This page helps rank how FreeBSD currently functions with certain opensource/UNIX standards, such as ISO C, POSIX, XSI, etc.
IEEE 1003.1-2001
sys/time.h // time.h
| CLOCK_UPTIME .. CLOCK_SECOND | FreeBSD specific clocks/timers aren't properly hidden under __BSD_VISIBLE. |
| _POSIX_CPUTIME, et all | Not implemented, despite the fact that _POSIX_THREAD_CPUTIME is implemented. Gross oversight? |
| Incorrect includes | Some headers are including time.h and others are including sys/time.h by accident which has resulted in improper breakage in the sourcebase, based on the requirements in the stated in the FreeBSD and OpenGroup manpages. |
errno.h
| ENODATA | not implemented (XSI) |
| ENOSR | not implemented (XSI) |
| ENOSTR | not implemented (XSI) |
| ETIME | not implemented (XSI) |
sched.h
| SCHED_SPORADIC | not implemented |
| struct sched_param | not implemented |
stdlib.h
| realpath | non-conformant pieces ; see [3] |
unistd.h
| _SC_TIMERS / _SC_TIMER_MAX | value doesn't take into account offset of 3 used in sys/kern/kern_time.c used for `[timers] reserved for setitimer()'. |
POSIX 2008.1
sys/kern/kern_time.c
| clockid_t | Many of the timer values are implemented as int, instead of clockid_t; being pedantic they should be defined as clockid_t (int32_t). |
| clock_getcpuclockid | not implemented |
| clock_nanosleep | not implemented; requires some kernel interfaces currently missing [2]. |
| clock_settime | kern_clock_settime does not return EINVAL for CLOCK_MONOTONIC. |
| itimerfix // itimespecfix | Is overloaded and unfortunately broken as it doesn't handle negative usec / nsec times. |
| timer_create | always returns EINVAL for CLOCK_THREAD_CPUTIME_ID due to definitions of MAX_CLOCKS; thus creating a timer for CLOCK_THREAD_CPUTIME_ID is completely impossible. |
limits.h
| PTHREAD_KEYS_MAX | Should be defined in limits.h, not pthread.h |
| PTHREAD_STACK_MIN | Should be defined in limits.h, not pthread.h |
mqueue.h
| mqd_t | Defined as a structure in FreeBSD. Is an integer in Linux. This means that code which assumes that mq_* APIs will return EBADF when provided a bad file descriptor (say -1) instead of segfaulting will get a nasty surprise. POSIX doesn't state what the underlying type has to be. |
XSI
signal.h
| SIGPOLL | not implemented |
| struct sig_param | not implemented |
time.h
| daylight | broken (both in FreeBSD and in POSIX); won't fix |
| getdate(3) | not implemented |
| timezone | broken (both in FreeBSD and in POSIX); won't fix |
| tzname | broken (both in FreeBSD and in POSIX); won't fix |
Under debate
The state of the following items is under debate:
signal.h
| SIGPOLL | XSI – unsupported by choice for functional and security reasons |
References
Related Pages