Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: agent/src/os/linux/ps_proc.c
agent/src/os/linux/ps_proc.c
- changeset 4599
- 2394a89e89f4
- parent 2384
- 0a8e0d4345b3
- child 5797
- f2512d89ad0c
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| 4598:7adae9244bc8 | 4599:2394a89e89f4 |
|---|---|
| 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. |
| 23 */ | 23 */ |
| 24 | 24 |
| 25 #include <stdio.h> | 25 #include <stdio.h> |
| 26 #include <stdlib.h> | 26 #include <stdlib.h> |
| 27 #include <string.h> | 27 #include <string.h> |
| 28 #include <signal.h> | |
| 28 #include <errno.h> | 29 #include <errno.h> |
| 29 #include <sys/ptrace.h> | 30 #include <sys/ptrace.h> |
| 30 #include "libproc_impl.h" | 31 #include "libproc_impl.h" |
| 31 | 32 |
| 32 #if defined(x86_64) && !defined(amd64) | 33 #if defined(x86_64) && !defined(amd64) |
| 140 return false; | 141 return false; |
| 141 #endif | 142 #endif |
| 142 | 143 |
| 143 } | 144 } |
| 144 | 145 |
| 146 static bool ptrace_continue(pid_t pid, int signal) { | |
| 147 // pass the signal to the process so we don't swallow it | |
| 148 if (ptrace(PTRACE_CONT, pid, NULL, signal) < 0) { | |
| 149 print_debug("ptrace(PTRACE_CONT, ..) failed for %d\n", pid); | |
| 150 return false; | |
| 151 } | |
| 152 return true; | |
| 153 } | |
| 154 | |
| 155 // waits until the ATTACH has stopped the process | |
| 156 // by signal SIGSTOP | |
| 157 static bool ptrace_waitpid(pid_t pid) { | |
| 158 int ret; | |
| 159 int status; | |
| 160 while (true) { | |
| 161 // Wait for debuggee to stop. | |
| 162 ret = waitpid(pid, &status, 0); | |
| 163 if (ret == -1 && errno == ECHILD) { | |
| 164 // try cloned process. | |
| 165 ret = waitpid(pid, &status, __WALL); | |
| 166 } | |
| 167 if (ret >= 0) { | |
| 168 if (WIFSTOPPED(status)) { | |
| 169 // Any signal will stop the thread, make sure it is SIGSTOP. Otherwise SIGSTOP | |
| 170 // will still be pending and delivered when the process is DETACHED and the process | |
| 171 // will go to sleep. | |
| 172 if (WSTOPSIG(status) == SIGSTOP) { | |
| 173 // Debuggee stopped by SIGSTOP. | |
| 174 return true; | |
| 175 } | |
| 176 if (!ptrace_continue(pid, WSTOPSIG(status))) { | |
| 177 print_error("Failed to correctly attach to VM. VM might HANG! [PTRACE_CONT failed, stopped by %d]\n", WSTOPSIG(status)); | |
| 178 return false; | |
| 179 } | |
| 180 } else { | |
| 181 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status); | |
| 182 return false; | |
| 183 } | |
| 184 } else { | |
| 185 switch (errno) { | |
| 186 case EINTR: | |
| 187 continue; | |
| 188 break; | |
| 189 case ECHILD: | |
| 190 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid); | |
| 191 break; | |
| 192 case EINVAL: | |
| 193 print_debug("waitpid() failed. Invalid options argument.\n"); | |
| 194 break; | |
| 195 default: | |
| 196 print_debug("waitpid() failed. Unexpected error %d\n",errno); | |
| 197 break; | |
| 198 } | |
| 199 return false; | |
| 200 } | |
| 201 } | |
| 202 } | |
| 203 | |
| 145 // attach to a process/thread specified by "pid" | 204 // attach to a process/thread specified by "pid" |
| 146 static bool ptrace_attach(pid_t pid) { | 205 static bool ptrace_attach(pid_t pid) { |
| 147 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { | 206 if (ptrace(PTRACE_ATTACH, pid, NULL, NULL) < 0) { |
| 148 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); | 207 print_debug("ptrace(PTRACE_ATTACH, ..) failed for %d\n", pid); |
| 149 return false; | 208 return false; |
| 150 } else { | 209 } else { |
| 151 int ret; | 210 return ptrace_waitpid(pid); |
| 152 int status; | |
| 153 do { | |
| 154 // Wait for debuggee to stop. | |
| 155 ret = waitpid(pid, &status, 0); | |
| 156 if (ret == -1 && errno == ECHILD) { | |
| 157 // try cloned process. | |
| 158 ret = waitpid(pid, &status, __WALL); | |
| 159 } | |
| 160 if (ret >= 0) { | |
| 161 if (WIFSTOPPED(status)) { | |
| 162 // Debuggee stopped. | |
| 163 return true; | |
| 164 } else { | |
| 165 print_debug("waitpid(): Child process exited/terminated (status = 0x%x)\n", status); | |
| 166 return false; | |
| 167 } | |
| 168 } else { | |
| 169 switch (errno) { | |
| 170 case EINTR: | |
| 171 continue; | |
| 172 break; | |
| 173 case ECHILD: | |
| 174 print_debug("waitpid() failed. Child process pid (%d) does not exist \n", pid); | |
| 175 break; | |
| 176 case EINVAL: | |
| 177 print_debug("waitpid() failed. Invalid options argument.\n"); | |
| 178 break; | |
| 179 default: | |
| 180 print_debug("waitpid() failed. Unexpected error %d\n",errno); | |
| 181 } | |
| 182 return false; | |
| 183 } | |
| 184 } while(true); | |
| 185 } | 211 } |
| 186 } | 212 } |
| 187 | 213 |
| 188 // ------------------------------------------------------- | 214 // ------------------------------------------------------- |
| 189 // functions for obtaining library information | 215 // functions for obtaining library information |
