CODEWITHSUNDEEP
linux
pjay
pjay

Reputation: 2482

Crash after write in linux

What would happen if I were to use write() to write some data to a file on disk. But my application were to crash before flushing. Is it guaranteed that my data will get eventually flushed to disk if there is no system failure?

Upvotes: 6

Views: 1550

Answers (1)

James Kanze
James Kanze

Reputation: 154017

If you're using write (and not fwrite or std::ostream::write), then there is no in process buffering. If there is no system failure, then the data will, sooner or later (and generally fairly soon) be written to disk.

If you're really concerned by data integrity, you can or in the flags O_DSYNC and O_SYNC to the flags when you open the file. If you do this, you are guaranteed that the data is physically written to the disk before the return from write.

Upvotes: 5

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