selftests: introduce additional eventfd test coverage
Add several new test cases which assert corner cases on the eventfd mechanism, for example, the supplied buffer is less than 8 bytes, attempting to write a value that is too large, etc. ./eventfd_test # Starting 9 tests from 1 test cases. # RUN global.eventfd_check_flag_rdwr ... # OK global.eventfd_check_flag_rdwr ok 1 global.eventfd_check_flag_rdwr # RUN global.eventfd_check_flag_cloexec ... # OK global.eventfd_check_flag_cloexec ok 2 global.eventfd_check_flag_cloexec # RUN global.eventfd_check_flag_nonblock ... # OK global.eventfd_check_flag_nonblock ok 3 global.eventfd_check_flag_nonblock # RUN global.eventfd_chek_flag_cloexec_and_nonblock ... # OK global.eventfd_chek_flag_cloexec_and_nonblock ok 4 global.eventfd_chek_flag_cloexec_and_nonblock # RUN global.eventfd_check_flag_semaphore ... # OK global.eventfd_check_flag_semaphore ok 5 global.eventfd_check_flag_semaphore # RUN global.eventfd_check_write ... # OK global.eventfd_check_write ok 6 global.eventfd_check_write # RUN global.eventfd_check_read ... # OK global.eventfd_check_read ok 7 global.eventfd_check_read # RUN global.eventfd_check_read_with_nonsemaphore ... # OK global.eventfd_check_read_with_nonsemaphore ok 8 global.eventfd_check_read_with_nonsemaphore # RUN global.eventfd_check_read_with_semaphore ... # OK global.eventfd_check_read_with_semaphore ok 9 global.eventfd_check_read_with_semaphore # PASSED: 9 / 9 tests passed. # Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0 Link: https://lkml.kernel.org/r/20240527000200.5615-1-wen.yang@linux.dev Signed-off-by: Wen Yang <wen.yang@linux.dev> Cc: Shuah Khan <shuah@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Cc: Andrei Vagin <avagin@google.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Dave Young <dyoung@redhat.com> Cc: Tim Bird <tim.bird@sony.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wen Yang
Andrew Morton
parent
51d821654b
commit
87beb66918
@ -13,6 +13,8 @@
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#include <sys/eventfd.h>
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#include "../../kselftest_harness.h"
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#define EVENTFD_TEST_ITERATIONS 100000UL
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struct error {
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int code;
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char msg[512];
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@ -40,7 +42,7 @@ static inline int sys_eventfd2(unsigned int count, int flags)
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return syscall(__NR_eventfd2, count, flags);
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}
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TEST(eventfd01)
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TEST(eventfd_check_flag_rdwr)
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{
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int fd, flags;
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@ -54,7 +56,7 @@ TEST(eventfd01)
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close(fd);
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}
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TEST(eventfd02)
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TEST(eventfd_check_flag_cloexec)
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{
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int fd, flags;
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@ -68,7 +70,7 @@ TEST(eventfd02)
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close(fd);
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}
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TEST(eventfd03)
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TEST(eventfd_check_flag_nonblock)
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{
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int fd, flags;
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@ -83,7 +85,7 @@ TEST(eventfd03)
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close(fd);
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}
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TEST(eventfd04)
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TEST(eventfd_chek_flag_cloexec_and_nonblock)
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{
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int fd, flags;
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@ -161,7 +163,7 @@ static int verify_fdinfo(int fd, struct error *err, const char *prefix,
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return 0;
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}
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TEST(eventfd05)
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TEST(eventfd_check_flag_semaphore)
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{
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struct error err = {0};
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int fd, ret;
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@ -183,4 +185,128 @@ TEST(eventfd05)
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close(fd);
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}
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/*
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* A write(2) fails with the error EINVAL if the size of the supplied buffer
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* is less than 8 bytes, or if an attempt is made to write the value
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* 0xffffffffffffffff.
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*/
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TEST(eventfd_check_write)
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{
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uint64_t value = 1;
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ssize_t size;
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int fd;
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fd = sys_eventfd2(0, 0);
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ASSERT_GE(fd, 0);
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size = write(fd, &value, sizeof(int));
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EXPECT_EQ(size, -1);
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EXPECT_EQ(errno, EINVAL);
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size = write(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(value));
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value = (uint64_t)-1;
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size = write(fd, &value, sizeof(value));
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EXPECT_EQ(size, -1);
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EXPECT_EQ(errno, EINVAL);
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close(fd);
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}
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/*
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* A read(2) fails with the error EINVAL if the size of the supplied buffer is
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* less than 8 bytes.
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*/
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TEST(eventfd_check_read)
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{
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uint64_t value;
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ssize_t size;
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int fd;
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fd = sys_eventfd2(1, 0);
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ASSERT_GE(fd, 0);
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size = read(fd, &value, sizeof(int));
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EXPECT_EQ(size, -1);
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EXPECT_EQ(errno, EINVAL);
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size = read(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(value));
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EXPECT_EQ(value, 1);
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close(fd);
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}
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/*
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* If EFD_SEMAPHORE was not specified and the eventfd counter has a nonzero
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* value, then a read(2) returns 8 bytes containing that value, and the
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* counter's value is reset to zero.
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* If the eventfd counter is zero at the time of the call to read(2), then the
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* call fails with the error EAGAIN if the file descriptor has been made nonblocking.
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*/
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TEST(eventfd_check_read_with_nonsemaphore)
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{
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uint64_t value;
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ssize_t size;
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int fd;
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int i;
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fd = sys_eventfd2(0, EFD_NONBLOCK);
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ASSERT_GE(fd, 0);
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value = 1;
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for (i = 0; i < EVENTFD_TEST_ITERATIONS; i++) {
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size = write(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(value));
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}
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size = read(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(uint64_t));
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EXPECT_EQ(value, EVENTFD_TEST_ITERATIONS);
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size = read(fd, &value, sizeof(value));
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EXPECT_EQ(size, -1);
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EXPECT_EQ(errno, EAGAIN);
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close(fd);
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}
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/*
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* If EFD_SEMAPHORE was specified and the eventfd counter has a nonzero value,
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* then a read(2) returns 8 bytes containing the value 1, and the counter's
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* value is decremented by 1.
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* If the eventfd counter is zero at the time of the call to read(2), then the
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* call fails with the error EAGAIN if the file descriptor has been made nonblocking.
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*/
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TEST(eventfd_check_read_with_semaphore)
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{
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uint64_t value;
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ssize_t size;
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int fd;
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int i;
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fd = sys_eventfd2(0, EFD_SEMAPHORE|EFD_NONBLOCK);
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ASSERT_GE(fd, 0);
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value = 1;
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for (i = 0; i < EVENTFD_TEST_ITERATIONS; i++) {
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size = write(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(value));
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}
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for (i = 0; i < EVENTFD_TEST_ITERATIONS; i++) {
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size = read(fd, &value, sizeof(value));
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EXPECT_EQ(size, sizeof(value));
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EXPECT_EQ(value, 1);
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}
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size = read(fd, &value, sizeof(value));
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EXPECT_EQ(size, -1);
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EXPECT_EQ(errno, EAGAIN);
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close(fd);
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}
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TEST_HARNESS_MAIN
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