tcsendbreak3
Send a continuous stream of zero-valued bits
Usage
#include <termios.h>
int tcsendbreak(int fd, int duration);
Library
Standard C library (libc, -lc)
Overview
tcsendbreak() transmits a continuous stream of zero-valued bits for a specific duration, if the terminal is using asynchronous serial data transmission.
If duration is zero, it transmits zero-valued bits for at least 0.25 seconds, and not more than 0.5 seconds.
If duration is not zero, it sends zero-valued bits for some implementation-defined length of time.
If the terminal is not using asynchronous serial data transmission, tcsendbreak() returns without taking any action.
Return value
|
on success. |
|---|---|
|
on failure and set errno to indicate the error. |
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| tcsendbreak() | Thread safety | MT-Safe |
Versions
The effect of a nonzero duration with tcsendbreak() varies. SunOS specifies a break of duration * N seconds, where N is at least 0.25, and not more than 0.5. Linux, AIX, DU, Tru64 send a break of duration milliseconds. FreeBSD and NetBSD and HP-UX and MacOS ignore the value of duration. Under Solaris and UnixWare, tcsendbreak() with nonzero duration behaves like tcdrain(3).
Releases
19 releases since Debian 1.1 (Buzz); the text changed 15 times.