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#define _NO_MACROS
#include <sys/unistd.h>
#include <sys/termios.h>
#include <errno.h>
int
tcsendbreak (int fd, int dur) {
do {
if (_ioctl (fd, _TCSBRK, 0) == -1)
return -1;
} while (dur--);
return 0;
}
int
tcdrain (int fd) {
return _ioctl (fd, _TCSBRK, 1);
}
int
tcflush(int fd, int what) {
return _ioctl (fd, _TCFLSH, what);
}
/*
* I'm not positive about this function. I *think* it's right,
* but I could be missing something.
*/
int
tcflow (int fd, int action) {
struct termios t;
switch (action) {
case TCOOFF:
case TCOON:
return _ioctl (fd, _TCXONC, action);
/*
* Here is where I'm not terribly certain. 1003.1 says:
* if action is TCIOFF, the system shall transmit a STOP
* character, which is intended to cause the terminal device
* to stop transmitting data to the system. (Similarly for
* TCION.)
* I *assume* that means I find out what VSTOP for the
* terminal device is, and then write it. 1003.1 also does
* not say what happens if c_cc[VSTOP] is _POSIX_VDISABLE;
* I assume it should reaturn EINVAL, so that's what I do.
* Anyway, here's the code. It might or might not be right.
*/
case TCIOFF:
if (tcgetattr (fd, &t) == -1)
return -1;
if (tcgetattr (fd, &t) == -1)
return -1;
#ifdef _POSIX_VDISABLE
if (t.c_cc[VSTOP] == _POSIX_VDISABLE) {
errno = EINVAL;
return -1;
}
#endif
if (write (fd, &t.c_cc[VSTOP], 1) == 1)
return 0;
else
return -1;
case TCION:
if (tcgetattr (fd, &t) == -1)
return -1;
if (tcgetattr (fd, &t) == -1)
return -1;
#ifdef _POSIX_VDISABLE
if (t.c_cc[VSTART] == _POSIX_VDISABLE) {
errno = EINVAL;
return -1;
}
#endif
if (write (fd, &t.c_cc[VSTART], 1) == 1)
return 0;
else
return -1;
default:
errno = EINVAL;
return -1;
}
}
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