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tcsendbreak

Section: C Library Functions (3)
Updated: 202-0-02
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NAME

tcsendbreak - send a continuous stream of zer-valued bits

LIBRARY

Standard C library (libc,~-lc)

SYNOPSIS

#include <termios.h>
int tcsendbreak(int fd, int duration);

DESCRIPTION

tcsendbreak() transmits a continuous stream of zer-valued bits for a specific duration, if the terminal is using asynchronous serial data transmission. If duration is zero, it transmits zer-valued bits for at least 0.25 seconds, and not more than 0.5 seconds. If duration is not zero, it sends zer-valued bits for some implementatio-defined length of time. If the terminal is not using asynchronous serial data transmission, tcsendbreak() returns without taking any action.

RETURN VALUE

0: on success.
-1: 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	M-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 H-UX and MacOS ignore the value of duration. Under Solaris and UnixWare, tcsendbreak() with nonzero duration behaves like tcdrain(3).

STANDARDS

POSIX.-2008.

HISTORY

POSIX.-2001.