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//===-- Interactive unittests for select ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/sys/select/select.h"
#include "src/unistd/read.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
#include <sys/select.h>
#include <unistd.h>
using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
using LlvmLibcSelectTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
// This test is not be run automatically as part of the libc testsuite.
// Instead, one has to run it manually and press a key on the keyboard
// to make the test succeed.
TEST_F(LlvmLibcSelectTest, ReadStdinAfterSelect) {
constexpr int STDIN_FD = 0;
fd_set set;
FD_ZERO(&set);
FD_SET(STDIN_FD, &set);
struct timeval zero {
0, 0
}; // No wait
struct timeval hr {
3600, 0
}; // Wait for an hour.
// Zero timeout means we don't wait for input. So, select should return
// immediately.
ASSERT_THAT(
LIBC_NAMESPACE::select(STDIN_FD + 1, &set, nullptr, nullptr, &zero),
Succeeds(0));
// The set should indicate that stdin is NOT ready for reading.
ASSERT_EQ(0, FD_ISSET(STDIN_FD, &set));
FD_SET(STDIN_FD, &set);
// Wait for an hour and give the user a chance to hit a key.
ASSERT_THAT(LIBC_NAMESPACE::select(STDIN_FD + 1, &set, nullptr, nullptr, &hr),
Succeeds(1));
// The set should indicate that stdin is ready for reading.
ASSERT_EQ(1, FD_ISSET(STDIN_FD, &set));
// Verify that atleast one character can be read.
char c;
ASSERT_THAT(LIBC_NAMESPACE::read(STDIN_FD, &c, 1), Succeeds(ssize_t(1)));
}
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