Quoting Tristan Wibberley <tristan.wibber...@gmail.com>:
Why
===
A common idiom on Linux is to open a file and keep the fd open so that
the underlying file can be unlinked from its directory. But if the file
needs to be read from several different parts of the codebase then due to
the file descriptor having exactly one read pointer those different parts
must be synchronised which is a relatively difficult task.
Another alternative is to use pwrite() / pread(), which do not affect the file
pointer. They're in POSIX.
- Kevin
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