From 56eee8e870a286ab82a3707cb873e08735d0e510 Mon Sep 17 00:00:00 2001 From: tiif Date: Sat, 17 Aug 2024 00:18:18 +0800 Subject: [PATCH] Apply test fix - Fix epoll_ctl_del test - Simplified epoll_ctl_mod test and add test_no_notification_for_unregister_flag - Use assert_eq(0) for epoll_ctl --- .../miri/tests/pass-dep/libc/libc-epoll.rs | 103 +++++++++++------- 1 file changed, 65 insertions(+), 38 deletions(-) diff --git a/src/tools/miri/tests/pass-dep/libc/libc-epoll.rs b/src/tools/miri/tests/pass-dep/libc/libc-epoll.rs index 8326353451fa5..71f0e832afb11 100644 --- a/src/tools/miri/tests/pass-dep/libc/libc-epoll.rs +++ b/src/tools/miri/tests/pass-dep/libc/libc-epoll.rs @@ -14,6 +14,7 @@ fn main() { test_not_fully_closed_fd(); test_closed_fd(); test_two_epoll_instance(); + test_no_notification_for_unregister_flag(); test_epoll_ctl_mod(); test_epoll_ctl_del(); test_pointer(); @@ -68,7 +69,7 @@ fn test_epoll_socketpair() { u64: u64::try_from(fds[1]).unwrap(), }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Check result from epoll_wait. let expected_event = u32::try_from(libc::EPOLLIN | libc::EPOLLOUT).unwrap(); @@ -99,6 +100,8 @@ fn test_epoll_socketpair() { check_epoll_wait::<8>(epfd, &[(expected_event, expected_value)]); } +// This test first registers a file description with a flag that does not lead to notification, +// then EPOLL_CTL_MOD to add another flag that will lead to notification. fn test_epoll_ctl_mod() { // Create an epoll instance. let epfd = unsafe { libc::epoll_create1(0) }; @@ -109,37 +112,27 @@ fn test_epoll_ctl_mod() { let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) }; assert_eq!(res, 0); - // Write to fd[0]. - let data = "abcde".as_bytes().as_ptr(); - let res = unsafe { libc::write(fds[0], data as *const libc::c_void, 5) }; - assert_eq!(res, 5); - - // Register fd[1] with EPOLLIN|EPOLLOUT|EPOLLET. - // (Not using checked cast as EPOLLET wraps around.) - let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fds[1]).unwrap() }; + // Register fd[1] with EPOLLIN|EPOLLET. + let mut ev = libc::epoll_event { + events: (libc::EPOLLIN | libc::EPOLLET) as _, + u64: u64::try_from(fds[1]).unwrap(), + }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); - // Check result from epoll_wait. - let expected_event = u32::try_from(libc::EPOLLIN | libc::EPOLLOUT).unwrap(); - let expected_value = u64::try_from(fds[1]).unwrap(); - check_epoll_wait::<8>(epfd, &[(expected_event, expected_value)]); + // Check result from epoll_wait. No notification would be returned. + check_epoll_wait::<8>(epfd, &[]); - // Test EPOLLRDHUP. + // Use EPOLL_CTL_MOD to change to EPOLLOUT flag. let mut ev = libc::epoll_event { - events: (libc::EPOLLIN | libc::EPOLLOUT | libc::EPOLLET | libc::EPOLLRDHUP) as _, + events: (libc::EPOLLOUT | libc::EPOLLET) as _, u64: u64::try_from(fds[1]).unwrap(), }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_MOD, fds[1], &mut ev) }; - assert_ne!(res, -1); - - // Close the other side of the socketpair to invoke EPOLLRDHUP. - let res = unsafe { libc::close(fds[0]) }; assert_eq!(res, 0); - // Check result from epoll_wait. - let expected_event = - u32::try_from(libc::EPOLLRDHUP | libc::EPOLLIN | libc::EPOLLOUT | libc::EPOLLHUP).unwrap(); + // Check result from epoll_wait. EPOLLOUT notification is expected. + let expected_event = u32::try_from(libc::EPOLLOUT).unwrap(); let expected_value = u64::try_from(fds[1]).unwrap(); check_epoll_wait::<8>(epfd, &[(expected_event, expected_value)]); } @@ -162,10 +155,12 @@ fn test_epoll_ctl_del() { // Register fd[1] with EPOLLIN|EPOLLOUT|EPOLLET let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fds[1]).unwrap() }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Test EPOLL_CTL_DEL. - check_epoll_wait::<0>(epfd, &[]); + let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_DEL, fds[1], &mut ev) }; + assert_eq!