed stuff
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301 struct ps_prochandle* Pgrab(pid_t pid) {
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302 struct ps_prochandle* ph = NULL;
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303 thread_info* thr = NULL;
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304
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305 if ( (ph = (struct ps_prochandle*) calloc(1, sizeof(struct ps_prochandle))) == NULL) {
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306 print_debug("can't allocate memory for ps_prochandle\n");
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307 return NULL;
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308 }
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309
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310 if (ptrace_attach(pid) != true) {
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311 free(ph);
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312 return NULL;
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313 }
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314
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315 // initialize ps_prochandle
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316 ph->pid = pid;
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317
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318 // initialize vtable
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319 ph->ops = &process_ops;
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320
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321 // read library info and symbol tables, must do this before attaching threads,
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322 // as the symbols in the pthread library will be used to figure out
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323 // the list of threads within the same process.
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324 read_lib_info(ph);
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325
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326 // read thread info
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327 read_thread_info(ph, add_new_thread);
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328
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329 // attach to the threads
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330 thr = ph->threads;
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331 while (thr) {
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332 // don't attach to the main thread again
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333 if (ph->pid != thr->lwp_id && ptrace_attach(thr->lwp_id) != true) {
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334 // even if one attach fails, we get return NULL
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335 Prelease(ph);
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336 return NULL;
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337 }
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338 thr = thr->next;
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339 }
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340 return ph;
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341 }
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