implement LOG_EVENT_STRING

Implement LOG_EVENT_STRING, so that native code can create new
event log entries. This is needed to support logging SELinux denials
to the event log.

Change-Id: I6a269a832bc2f5e5da6c9dbd169ed2f901b49166

2 files changed, 44 insertions, 0 deletions

diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index f10eb8e..1da55ab 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -473,3 +473,25 @@ int __android_log_btwrite(int32_t tag, char type, const void *payload,
 
     return write_to_log(LOG_ID_EVENTS, vec, 3);
 }
+
+/*
+ * Like __android_log_bwrite, but used for writing strings to the
+ * event log.
+ */
+int __android_log_bswrite(int32_t tag, const char *payload)
+{
+    struct iovec vec[4];
+    char type = EVENT_TYPE_STRING;
+    uint32_t len = strlen(payload);
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = &type;
+    vec[1].iov_len = sizeof(type);
+    vec[2].iov_base = &len;
+    vec[2].iov_len = sizeof(len);
+    vec[3].iov_base = (void*)payload;
+    vec[3].iov_len = len;
+
+    return write_to_log(LOG_ID_EVENTS, vec, 4);
+}
diff --git a/liblog/logd_write_kern.c b/liblog/logd_write_kern.c
index 1d10748..1ed5ecf 100644
--- a/liblog/logd_write_kern.c
+++ b/liblog/logd_write_kern.c
@@ -317,3 +317,25 @@ int __android_log_btwrite(int32_t tag, char type, const void *payload,
 
     return write_to_log(LOG_ID_EVENTS, vec, 3);
 }
+
+/*
+ * Like __android_log_bwrite, but used for writing strings to the
+ * event log.
+ */
+int __android_log_bswrite(int32_t tag, const char *payload)
+{
+    struct iovec vec[4];
+    char type = EVENT_TYPE_STRING;
+    uint32_t len = strlen(payload);
+
+    vec[0].iov_base = &tag;
+    vec[0].iov_len = sizeof(tag);
+    vec[1].iov_base = &type;
+    vec[1].iov_len = sizeof(type);
+    vec[2].iov_base = &len;
+    vec[2].iov_len = sizeof(len);
+    vec[3].iov_base = (void*)payload;
+    vec[3].iov_len = len;
+
+    return write_to_log(LOG_ID_EVENTS, vec, 4);
+}