/* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #if defined(HAVE_PRCTL) #include #endif #define PROCESS_NAME_DEVICE "/sys/qemu_trace/process_name" static const char* process_name = "unknown"; static int running_in_emulator = -1; void set_process_name(const char* new_name) { char propBuf[PROPERTY_VALUE_MAX]; if (new_name == NULL) { return; } // We never free the old name. Someone else could be using it. int len = strlen(new_name); char* copy = (char*) malloc(len + 1); strcpy(copy, new_name); process_name = (const char*) copy; #if defined(HAVE_PRCTL) if (len < 16) { prctl(PR_SET_NAME, (unsigned long) new_name, 0, 0, 0); } else { prctl(PR_SET_NAME, (unsigned long) new_name + len - 15, 0, 0, 0); } #endif // If we know we are not running in the emulator, then return. if (running_in_emulator == 0) { return; } // If the "running_in_emulator" variable has not been initialized, // then do it now. if (running_in_emulator == -1) { property_get("ro.kernel.qemu", propBuf, ""); if (propBuf[0] == '1') { running_in_emulator = 1; } else { running_in_emulator = 0; return; } } // If the emulator was started with the "-trace file" command line option // then we want to record the process name in the trace even if we are // not currently tracing instructions (so that we will know the process // name when we do start tracing instructions). We do not need to execute // this code if we are just running in the emulator without the "-trace" // command line option, but we don't know that here and this function // isn't called frequently enough to bother optimizing that case. int fd = open(PROCESS_NAME_DEVICE, O_RDWR); if (fd < 0) return; write(fd, process_name, strlen(process_name) + 1); close(fd); } const char* get_process_name(void) { return process_name; }