Wait until all output has been transmitted to a device
#include <termios.h> int tcdrain( int fildes );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The tcdrain() function waits until all output has been physically transmitted to the device associated with fildes, or until a signal is received.
#include <termios.h> #include <fcntl.h> #include <unistd.h> #include <stdlib.h> int main( void ) { int fildes; fildes = open( "/dev/ser1", O_RDWR ); write( fildes, "ATH", 3 ); /* Wait for data to transmit before returning */ tcdrain( fildes ); close( fildes ); return EXIT_SUCCESS; }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |