diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux')
-rw-r--r-- | sysdeps/unix/sysv/linux/tcsendbrk.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tcsendbrk.c b/sysdeps/unix/sysv/linux/tcsendbrk.c new file mode 100644 index 0000000000..c8fbcbb525 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tcsendbrk.c @@ -0,0 +1,45 @@ +/* Send break to terminal. + Copyright (C) 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <stddef.h> +#include <termios.h> +#include <sys/ioctl.h> + +/* Send zero bits on FD. */ +int +tcsendbreak (int fd, int duration) +{ + /* The break lasts 0.25 to 0.5 seconds if DURATION is zero, + and an implementation-defined period if DURATION is nonzero. + We define a positive DURATION to be number of milliseconds to break. */ + if (duration <= 0) + return __ioctl (fd, TCSBRK, 0); + +#ifdef TCSBRKP + /* Probably Linux-specific: a positive third TCSBRKP ioctl argument is + defined to be the number of 100ms units to break. */ + return __ioctl (fd, TCSBRKP, (duration + 99) / 100); +#else + /* ioctl can't send a break of any other duration for us. + This could be changed to use trickery (e.g. lower speed and + send a '\0') to send the break, but for now just return an error. */ + __set_errno (EINVAL); + return -1; +#endif +} |