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- /*
- * 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 <stdlib.h>
- #include <string.h>
- #include <cutils/process_name.h>
- #include <cutils/properties.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #if defined(HAVE_PRCTL)
- #include <sys/prctl.h>
- #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;
- }
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