General termios

[Shaun Jackman]

termios only depends on ioctl and the various TCxxx and TIOCxxx ioctl
defines. If each function were wrapped in an ifdef Txxx, it should be
possible to move termios to a general source.

Is it better to leave the function undefined, or define the function
to return ENOSYS? Is posix or unix a better home for termios?

Cheers,
Shaun

Index: libc/sys/linux/termios.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/sys/linux/termios.c,v
retrieving revision 1.3
diff -u -r1.3 termios.c
--- libc/sys/linux/termios.c	26 Aug 2002 18:56:08 -0000	1.3
+++ libc/sys/linux/termios.c	2 Jun 2006 16:12:51 -0000
@@ -12,7 +12,12 @@
 int
  tcgetattr(int fd,struct termios *termios_p)
 {
+#ifdef TCGETS
   return ioctl(fd,TCGETS,termios_p);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
 }


@@ -22,15 +27,21 @@
   int cmd;

   switch (optional_actions) {
+#ifdef TCSETS
     case TCSANOW:
       cmd = TCSETS;
     break;
+#endif
+#ifdef TCSETSW
     case TCSADRAIN:
       cmd = TCSETSW;
     break;
+#endif
+#ifdef TCSETSF
     case TCSAFLUSH:
       cmd = TCSETSF;
     break;
+#endif
     default:
       errno = EINVAL;
       return -1;
@@ -44,29 +55,49 @@
 {
   int p;

+#ifdef TIOCGPGRP
   if (ioctl(fd,TIOCGPGRP,&p) < 0)
     return (pid_t)-1;
   return (pid_t)p;
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
 }


 int
  tcsetpgrp(int fd, pid_t pid)
 {
+#ifdef TIOCSPGRP
   int p = (int)pid;
   return ioctl(fd,TIOCSPGRP,&p);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
 }
  #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */

 int
  tcflow (int fd, int action)
 {
+#ifdef TCXONC
   return ioctl (fd, TCXONC, action);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
 }

 int
  tcflush (int fd, int queue_selector)
 {
+#ifdef TCFLSH
   return ioctl (fd, TCFLSH, queue_selector);
+#else
+	errno = ENOSYS;
+	return -1;
+#endif
 }