1 #define _NO_MACROS
2 #include <sys/unistd.h>
3 #include <sys/termios.h>
4 #include <errno.h>
5
6 int
tcsendbreak(int fd,int dur)7 tcsendbreak (int fd, int dur) {
8 do {
9 if (_ioctl (fd, _TCSBRK, 0) == -1)
10 return -1;
11 } while (dur--);
12 return 0;
13 }
14
15 int
tcdrain(int fd)16 tcdrain (int fd) {
17 return _ioctl (fd, _TCSBRK, 1);
18 }
19
20 int
tcflush(int fd,int what)21 tcflush(int fd, int what) {
22 return _ioctl (fd, _TCFLSH, what);
23 }
24
25 /*
26 * I'm not positive about this function. I *think* it's right,
27 * but I could be missing something.
28 */
29
30 int
tcflow(int fd,int action)31 tcflow (int fd, int action) {
32 struct termios t;
33
34 switch (action) {
35 case TCOOFF:
36 case TCOON:
37 return _ioctl (fd, _TCXONC, action);
38 /*
39 * Here is where I'm not terribly certain. 1003.1 says:
40 * if action is TCIOFF, the system shall transmit a STOP
41 * character, which is intended to cause the terminal device
42 * to stop transmitting data to the system. (Similarly for
43 * TCION.)
44 * I *assume* that means I find out what VSTOP for the
45 * terminal device is, and then write it. 1003.1 also does
46 * not say what happens if c_cc[VSTOP] is _POSIX_VDISABLE;
47 * I assume it should reaturn EINVAL, so that's what I do.
48 * Anyway, here's the code. It might or might not be right.
49 */
50 case TCIOFF:
51 if (tcgetattr (fd, &t) == -1)
52 return -1;
53 if (tcgetattr (fd, &t) == -1)
54 return -1;
55 #ifdef _POSIX_VDISABLE
56 if (t.c_cc[VSTOP] == _POSIX_VDISABLE) {
57 errno = EINVAL;
58 return -1;
59 }
60 #endif
61 if (write (fd, &t.c_cc[VSTOP], 1) == 1)
62 return 0;
63 else
64 return -1;
65 case TCION:
66 if (tcgetattr (fd, &t) == -1)
67 return -1;
68 if (tcgetattr (fd, &t) == -1)
69 return -1;
70 #ifdef _POSIX_VDISABLE
71 if (t.c_cc[VSTART] == _POSIX_VDISABLE) {
72 errno = EINVAL;
73 return -1;
74 }
75 #endif
76 if (write (fd, &t.c_cc[VSTART], 1) == 1)
77 return 0;
78 else
79 return -1;
80 default:
81 errno = EINVAL;
82 return -1;
83 }
84 }
85