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tcsendbreak(3) Library Functions Manual tcsendbreak(3) NAME tcsendbreak - Sends a break on an asynchronous serial data line LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <termios.h> int tcsendbreak( int filedes, int duration); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: tcsendbreak(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies an open file descriptor. Specifies the number of millisec- onds that zero-valued bits are transmitted. If the value of the dura- tion parameter is 0 (zero), transmission of zero-valued bits is for 250 milliseconds. If duration is not 0, transmission of zero-valued bits is for duration milliseconds. DESCRIPTION If the terminal is using asynchronous serial data transmission, the tc- sendbreak() function causes transmission of a continuous stream of zero-valued bits for a specific duration. If the terminal is not using asynchronous serial data transmission, the tcsendbreak() function re- turns without taking any action. A process group is sent a SIGTTOU signal if the tcsendbreak() function is called from one of its member processes. If the calling process is blocking or ignoring SIGTTOU signals, the process is allowed to perform the operation and no signal is sent. RETURN VALUES Upon successful completion, a value of 0 (zero) is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS The tcsendbreak() function sets errno to the specified values for the following conditions: The filedes parameter does not specify a valid open file descriptor. The file associated with the filedes parameter is not a terminal. RELATED INFORMATION Functions: tcdrain(3), tcflow(3), tcflush(3) Files: termios(4) Standards: standards(5) delim off tcsendbreak(3)