(res, 0); + check_epoll_wait::<8>(epfd, &[]); } // This test is for one fd registered under two different epoll instance. @@ -189,9 +184,9 @@ fn test_two_epoll_instance() { // Register one side of the socketpair with EPOLLIN | EPOLLOUT | EPOLLET. let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fds[1]).unwrap() }; let res = unsafe { libc::epoll_ctl(epfd1, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); let res = unsafe { libc::epoll_ctl(epfd2, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Notification should be received from both instance of epoll. let expected_event = u32::try_from(libc::EPOLLIN | libc::EPOLLOUT).unwrap(); @@ -219,9 +214,9 @@ fn test_two_same_fd_in_same_epoll_instance() { // Register both fd to the same epoll instance. let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: 5 as u64 }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, newfd, &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Write to the socketpair. let data = "abcde".as_bytes().as_ptr(); @@ -254,7 +249,7 @@ fn test_epoll_eventfd() { // Register eventfd with EPOLLIN | EPOLLOUT | EPOLLET let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fd).unwrap() }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fd, &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Check result from epoll_wait. let expected_event = u32::try_from(libc::EPOLLIN | libc::EPOLLOUT).unwrap(); @@ -277,7 +272,7 @@ fn test_pointer() { let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: data.expose_provenance() as u64 }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); } // When read/write happened on one side of the socketpair, only the other side will be notified. @@ -294,10 +289,10 @@ fn test_epoll_socketpair_both_sides() { // Register both fd to the same epoll instance. let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: fds[0] as u64 }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[0], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: fds[1] as u64 }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Write to fds[1]. let data = "abcde".as_bytes().as_ptr(); @@ -340,7 +335,7 @@ fn test_closed_fd() { // Register eventfd with EPOLLIN | EPOLLOUT | EPOLLET let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fd).unwrap() }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fd, &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Write to the eventfd instance. let sized_8_data: [u8; 8] = 1_u64.to_ne_bytes(); @@ -377,7 +372,7 @@ fn test_not_fully_closed_fd() { // Register eventfd with EPOLLIN | EPOLLOUT | EPOLLET let mut ev = libc::epoll_event { events: EPOLL_IN_OUT_ET, u64: u64::try_from(fd).unwrap() }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fd, &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Close the original fd that being used to register with epoll. let res = unsafe { libc::close(fd) }; @@ -423,7 +418,7 @@ fn test_event_overwrite() { u64: u64::try_from(fd).unwrap(), }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fd, &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Read from the eventfd instance. let mut buf: [u8; 8] = [0; 8]; @@ -454,13 +449,13 @@ fn test_socketpair_read() { u64: fds[0] as u64, }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[0], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); let mut ev = libc::epoll_event { events: (libc::EPOLLIN | libc::EPOLLOUT | libc::EPOLLET) as _, u64: fds[1] as u64, }; let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; - assert_ne!(res, -1); + assert_eq!(res, 0); // Write 5 bytes to fds[1]. let data = "abcde".as_bytes().as_ptr(); @@ -501,3 +496,35 @@ fn test_socketpair_read() { let expected_value = fds[1] as u64; check_epoll_wait::<8>(epfd, &[(expected_event, expected_value)]); } + +// This is to test whether flag that we don't register won't trigger notification. +fn test_no_notification_for_unregister_flag() { + // Create an epoll instance. + let epfd = unsafe { libc::epoll_create1(0) }; + assert_ne!(epfd, -1); + + // Create a socketpair instance. + let mut fds = [-1, -1]; + let res = unsafe { libc::socketpair(libc::AF_UNIX, libc::SOCK_STREAM, 0, fds.as_mut_ptr()) }; + assert_eq!(res, 0); + + // Register fd[0] with EPOLLOUT|EPOLLET. + let mut ev = libc::epoll_event { + events: (libc::EPOLLOUT | libc::EPOLLET) as _, + u64: u64::try_from(fds[0]).unwrap(), + }; + let res = unsafe { libc::epoll_ctl(epfd, libc::EPOLL_CTL_ADD, fds[1], &mut ev) }; + assert_eq!(res, 0); + + // Write to fd[1]. + let data = "abcde".as_bytes().as_ptr(); + let res: i32 = + unsafe { libc::write(fds[1], data as *const libc::c_void, 5).try_into().unwrap() }; + assert_eq!(res, 5); + + // Check result from epoll_wait. Since we didn't register EPOLLIN flag, the notification won't + // contain EPOLLIN even though fds[0] is now readable. + let expected_event = u32::try_from(libc::EPOLLOUT).unwrap(); + let expected_value = u64::try_from(fds[0]).unwrap(); + check_epoll_wait::<8>(epfd, &[(expected_event, expected_value)]); +}