Initial Contribution

1 files changed, 75 insertions, 0 deletions

diff --git a/libcutils/process_name.c b/libcutils/process_name.c
new file mode 100644
index 0000000..17f52e2
--- /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;
+}