uClibc attempts to fully (and rigorously) support "The Open Group Base Specifications Issue 6 IEEE Std 1003.1, 2003 Edition" (aka SuSv3). However, as with any standard, they sometimes require things that are either impossible or are Completely Stupid(tm). Therefore, we cannot claim full compliance, and there may be some areas of uClibc that differ from the requirements of this specification. This document attempts to list these differences and, when completed, will contain a full list of all relevant differences between uClibc and the requirements of the SuSv3. *) The uClibc setlocale() function is not threadsafe. SuSv3 states that "The locale state is common to all threads within a process.". But it does not explicitly mention setlocale() as a function that need not be thread-safe. Making setlocale() threadsafe would require an absurd amount of locking (i.e. inside each and every ctype call such as isalpha()). Furthermore, we consider calling setlocale() from N threads concurrently while using string functions to be a terribly dumb thing to do. Therefore, we have decided that setlocale() shall not be threadsafe. If you are multi-threaded, and you wish to change the global locale state, please take care to prevent all other threads from using any locale or ctype functions until the setlocale() call has finished. ---------------------------------------------------------------- heukelum -- heukelum at freemail dot nl writes: Hi everyone, I think uClibc is a great project! And, since I found the file docs/uClibc_vs_SuSv3.txt in the source tarball which mentioned only fmtmsg as a missing function compared to the SUSv3, I got curious about the length of the list denoted by "". So I built the 20040305-snapshot using allyesconfig, extracted the symbols from the (dynamic) libraries, and compared that list to the SUSv3 header files... The largest source of omissions was the mathematical interface (183/355), followed by optional interfaces (134/355). The result: only 38 non-mathematical interfaces are missing compared to the minimal SUSv3! Naming only one function as missing was over-enthousiastic, but the result was better than I anticipated. A compact list of omissions is appended. I hope this was a helpful exercise ;) Greetings, Alexander P.S. uClibc was compiled with thread support, but did not provide the interfaces pthread_cleanup_push and pthread_cleanup_pop. Omissions from obligatory interfaces: ------------------------------------- stdlib.h: _Exit, lcong48, lldiv, posix_openpt; ecvt, fcvt ndbm.h: [all=9] dbm_* utmpx.h: [all=6] *utx* (but functions without "x" do exist!) nl_types.h: [all] catclose, catgets, catopen unistd.h: getwd, ualarm inttypes.h: imaxdiv fmtmsg.h: fmtmsg string.h: strerror_r setjmp.h: setsigjmp monetary.h: strfmon sys/select.h: pselect sys/socket.h: sockatmark sys/wait.h: waitid Unimplemented optional interfaces: ---------------------------------- trace.h: (depends on TRC) [all=50] posix_trace_* pthread.h: (depends on THR) pthread_cleanup_{push,pop}; pthread_attr_{g,s}etstack (depend on TSA TSS); [7] pthread_barrier* (depend on BAR); pthread_condattr_{g,s}et_clock (depend on CS); pthread_getcpuclockid (depends on TCT); pthread_mutex{,attr}_{g,s}etprioceiling (depend on TPP); pthread_mutexattr_{g,s}etprotocol (depend on TPP|TPI); pthread_rwlock_timed{rd,rw}lock (depend on TMO); pthread_setschedprio (depends on TPS); [5] pthread_spin_* (depend on SPI) spawn.h: (depends on SPN) [all=21] posix_spawn* aio.h: (depends on AIO) [all=8] aio_*, lio_* stropts.h: (depends on XSR) isastream, {g,s}et{,p}msg, fattach, fdetach sys/mman.h: posix_madvice (depends on ADV); posix_mem_offset, posix_typed_mem_getinfo, posix_typed_mem_open (depend on TYM); shm_open, shm_unlink (depend on SHM) fcntl.h: posix_fallocate (depend on ADV) signal.h: sigqueue (depends on RTS) Unimplemented mathematical interfaces: -------------------------------------- math.h: [126] many complex.h: [46] all, except cabs fenv.h: [11] all _______________________________________________