Solaris supports termios constants like FIONREAD with an appropiate "#include" in the C code. The main issue is that some names conflicts between System V and BSD personalities.I could evaluate the situation and do a patch proposal for Python 3.7. We are still a week away of 3.7RC1 and this patch would affect only Solaris/derivatives.

Solaris has two personalities: System V and BSD. This is not usually an issue but sometimes some constants have a different value in a mode or the other.By default, when including <sys/ioctl.h> Solaris is in System V mode. We can force BSD mode defining symbol "BSD_COMP". This greatly expand the names available but, unfortunately, some values change.The comment in <sys/ioctl.h> is quite clear:""" *      There are some inherent problems in having a single file *      ioctl.h, with both System V and BSD flags. Introducing *      BSD flags into this file creates compilation problems *      with flags such as ECHO, NL1 etc., if termio.h and ioctl.h *      are included by the same file. Since these two files can *      be only included by System V applications, /usr/inclule/sys/ioctl.h *      will be System V mode and all the BSD flags will be turned off *      using #ifdef BSD_COMP. This file will also exist in *      /usr/ucbinclude/sys/ioctl.h for BSD applications but without the *      BSD flags turned off. System V appliactions can use ioctl.h without *      any changes, System V applications requiring BSD flags should *      -D BSD_COMP when compiling (and be warned about the common *      flags between System V and BSD) and BSD applications should *      use /usr/ucbinclude/sys/ioctl.h."""Using "gcc -dM -E" we can observe defined symbols.Ambiguous values when defininf "BSD_COMP" are: BS0, BS1, CR0, CR1, CR2, CR3, ECHO, FF0, FF1, FLUSHO, NL0, NL1, NOFLSH, PENDIN, TAB0, TAB1, TAB2, TOSTOP, XTABS.Sounds quite important, actually.Since I am no aiming to perfection, I would be satisfied making quite a few new symbols available, not all of them. A simple approach would be to include <sys/filio.h> and <sys/sockio.h>. In those header files there are only constants, not functions or data structures.Just including those headers we get these new symbols (none overlapping