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comparison src/sysdep.c @ 535:c69610198c35

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[xemacs-hg @ 2001-05-14 04:52:02 by martinb] Eliminate the need to define HAVE_PTYS in s&m files.
author martinb
date Mon, 14 May 2001 04:52:49 +0000
parents e159a0b4bed4
children 666d73d6ac56
comparison
equal deleted inserted replaced
534:a0266879cecf 535:c69610198c35
186 as well as the O_NDELAY, but that it fails without this. */ 186 as well as the O_NDELAY, but that it fails without this. */
187 /* For AIX: Apparently need this for non-blocking reads on sockets. 187 /* For AIX: Apparently need this for non-blocking reads on sockets.
188 It seems that O_NONBLOCK applies only to FIFOs? From 188 It seems that O_NONBLOCK applies only to FIFOs? From
189 lowry@watson.ibm.com (Andy Lowry). */ 189 lowry@watson.ibm.com (Andy Lowry). */
190 /* #### Should this be conditionalized on FIONBIO? */ 190 /* #### Should this be conditionalized on FIONBIO? */
191 #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS)) || defined (AIX) 191 #if defined (STRIDE) || defined (pfa) || defined (AIX)
192 { 192 {
193 int one = 1; 193 int one = 1;
194 ioctl (fd, FIONBIO, &one); 194 ioctl (fd, FIONBIO, &one);
195 } 195 }
196 #endif 196 #endif
887 #else 887 #else
888 return -1; 888 return -1;
889 #endif 889 #endif
890 } 890 }
891 891
892 #ifdef HAVE_PTYS
893
894 /* Set up the proper status flags for use of a pty. */ 892 /* Set up the proper status flags for use of a pty. */
895 893
896 void 894 void
897 setup_pty (int fd) 895 setup_pty (int fd)
898 { 896 {
899 /* I'm told that TIOCREMOTE does not mean control chars
900 "can't be sent" but rather that they don't have
901 input-editing or signaling effects.
902 That should be good, because we have other ways
903 to do those things in Emacs.
904 However, telnet mode seems not to work on 4.2.
905 So TIOCREMOTE is turned off now. */
906
907 /* Under hp-ux, if TIOCREMOTE is turned on, some calls
908 will hang. In particular, the "timeout" feature (which
909 causes a read to return if there is no data available)
910 does this. Also it is known that telnet mode will hang
911 in such a way that Emacs must be stopped (perhaps this
912 is the same problem).
913
914 If TIOCREMOTE is turned off, then there is a bug in
915 hp-ux which sometimes loses data. Apparently the
916 code which blocks the master process when the internal
917 buffer fills up does not work. Other than this,
918 though, everything else seems to work fine.
919
920 Since the latter lossage is more benign, we may as well
921 lose that way. -- cph */
922 #if defined (FIONBIO) && defined (SYSV_PTYS)
923 {
924 int on = 1;
925 ioctl (fd, FIONBIO, &on);
926 }
927 #endif
928 #ifdef IBMRTAIX 897 #ifdef IBMRTAIX
929 /* On AIX, the parent gets SIGHUP when a pty attached child dies. So, we */ 898 /* On AIX, the parent gets SIGHUP when a pty attached child dies. So, we */
930 /* ignore SIGHUP once we've started a child on a pty. Note that this may */ 899 /* ignore SIGHUP once we've started a child on a pty. Note that this may */
931 /* cause EMACS not to die when it should, i.e., when its own controlling */ 900 /* cause EMACS not to die when it should, i.e., when its own controlling */
932 /* tty goes away. I've complained to the AIX developers, and they may */ 901 /* tty goes away. I've complained to the AIX developers, and they may */
933 /* change this behavior, but I'm not going to hold my breath. */ 902 /* change this behavior, but I'm not going to hold my breath. */
934 signal (SIGHUP, SIG_IGN); 903 signal (SIGHUP, SIG_IGN);
935 #endif 904 #endif /* IBMRTAIX */
905
936 #ifdef TIOCPKT 906 #ifdef TIOCPKT
937 /* In some systems (Linux through 2.0.0, at least), packet mode doesn't 907 /* In some systems (Linux through 2.0.0, at least), packet mode doesn't
938 get cleared when a pty is closed, so we need to clear it here. 908 get cleared when a pty is closed, so we need to clear it here.
939 Linux pre2.0.13 contained an attempted fix for this (from Ted Ts'o, 909 Linux pre2.0.13 contained an attempted fix for this (from Ted Ts'o,
940 tytso@mit.edu), but apparently it messed up rlogind and telnetd, so he 910 tytso@mit.edu), but apparently it messed up rlogind and telnetd, so he
942 */ 912 */
943 { 913 {
944 int off = 0; 914 int off = 0;
945 ioctl (fd, TIOCPKT, (char *)&off); 915 ioctl (fd, TIOCPKT, (char *)&off);
946 } 916 }
947 #endif 917 #endif /* TIOCPKT */
948 } 918 }
949 #endif /* HAVE_PTYS */
950 919
951 920
952 /************************************************************************/ 921 /************************************************************************/
953 /* TTY control */ 922 /* TTY control */
954 /************************************************************************/ 923 /************************************************************************/