From 4b04589b097896795648de38b1e9bbc7570d9696 Mon Sep 17 00:00:00 2001 From: Joel Sherrill Date: Mon, 1 Aug 2022 17:12:21 -0500 Subject: Add support for CONFIGURE_POSIX_TIMERS_FACE_BEHAVIOR This adds the configure option CONFIGURE_POSIX_TIMERS_FACE_BEHAVIOR which allows the application to choose whether to have the POSIX timer_create() function follow the behavior defined by POSIX or the FACE Technical Standard. Updates #4691. --- cpukit/posix/src/psxtimercreate.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) (limited to 'cpukit/posix/src/psxtimercreate.c') diff --git a/cpukit/posix/src/psxtimercreate.c b/cpukit/posix/src/psxtimercreate.c index 0eefac3f42..907da01836 100644 --- a/cpukit/posix/src/psxtimercreate.c +++ b/cpukit/posix/src/psxtimercreate.c @@ -51,6 +51,31 @@ #include #include +RTEMS_WEAK int _POSIX_Timer_Is_allowed( + clockid_t clock_id +) +{ + int rc = 0; + + /* + * Allow timer_create(CLOCK_REALTIME. ...) per POSIX by default + * on CLOCK_REALTIME or CLOCK_MONOTONIC. + * + * But per the FACE Technical Standard, POSIX timers should not be + * allowed on CLOCK_REALTIME for safety reasons. If the application + * configures that it wants the FACE behavior, then this method + * is overridden by . + */ + + if ( clock_id != CLOCK_REALTIME ) { + if ( clock_id != CLOCK_MONOTONIC ) { + rc = EINVAL; + } + } + + return rc; +} + int timer_create( clockid_t clock_id, struct sigevent *__restrict evp, @@ -58,9 +83,11 @@ int timer_create( ) { POSIX_Timer_Control *ptimer; + int rc; - if ( clock_id != CLOCK_REALTIME && clock_id != CLOCK_MONOTONIC ) - rtems_set_errno_and_return_minus_one( EINVAL ); + rc = _POSIX_Timer_Is_allowed( clock_id ); + if ( rc != 0 ) + rtems_set_errno_and_return_minus_one( rc ); if ( !timerid ) rtems_set_errno_and_return_minus_one( EINVAL ); -- cgit v1.2.3