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io/FileOutputStream: add method Sync()

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This commit is contained in:
Max Kellermann 2022-05-12 16:49:15 +02:00
parent 47d103e8a1
commit 270a74e53b
2 changed files with 27 additions and 0 deletions
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18
src/io/FileOutputStream.cxx
View File

@ -138,6 +138,15 @@ FileOutputStream::Write(const void *data, size_t size)
GetPath().c_str()); GetPath().c_str());
} }
void
FileOutputStream::Sync()
{
assert(IsDefined());
if (!FlushFileBuffers(handle))
throw FormatLastError("Failed to sync %s", GetPath().c_str());
}
void void
FileOutputStream::Commit() FileOutputStream::Commit()
{ {
@ -240,6 +249,15 @@ FileOutputStream::Write(const void *data, size_t size)
GetPath().c_str()); GetPath().c_str());
} }
void
FileOutputStream::Sync()
{
assert(IsDefined());
if (fdatasync(fd.Get()) < 0)
throw FormatErrno("Failed to sync %s", GetPath().c_str());
}
void void
FileOutputStream::Commit() FileOutputStream::Commit()
{ {

9
src/io/FileOutputStream.hxx
View File

@ -148,6 +148,15 @@ public:
/* virtual methods from class OutputStream */ /* virtual methods from class OutputStream */
void Write(const void *data, size_t size) override; void Write(const void *data, size_t size) override;
/**
* Flush all data written to this object to disk (but does not
* commit to the final path). This method blocks until this
* flush is complete. It can be called repeatedly.
*
* Throws on error.
*/
void Sync();
/** /**
* Commit all data written to the file and make the file * Commit all data written to the file and make the file
* visible on the specified path. * visible on the specified path.