Author: wulf Date: Sun Nov 24 20:51:09 2019 New Revision: 355068 URL: https://svnweb.freebsd.org/changeset/base/355068
Log: Linux epoll: Allow passing of any negative timeout value to epoll_wait Linux epoll allow passing of any negative timeout value to epoll_wait() to cause unbound blocking Reviewed by: emaste MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D22517 Modified: head/sys/compat/linux/linux_event.c Modified: head/sys/compat/linux/linux_event.c ============================================================================== --- head/sys/compat/linux/linux_event.c Sun Nov 24 20:47:40 2019 (r355067) +++ head/sys/compat/linux/linux_event.c Sun Nov 24 20:51:09 2019 (r355068) @@ -557,13 +557,13 @@ linux_epoll_wait_common(struct thread *td, int epfd, s return (error); if (epfp->f_type != DTYPE_KQUEUE) { error = EINVAL; - goto leave1; + goto leave; } if (uset != NULL) { error = kern_sigprocmask(td, SIG_SETMASK, uset, &omask, 0); if (error != 0) - goto leave1; + goto leave; td->td_pflags |= TDP_OLDMASK; /* * Make sure that ast() is called on return to @@ -581,11 +581,12 @@ linux_epoll_wait_common(struct thread *td, int epfd, s coargs.count = 0; coargs.error = 0; - if (timeout != -1) { - if (timeout < 0) { - error = EINVAL; - goto leave0; - } + /* + * Linux epoll_wait(2) man page states that timeout of -1 causes caller + * to block indefinitely. Real implementation does it if any negative + * timeout value is passed. + */ + if (timeout >= 0) { /* Convert from milliseconds to timespec. */ ts.tv_sec = timeout / 1000; ts.tv_nsec = (timeout % 1000) * 1000000; @@ -605,11 +606,10 @@ linux_epoll_wait_common(struct thread *td, int epfd, s if (error == 0) td->td_retval[0] = coargs.count; -leave0: if (uset != NULL) error = kern_sigprocmask(td, SIG_SETMASK, &omask, NULL, 0); -leave1: +leave: fdrop(epfp, td); return (error); } _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
