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-rw-r--r--src/deps_log.cc72
1 files changed, 44 insertions, 28 deletions
diff --git a/src/deps_log.cc b/src/deps_log.cc
index cf55194..db8f071 100644
--- a/src/deps_log.cc
+++ b/src/deps_log.cc
@@ -49,34 +49,9 @@ bool DepsLog::OpenForWrite(const string& path, string* err) {
return false;
}
- file_ = fopen(path.c_str(), "ab");
- if (!file_) {
- *err = strerror(errno);
- return false;
- }
- // Set the buffer size to this and flush the file buffer after every record
- // to make sure records aren't written partially.
- setvbuf(file_, NULL, _IOFBF, kMaxRecordSize + 1);
- SetCloseOnExec(fileno(file_));
-
- // Opening a file in append mode doesn't set the file pointer to the file's
- // end on Windows. Do that explicitly.
- fseek(file_, 0, SEEK_END);
-
- if (ftell(file_) == 0) {
- if (fwrite(kFileSignature, sizeof(kFileSignature) - 1, 1, file_) < 1) {
- *err = strerror(errno);
- return false;
- }
- if (fwrite(&kCurrentVersion, 4, 1, file_) < 1) {
- *err = strerror(errno);
- return false;
- }
- }
- if (fflush(file_) != 0) {
- *err = strerror(errno);
- return false;
- }
+ assert(!file_);
+ file_path_ = path; // we don't actually open the file right now, but will do
+ // so on the first write attempt
return true;
}
@@ -132,6 +107,10 @@ bool DepsLog::RecordDeps(Node* node, TimeStamp mtime,
errno = ERANGE;
return false;
}
+
+ if (!OpenForWriteIfNeeded()) {
+ return false;
+ }
size |= 0x80000000; // Deps record: set high bit.
if (fwrite(&size, 4, 1, file_) < 1)
return false;
@@ -162,6 +141,7 @@ bool DepsLog::RecordDeps(Node* node, TimeStamp mtime,
}
void DepsLog::Close() {
+ OpenForWriteIfNeeded(); // create the file even if nothing has been recorded
if (file_)
fclose(file_);
file_ = NULL;
@@ -396,6 +376,10 @@ bool DepsLog::RecordId(Node* node) {
errno = ERANGE;
return false;
}
+
+ if (!OpenForWriteIfNeeded()) {
+ return false;
+ }
if (fwrite(&size, 4, 1, file_) < 1)
return false;
if (fwrite(node->path().data(), path_size, 1, file_) < 1) {
@@ -416,3 +400,35 @@ bool DepsLog::RecordId(Node* node) {
return true;
}
+
+bool DepsLog::OpenForWriteIfNeeded() {
+ if (file_path_.empty()) {
+ return true;
+ }
+ file_ = fopen(file_path_.c_str(), "ab");
+ if (!file_) {
+ return false;
+ }
+ // Set the buffer size to this and flush the file buffer after every record
+ // to make sure records aren't written partially.
+ setvbuf(file_, NULL, _IOFBF, kMaxRecordSize + 1);
+ SetCloseOnExec(fileno(file_));
+
+ // Opening a file in append mode doesn't set the file pointer to the file's
+ // end on Windows. Do that explicitly.
+ fseek(file_, 0, SEEK_END);
+
+ if (ftell(file_) == 0) {
+ if (fwrite(kFileSignature, sizeof(kFileSignature) - 1, 1, file_) < 1) {
+ return false;
+ }
+ if (fwrite(&kCurrentVersion, 4, 1, file_) < 1) {
+ return false;
+ }
+ }
+ if (fflush(file_) != 0) {
+ return false;
+ }
+ file_path_.clear();
+ return true;
+}