Re: [Libguestfs] [libnbd PATCH v3 06/29] lib/utils: introduce xwrite() as a more robust write()

While nbd_internal_fork_safe_perror() must indeed call write(), and arguably justifiedly ignores the return value of write(), we can still make the write operations slightly more robust. Let's do that by introducing xwrite(): - don't call write() with nbyte > SSIZE_MAX, for avoiding implementation-defined behavior, - handle partial writes, - cope with EINTR and EAGAIN errors. (A busy loop around EAGAIN on a non-blocking file is not great in the general case, but it's good enough for writing out diagnostics before giving up.) Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; --- lib/utils.c | 39 ++++++++++++++++++-- 1 file changed, 35 insertions(+), 4 deletions(-)