The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <string.h> |
| 18 | #include <cutils/process_name.h> |
| 19 | #include <cutils/properties.h> |
| 20 | #include <unistd.h> |
| 21 | #include <sys/types.h> |
| 22 | #include <sys/stat.h> |
| 23 | #include <fcntl.h> |
| 24 | |
Erik Gilling | f6eba8f | 2009-10-27 21:27:33 -0700 | [diff] [blame] | 25 | #if defined(HAVE_PRCTL) |
| 26 | #include <sys/prctl.h> |
| 27 | #endif |
| 28 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 29 | #define PROCESS_NAME_DEVICE "/sys/qemu_trace/process_name" |
| 30 | |
| 31 | static const char* process_name = "unknown"; |
| 32 | static int running_in_emulator = -1; |
| 33 | |
| 34 | void set_process_name(const char* new_name) { |
| 35 | char propBuf[PROPERTY_VALUE_MAX]; |
| 36 | |
| 37 | if (new_name == NULL) { |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | // We never free the old name. Someone else could be using it. |
Erik Gilling | f6eba8f | 2009-10-27 21:27:33 -0700 | [diff] [blame] | 42 | int len = strlen(new_name); |
| 43 | char* copy = (char*) malloc(len + 1); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 44 | strcpy(copy, new_name); |
| 45 | process_name = (const char*) copy; |
| 46 | |
Erik Gilling | f6eba8f | 2009-10-27 21:27:33 -0700 | [diff] [blame] | 47 | #if defined(HAVE_PRCTL) |
| 48 | if (len < 16) { |
| 49 | prctl(PR_SET_NAME, (unsigned long) new_name, 0, 0, 0); |
| 50 | } else { |
| 51 | prctl(PR_SET_NAME, (unsigned long) new_name + len - 15, 0, 0, 0); |
| 52 | } |
| 53 | #endif |
| 54 | |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 55 | // If we know we are not running in the emulator, then return. |
| 56 | if (running_in_emulator == 0) { |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | // If the "running_in_emulator" variable has not been initialized, |
| 61 | // then do it now. |
| 62 | if (running_in_emulator == -1) { |
| 63 | property_get("ro.kernel.qemu", propBuf, ""); |
| 64 | if (propBuf[0] == '1') { |
| 65 | running_in_emulator = 1; |
| 66 | } else { |
| 67 | running_in_emulator = 0; |
| 68 | return; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | // If the emulator was started with the "-trace file" command line option |
| 73 | // then we want to record the process name in the trace even if we are |
| 74 | // not currently tracing instructions (so that we will know the process |
| 75 | // name when we do start tracing instructions). We do not need to execute |
| 76 | // this code if we are just running in the emulator without the "-trace" |
| 77 | // command line option, but we don't know that here and this function |
| 78 | // isn't called frequently enough to bother optimizing that case. |
| 79 | int fd = open(PROCESS_NAME_DEVICE, O_RDWR); |
| 80 | if (fd < 0) |
| 81 | return; |
| 82 | write(fd, process_name, strlen(process_name) + 1); |
| 83 | close(fd); |
| 84 | } |
| 85 | |
| 86 | const char* get_process_name(void) { |
| 87 | return process_name; |
| 88 | } |