57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
// Copyright 2021 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <err.h>
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#include <errno.h>
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#include <sys/epoll.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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// Tests that FIONREAD is supported with host FD.
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void testFionread() {
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int size = 0;
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if (ioctl(STDOUT_FILENO, FIONREAD, &size) < 0) {
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err(1, "ioctl(stdin, FIONREAD)");
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}
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if (size != 0) {
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err(1, "FIONREAD wrong size, want: 0, got: %d", size);
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}
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}
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// Docker maps stdin to /dev/null which doesn't support epoll. Check that error
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// is correctly propagated.
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void testEpoll() {
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int fd = epoll_create(1);
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if (fd < 0) {
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err(1, "epoll_create");
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}
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struct epoll_event event;
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event.events = EPOLLIN;
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event.data.u64 = 123;
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int res = epoll_ctl(fd, EPOLL_CTL_ADD, 0, &event);
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if (res != -1) {
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err(1, "epoll_ctl(EPOLL_CTL_ADD, stdin) should have failed");
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}
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if (errno != EPERM) {
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err(1, "epoll_ctl(EPOLL_CTL_ADD, stdin) should have returned EPERM");
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}
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}
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int main(int argc, char** argv) {
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testFionread();
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testEpoll();
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return 0;
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}
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