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Is append to file atomic?
The actual maximum atomic append size varies not only by OS, but by filesystem. @akavel agreed; there’s no guarantee that the write itself is atomic.
Can two processes write to the same file?
no, generally it is not safe to do this! you need to obtain an exclusive write lock for each process — that implies that all the other processes will have to wait while one process is writing to the file.. the more I/O intensive processes you have, the longer the wait time.
Is Python list append thread-safe?
To clarify a point in Thomas’ excellent answer, it should be mentioned that append() is thread safe. This is because there is no concern that data being read will be in the same place once we go to write to it. The append() operation does not read data, it only writes data to the list.
Why does O _ append lead to corrupted files?
O_APPEND may lead to corrupted files on NFS filesystems if more than one process appends data to a file at once. This is because NFS does not support appending to a file, so the client kernel has to simulate it, which can’t be done without a race condition.
When to ignore the mode argument in Linux?
The mode argument specifies the file mode bits to be applied when a new file is created. If neither O_CREAT nor O_TMPFILE is specified in flags, then mode is ignored (and can thus be specified as 0, or simply omitted).
What does open file description mean in POSIX?
Open file descriptions The term open file description is the one used by POSIX to refer to the entries in the system-wide table of open files. In other contexts, this object is variously also called an “open file object”, a “file handle”, an “open file table entry”, or—in kernel-developer parlance—a struct file .
What are the arguments for open ( 2 ) Linux?
The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. These request opening the file read-only, write-only, or read/write, respectively.