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-rw-r--r--recovery.cpp66
1 files changed, 60 insertions, 6 deletions
diff --git a/recovery.cpp b/recovery.cpp
index e1a2a9678..176ac7a07 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -25,6 +25,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/klog.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
@@ -76,6 +77,8 @@ static const char *CACHE_ROOT = "/cache";
static const char *SDCARD_ROOT = "/sdcard";
static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";
static const char *TEMPORARY_INSTALL_FILE = "/tmp/last_install";
+static const char *LAST_KMSG_FILE = "/cache/recovery/last_kmsg";
+#define KLOG_DEFAULT_LEN (64 * 1024)
#define KEEP_LOG_COUNT 10
@@ -259,6 +262,44 @@ set_sdcard_update_bootloader_message() {
set_bootloader_message(&boot);
}
+// read from kernel log into buffer and write out to file
+static void
+save_kernel_log(const char *destination) {
+ int n;
+ char *buffer;
+ int klog_buf_len;
+ FILE *log;
+
+ klog_buf_len = klogctl(KLOG_SIZE_BUFFER, 0, 0);
+ if (klog_buf_len <= 0) {
+ LOGE("Error getting klog size (%s), using default\n", strerror(errno));
+ klog_buf_len = KLOG_DEFAULT_LEN;
+ }
+
+ buffer = (char *)malloc(klog_buf_len);
+ if (!buffer) {
+ LOGE("Can't alloc %d bytes for klog buffer\n", klog_buf_len);
+ return;
+ }
+
+ n = klogctl(KLOG_READ_ALL, buffer, klog_buf_len);
+ if (n < 0) {
+ LOGE("Error in reading klog (%s)\n", strerror(errno));
+ free(buffer);
+ return;
+ }
+
+ log = fopen_path(destination, "w");
+ if (log == NULL) {
+ LOGE("Can't open %s\n", destination);
+ free(buffer);
+ return;
+ }
+ fwrite(buffer, n, 1, log);
+ check_and_fclose(log, destination);
+ free(buffer);
+}
+
// How much of the temp log we have copied to the copy in cache.
static long tmplog_offset = 0;
@@ -306,8 +347,11 @@ copy_logs() {
copy_log_file(TEMPORARY_LOG_FILE, LOG_FILE, true);
copy_log_file(TEMPORARY_LOG_FILE, LAST_LOG_FILE, false);
copy_log_file(TEMPORARY_INSTALL_FILE, LAST_INSTALL_FILE, false);
+ save_kernel_log(LAST_KMSG_FILE);
chmod(LOG_FILE, 0600);
chown(LOG_FILE, 1000, 1000); // system user
+ chmod(LAST_KMSG_FILE, 0600);
+ chown(LAST_KMSG_FILE, 1000, 1000); // system user
chmod(LAST_LOG_FILE, 0640);
chmod(LAST_INSTALL_FILE, 0644);
sync();
@@ -695,15 +739,26 @@ static void file_to_ui(const char* fn) {
}
static void choose_recovery_file(Device* device) {
- int i;
+ unsigned int i;
+ unsigned int n;
static const char** title_headers = NULL;
char *filename;
const char* headers[] = { "Select file to view",
"",
NULL };
- char* entries[KEEP_LOG_COUNT + 2];
+ // "Go back" + LAST_KMSG_FILE + KEEP_LOG_COUNT + terminating NULL entry
+ char* entries[KEEP_LOG_COUNT + 3];
memset(entries, 0, sizeof(entries));
+ n = 0;
+ entries[n++] = strdup("Go back");
+
+ // Add kernel kmsg file if available
+ if ((ensure_path_mounted(LAST_KMSG_FILE) == 0) && (access(LAST_KMSG_FILE, R_OK) == 0)) {
+ entries[n++] = strdup(LAST_KMSG_FILE);
+ }
+
+ // Add LAST_LOG_FILE + LAST_LOG_FILE.x
for (i = 0; i < KEEP_LOG_COUNT; i++) {
char *filename;
if (asprintf(&filename, (i==0) ? LAST_LOG_FILE : (LAST_LOG_FILE ".%d"), i) == -1) {
@@ -712,13 +767,12 @@ static void choose_recovery_file(Device* device) {
}
if ((ensure_path_mounted(filename) != 0) || (access(filename, R_OK) == -1)) {
free(filename);
- entries[i+1] = NULL;
+ entries[n++] = NULL;
break;
}
- entries[i+1] = filename;
+ entries[n++] = filename;
}
- entries[0] = strdup("Go back");
title_headers = prepend_title((const char**)headers);
while(1) {
@@ -727,7 +781,7 @@ static void choose_recovery_file(Device* device) {
file_to_ui(entries[chosen_item]);
}
- for (i = 0; i < KEEP_LOG_COUNT + 1; i++) {
+ for (i = 0; i < (sizeof(entries) / sizeof(*entries)); i++) {
free(entries[i]);
}
}