New submission from STINNER Victor <vstin...@redhat.com>:
Many Python unit tests require a blocking send into a pipe or a socket. support.PIPE_MAX_SIZE (4 MiB +1 B) has been added for pipes in bpo-17835: sending PIPE_MAX_SIZE into a pipe must block. On Linux, the maximum size of a pipe is /proc/sys/fs/pipe-max-size. Since Linux 2.6.35, it's now possible to get and set the size of a pipe using fcntl with F_GETPIPE_SZ and F_SETPIPE_SZ commands. For sockets, support.SOCK_MAX_SIZE (16 MiB) has been added in bpo-18643. It's possible to get/set the size of receive and send socket buffers using getsockopt() and setsockopt() with SO_RCVBUF and SO_SNDBUF commands. For pipes, I'm not sure that it's possible to get the size of a pipe buffer in a portable way. For example, F_GETPIPE_SZ was only introduced in Linux 2.6.35. Since the first user of these features are tests, maybe we can start with best-effort functions in test.support. Recently, I got issues with buffer sizes in test_multiprocessing_forkserver.test_ignore() (bpo-33532) and sendfile tests of test_asyncio (bpo-33353). ---------- components: Library (Lib) messages: 318411 nosy: pitrou, vstinner, yselivanov priority: normal severity: normal status: open title: Add utilities to get/set pipe and socket buffer sizes? type: enhancement versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue33733> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
