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More portable code for setting raw mode.

--- a/src/runtime/config-unix-64.h

+++ b/src/runtime/config-unix-64.h

@@ -74,8 +74,14 @@

 #endif  /* WANT_STDIO */

     return -1;

   }

-  cfmakeraw(&new);

-  if (tcsetattr(0, TCSANOW, &new)) {

+  new = old;

+  new.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP

+                   | INLCR | IGNCR | ICRNL | IXON);

+  new.c_oflag &= ~OPOST;

+  new.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);

+  new.c_cflag &= ~(CSIZE | PARENB);

+  new.c_cflag |= CS8;

+  if (tcsetattr(0, TCSAFLUSH, &new)) {

 #if WANT_STDIO

     fprintf(stderr, "tcsetattr 1 failed: errno=%d\n", errno);

 #endif  /* WANT_STDIO */

@@ -82,7 +88,7 @@

     return -1;

   }

   r = read(0, &c, 1);

-  if (tcsetattr(0, TCSANOW, &old)) {

+  if (tcsetattr(0, TCSAFLUSH, &old)) {

 #if WANT_STDIO

     fprintf(stderr, "tcsetattr 2 failed: errno=%d\n", errno);

 #endif  /* WANT_STDIO */

-- 

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