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65026da59c
Do not report failure on zero sized writes, and handle them as no-op.
There's issues for example in case of writev() when there's iovec
containing zero buffer as a first one. It's expected writev() on below
example to successfully perform the write to specified writable cgroup
file expecting integer value, and to return 2. For now it's returning
value -1, and skipping the write:
int writetest(int fd) {
const char *buf1 = "";
const char *buf2 = "1\n";
struct iovec iov[2] = {
{ .iov_base = (void*)buf1, .iov_len = 0 },
{ .iov_base = (void*)buf2, .iov_len = 2 }
};
return writev(fd, iov, 2);
}
This patch fixes the issue by checking if there's nothing to write,
and handling the write as no-op by just returning 0.
Signed-off-by: Jouni Roivas <jouni.roivas@tuxera.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.