2021-10-05 15:50:33 +03:00
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// vtest retry: 3
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2021-06-15 04:44:31 +03:00
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import os
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import os.notify
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// make a pipe and return the (read, write) file descriptors
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fn make_pipe() ?(int, int) {
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$if linux {
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pipefd := [2]int{}
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if C.pipe(&pipefd[0]) != 0 {
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return error('error $C.errno: ' + os.posix_get_error_msg(C.errno))
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}
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return pipefd[0], pipefd[1]
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}
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return -1, -1
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}
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fn test_level_trigger() ? {
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// currently only linux is supported
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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os.fd_close(writer)
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notifier.close() or {}
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}
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notifier.add(reader, .read) ?
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os.fd_write(writer, 'foobar')
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check_read_event(notifier, reader, 'foo')
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check_read_event(notifier, reader, 'bar')
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assert notifier.wait(0).len == 0
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}
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}
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fn test_edge_trigger() ? {
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// currently only linux is supported
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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os.fd_close(writer)
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notifier.close() or {}
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}
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notifier.add(reader, .read, .edge_trigger) ?
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os.fd_write(writer, 'foobar')
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check_read_event(notifier, reader, 'foo')
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assert notifier.wait(0).len == 0
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os.fd_write(writer, 'baz')
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// we do not get an event because there is still data
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// to be read
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assert notifier.wait(0).len == 0
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}
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}
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fn test_one_shot() ? {
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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os.fd_close(writer)
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notifier.close() or {}
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}
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notifier.add(reader, .read, .one_shot) ?
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os.fd_write(writer, 'foobar')
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check_read_event(notifier, reader, 'foo')
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os.fd_write(writer, 'baz')
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assert notifier.wait(0).len == 0
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// rearm
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notifier.modify(reader, .read) ?
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check_read_event(notifier, reader, 'barbaz')
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}
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}
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fn test_hangup() ? {
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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notifier.close() or {}
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}
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notifier.add(reader, .hangup) ?
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assert notifier.wait(0).len == 0
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// closing on the writer end of the pipe will
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// cause a hangup on the reader end
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os.fd_close(writer)
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events := notifier.wait(0)
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assert events.len == 1
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assert events[0].fd == reader
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assert events[0].kind.has(.hangup)
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}
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}
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fn test_write() ? {
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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os.fd_close(writer)
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notifier.close() or {}
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}
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notifier.add(reader, .write) ?
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assert notifier.wait(0).len == 0
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notifier.add(writer, .write) ?
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events := notifier.wait(0)
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assert events.len == 1
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assert events[0].fd == writer
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assert events[0].kind.has(.write)
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}
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}
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fn test_remove() ? {
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$if linux {
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mut notifier := notify.new() ?
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reader, writer := make_pipe() ?
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defer {
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os.fd_close(reader)
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os.fd_close(writer)
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notifier.close() or {}
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}
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// level triggered - will keep getting events while
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// there is data to read
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notifier.add(reader, .read) ?
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os.fd_write(writer, 'foobar')
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assert notifier.wait(0).len == 1
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assert notifier.wait(0).len == 1
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notifier.remove(reader) ?
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assert notifier.wait(0).len == 0
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}
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}
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fn check_read_event(notifier notify.FdNotifier, reader_fd int, expected string) {
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events := notifier.wait(0)
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assert events.len == 1
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assert events[0].fd == reader_fd
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assert events[0].kind.has(.read)
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s, _ := os.fd_read(events[0].fd, expected.len)
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assert s == expected
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}
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