other):_FIO_COMPRESSED_FIO_COUNT_FILLED_FIO_GET_TOP_STATS_FIO_SEEK_DATA_FIO_SEEK_HOLE_FIO_SET_LUFS_DEBUG_FIO_SET_LUFS_ERROR_FIOAI_FIODIRECTIO_FIOFFS_FIOGDIO_FIOGETMAXPHYS_FIOGETSUPERBLOCK_FIOIO_FIOISBUSY_FIOISLOG_FIOISLOGOK_FIOLFS_FIOLFSS_FIOLOGDISABLE_FIOLOGENABLE_FIOLOGRESET_FIOOBSOLETE67_FIOSATIME_FIOSDIO_FIOSNAPSHOTCREATE_FIOSNAPSHOTCREATE_MULTI_FIOSNAPSHOTDELETE_FIOTUNE_IO(x,y)_IOR(x,y,t)_IORN(x,y,t)_IOW(x,y,t)_IOWN(x,y,t)_IOWR(x,y,t)_IOWRN(x,y,t)_SIOCSOCKFALLBACK_SYS_FILIO_H_SYS_IOCCOM_H_SYS_SOCKIO_HFIOASYNCFIOCLEXFIOGETOWNFIONBIOFIONCLEXFIONREADFIOSETOWNIF_UNITSELIOC_INIOC_INOUTIOC_OUTIOC_VOIDIOCPARM_MASKO_SIOCGIFCONFO_SIOCGLIFCONFSIOCADDMULTISIOCADDRTSIOCATMARKSIOCDARPSIOCDELMULTISIOCDELRTSIOCDXARPSIOCGARPSIOCGDSTINFOSIOCGENADDRSIOCGENPSTATSSIOCGETLSGCNTSIOCGETNAMESIOCGETPEERSIOCGETPROPSIOCGETSGCNTSIOCGETSYNCSIOCGETVIFCNTSIOCGHIWATSIOCGIFADDRSIOCGIFBRDADDRSIOCGIFCONFSIOCGIFDSTADDRSIOCGIFFLAGSSIOCGIFHWADDRSIOCGIFINDEXSIOCGIFMEMSIOCGIFMETRICSIOCGIFMTUSIOCGIFMUXIDSIOCGIFNETMASKSIOCGIFNUMSIOCGIP6ADDRPOLICYSIOCGIPMSFILTERSIOCGLIFADDRSIOCGLIFBINDINGSIOCGLIFBRDADDRSIOCGLIFCONFSIOCGLIFDADSTATESIOCGLIFDSTADDRSIOCGLIFFLAGSSIOCGLIFGROUPINFOSIOCGLIFGROUPNAMESIOCGLIFHWADDRSIOCGLIFINDEXSIOCGLIFLNKINFOSIOCGLIFMETRICSIOCGLIFMTUSIOCGLIFMUXIDSIOCGLIFNETMASKSIOCGLIFNUMSIOCGLIFSRCOFSIOCGLIFSUBNETSIOCGLIFTOKENSIOCGLIFUSESRCSIOCGLIFZONESIOCGLOWATSIOCGMSFILTERSIOCGPGRPSIOCGSTAMPSIOCGXARPSIOCIFDETACHSIOCILBSIOCLIFADDIFSIOCLIFDELNDSIOCLIFGETNDSIOCLIFREMOVEIFSIOCLIFSETNDSIOCLOWERSIOCSARPSIOCSCTPGOPTSIOCSCTPPEELOFFSIOCSCTPSOPTSIOCSENABLESDPSIOCSETPROPSIOCSETSYNCSIOCSHIWATSIOCSIFADDRSIOCSIFBRDADDRSIOCSIFDSTADDRSIOCSIFFLAGSSIOCSIFINDEXSIOCSIFMEMSIOCSIFMETRICSIOCSIFMTUSIOCSIFMUXIDSIOCSIFNAMESIOCSIFNETMASKSIOCSIP6ADDRPOLICYSIOCSIPMSFILTERSIOCSLGETREQSIOCSLIFADDRSIOCSLIFBRDADDRSIOCSLIFDSTADDRSIOCSLIFFLAGSSIOCSLIFGROUPNAMESIOCSLIFINDEXSIOCSLIFLNKINFOSIOCSLIFMETRICSIOCSLIFMTUSIOCSLIFMUXIDSIOCSLIFNAMESIOCSLIFNETMASKSIOCSLIFPREFIXSIOCSLIFSUBNETSIOCSLIFTOKENSIOCSLIFUSESRCSIOCSLIFZONESIOCSLOWATSIOCSLSTATSIOCSMSFILTERSIOCSPGRPSIOCSPROMISCSIOCSQPTRSIOCSSDSTATSSIOCSSESTATSSIOCSXARPSIOCTMYADDRSIOCTMYSITESIOCTONLINKSIOCUPPERSIOCX25RCVSIOCX25TBLSIOCX25XMTSIOCXPROTONot all those symbols are going to be exported in Python.

After doing this change, I see FIVE new symbols in Python's termios:"""FIONREAD, FIONCLEX, FIOCLEX, FIOASYNC, FIONBIO."""Good enough for now and me.

With this change, a SmarOS native zone exports 206 symbols in Python termios. Before it export 201. By comparison, a Linux Ubuntu 16.04 Python provides 244 symbols.Some references for the future:http://www.verycomputer.com/168_45f4bd8c333a252f_1.htm

New changesetf0a95f27c043e847a23940534fdfc53e1b3e31a1 by jcea in branch 'master':bpo-32660: Solaris should support constants like termios' FIONREAD (#5328)https://github.com/python/cpython/commit/f0a95f27c043e847a23940534fdfc53e1b3e31a1