Updated: April 19, 2023 |
Assert a break condition over a communications line
#include <termios.h> int tcsendbreak( int filedes, int duration );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The tcsendbreak() function asserts a break condition over the communication line associated with the opened file descriptor indicated by filedes.
The break condition lasts for at least duration milliseconds, or approximately 300 milliseconds if duration is zero. The system rounds the effective value of duration up to the next highest supported interval, which is typically a multiple of 100 milliseconds.
#include <termios.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> int main( void ) { int fd; fd = open( "/dev/ser1", O_RDWR ); /* Send a 500 millisecond break */ tcsendbreak( fd, 500 ); close( fd ); return EXIT_SUCCESS; }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |