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