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comparison agent/src/os/bsd/ps_proc.c @ 8058:2394a89e89f4

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8008088: SA can hang the VM Reviewed-by: mgronlun, sla, dholmes
author rbackman
date Wed, 13 Feb 2013 09:46:19 +0100
parents f08d439fab8c
children 1a04de1aaedb
comparison
equal deleted inserted replaced
8057:7adae9244bc8 8058:2394a89e89f4
1 /* 1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
127 ptrace(PT_LWPINFO, lwp_id, linfo, sizeof(struct ptrace_lwpinfo)); 127 ptrace(PT_LWPINFO, lwp_id, linfo, sizeof(struct ptrace_lwpinfo));
128 128
129 return (errno == 0)? true: false; 129 return (errno == 0)? true: false;
130 } 130 }
131 131
132 static bool ptrace_continue(pid_t pid, int signal) {
133 // pass the signal to the process so we don't swallow it
134 if (ptrace(PTRACE_CONT, pid, NULL, signal) < 0) {
135 print_debug("ptrace(PTRACE_CONT, ..) failed for %d\n", pid);
136 return false;
137 }
138 return true;
139 }
140
141 // waits until the ATTACH has stopped the process
142 // by signal SIGSTOP
143 static bool ptrace_waitpid(pid_t pid) {
144 int ret;
145 int status;
146 do {
147 // Wait for debuggee to stop.
148 ret = waitpid(pid, &status, 0);
149 if (ret >= 0) {
150 if (WIFSTOPPED(status)) {
151 // Any signal will stop the thread, make sure it is SIGSTOP. Otherwise SIGSTOP
152 // will still be pending and delivered when the process is DETACHED and the process
153 // will go to sleep.
154 if (WSTOPSIG(status) == SIGSTOP) {
155 // Debuggee stopped by SIGSTOP.
156 return true;
157 }
158 if (!ptrace_continue(pid, WSTOPSIG(status))) {
159 print_error("Failed to correctly attach to VM. VM might HANG! [PTRACE_CONT failed, stopped by %d]\n", WSTOPSIG(status));
160 return false;
161 }
162 } else {
163 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status);
164 return false;
165 }
166 } else {
167 switch (errno) {
168 case EINTR:
169 continue;
170 break;
171 case ECHILD:
172 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid);
173 break;
174 case EINVAL:
175 print_debug("waitpid() failed. Invalid options argument.\n");
176 break;
177 default:
178 print_debug("waitpid() failed. Unexpected error %d\n",errno);
179 }
180 return false;
181 }
182 } while(true);
183 }
184
132 // attach to a process/thread specified by "pid" 185 // attach to a process/thread specified by "pid"
133 static bool ptrace_attach(pid_t pid) { 186 static bool ptrace_attach(pid_t pid) {
134 if (ptrace(PT_ATTACH, pid, NULL, 0) < 0) { 187 if (ptrace(PT_ATTACH, pid, NULL, 0) < 0) {
135 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); 188 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid);
136 return false; 189 return false;
137 } else { 190 } else {
138 int ret; 191 return ptrace_waitpid(pid);
139 int status;
140 do {
141 // Wait for debuggee to stop.
142 ret = waitpid(pid, &status, 0);
143 if (ret >= 0) {
144 if (WIFSTOPPED(status)) {
145 // Debuggee stopped.
146 return true;
147 } else {
148 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status);
149 return false;
150 }
151 } else {
152 switch (errno) {
153 case EINTR:
154 continue;
155 break;
156 case ECHILD:
157 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid);
158 break;
159 case EINVAL:
160 print_debug("waitpid() failed. Invalid options argument.\n");
161 break;
162 default:
163 print_debug("waitpid() failed. Unexpected error %d\n",errno);
164 }
165 return false;
166 }
167 } while(true);
168 } 192 }
169 } 193 }
170 194
171 // ------------------------------------------------------- 195 // -------------------------------------------------------
172 // functions for obtaining library information 196 // functions for obtaining library information