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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/wait.h>
TEST(sys_select, fd_set_smoke) {
fd_set fds;
FD_ZERO(&fds);
for (size_t i = 0; i < 1024; ++i) {
EXPECT_FALSE(FD_ISSET(i, &fds));
}
FD_SET(0, &fds);
EXPECT_TRUE(FD_ISSET(0, &fds));
EXPECT_FALSE(FD_ISSET(1, &fds));
FD_SET(1, &fds);
EXPECT_TRUE(FD_ISSET(0, &fds));
EXPECT_TRUE(FD_ISSET(1, &fds));
FD_CLR(0, &fds);
EXPECT_FALSE(FD_ISSET(0, &fds));
EXPECT_TRUE(FD_ISSET(1, &fds));
FD_CLR(1, &fds);
EXPECT_FALSE(FD_ISSET(0, &fds));
EXPECT_FALSE(FD_ISSET(1, &fds));
}
#define DELAY_MSG "1234"
static void DelayedWrite(int* pid, int* fd) {
int fds[2];
ASSERT_EQ(0, pipe(fds));
if ((*pid = fork()) == 0) {
close(fds[0]);
usleep(5000);
EXPECT_EQ(5, write(fds[1], DELAY_MSG, sizeof(DELAY_MSG)));
close(fds[1]);
exit(0);
}
ASSERT_LT(0, *pid);
close(fds[1]);
*fd = fds[0];
}
static void DelayedWriteCleanup(int pid, int fd) {
char buf[sizeof(DELAY_MSG)];
ASSERT_EQ(static_cast<ssize_t>(sizeof(DELAY_MSG)), read(fd, buf, sizeof(DELAY_MSG)));
ASSERT_STREQ(DELAY_MSG, buf);
ASSERT_EQ(pid, waitpid(pid, NULL, 0));
}
TEST(sys_select, select_smoke) {
fd_set r;
FD_ZERO(&r);
fd_set w;
FD_ZERO(&w);
fd_set e;
FD_ZERO(&e);
FD_SET(STDIN_FILENO, &r);
FD_SET(STDOUT_FILENO, &w);
FD_SET(STDERR_FILENO, &w);
int max = STDERR_FILENO + 1;
// Invalid max fd.
ASSERT_EQ(-1, select(-1, &r, &w, &e, NULL));
ASSERT_EQ(EINVAL, errno);
ASSERT_EQ(2, select(max, &r, &w, &e, NULL));
// Invalid timeout.
timeval tv;
tv.tv_sec = -1;
tv.tv_usec = 0;
ASSERT_EQ(-1, select(max, &r, &w, &e, &tv));
ASSERT_EQ(EINVAL, errno);
// Valid timeout...
tv.tv_sec = 1;
int pid, fd;
DelayedWrite(&pid, &fd);
FD_ZERO(&r);
FD_SET(fd, &r);
ASSERT_EQ(1, select(fd+1, &r, NULL, NULL, &tv));
// Both tv_sec and tv_nsec should have been updated.
ASSERT_EQ(0, tv.tv_sec);
ASSERT_NE(0, tv.tv_usec);
DelayedWriteCleanup(pid, fd);
}
TEST(sys_select, pselect_smoke) {
sigset_t ss;
sigemptyset(&ss);
sigaddset(&ss, SIGPIPE);
fd_set r;
FD_ZERO(&r);
fd_set w;
FD_ZERO(&w);
fd_set e;
FD_ZERO(&e);
FD_SET(STDIN_FILENO, &r);
FD_SET(STDOUT_FILENO, &w);
FD_SET(STDERR_FILENO, &w);
int max = STDERR_FILENO + 1;
// Invalid max fd.
ASSERT_EQ(-1, pselect(-1, &r, &w, &e, NULL, &ss));
ASSERT_EQ(EINVAL, errno);
ASSERT_EQ(2, pselect(max, &r, &w, &e, NULL, &ss));
// Invalid timeout.
timespec tv;
tv.tv_sec = -1;
tv.tv_nsec = 0;
ASSERT_EQ(-1, pselect(max, &r, &w, &e, &tv, &ss));
ASSERT_EQ(EINVAL, errno);
// Valid timeout...
tv.tv_sec = 1;
int pid, fd;
DelayedWrite(&pid, &fd);
FD_ZERO(&r);
FD_SET(fd, &r);
ASSERT_EQ(1, pselect(fd+1, &r, NULL, NULL, &tv, NULL));
// Neither tv_sec nor tv_nsec should have been updated.
ASSERT_EQ(1, tv.tv_sec);
ASSERT_EQ(0, tv.tv_nsec);
DelayedWriteCleanup(pid, fd);
}
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