Unix98 Pty Support for XEmacs

The following patch against 21.1.7 adds support for Unix98 Ptys (/dev/ptmx) as supported by Linux 2.2 kernels and glibc 2.1. IMO the patch has one problem: It checks directly for __GLIBC__ and only works for __GLIBC__. Replacing getpt with open ("/dev/ptmx",..) and ptsname_r with ptsname would get this working on otherplatforms (getpt and ptsname_r are glibc extensions - but getpt is quite useful since it even works if /dev/ptmx doesn't work;-). I guess, I should rewrite this and use some configure tests. Since opening /dev/ptmx might involve some system specific handling, I would check for now for grantpt, unlockpt and ptsname - and if all exists, define USE_UNIX98_PTYS - and check additionally for getpt - and use USE_UNIX98_PTYS && HAVE_GETPT instead of the check for glibc. What do you think? Andreas --- process-unix.c +++ process-unix.c Wed Dec 1 17:00:02 1999 ＠＠ -204,6 +204,21 ＠＠ static int allocate_pty (void) { + int fd; +#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1) + if ((fd = getpt ()) < 0) + return -1; + + if (grantpt (fd) < 0 || + unlockpt (fd) < 0 || + ptsname_r (fd, pty_name, sizeof pty_name)) + { + close (fd); + return -1; + } + setup_pty (fd); + return fd; +#else /* !glibc */ #ifndef PTY_OPEN struct stat stb; ＠＠ -215,7 +230,6 ＠＠ int failed_count = 0; #endif int i; - int fd; int c; #ifdef PTY_ITERATION ＠＠ -283,6 +297,7 ＠＠ } } return -1; +#endif /* !glibc */ } #endif /* HAVE_PTYS */ -- Andreas Jaeger SuSE Labs aj(a)suse.de private aj(a)arthur.rhein-neckar.de