diff options
Diffstat (limited to 'libcutils/process_name.c')
-rw-r--r-- | libcutils/process_name.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libcutils/process_name.c b/libcutils/process_name.c new file mode 100644 index 000000000..17f52e269 --- /dev/null +++ b/libcutils/process_name.c @@ -0,0 +1,75 @@ +/* + * 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 <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> + +#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. + char* copy = (char*) malloc(strlen(new_name) + 1); + strcpy(copy, new_name); + process_name = (const char*) copy; + + // 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; +} |