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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [sysvi386/] [tcline.c] - Rev 859
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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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