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Disconnect a communications line
#include <termios.h>
int tcdropline( int fd,
int duration );
- fd
- A file descriptor that's associated with the line that you want to
disconnect.
- duration
- The number of milliseconds that you want to drop the line for.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The tcdropline() function initiates a disconnect condition on
the communication line associated with the opened file descriptor
indicated by fd.
The disconnect condition lasts 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.
- 0
- Success.
- -1
- An error occurred
(errno is set).
- EBADF
- Invalid fd argument.
- ENOSYS
- The resource manager associated with fd doesn't support
this call.
- ENOTTY
- The argument fd doesn't refer to a terminal device.
#include <termios.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
int main( void )
{
int fd;
fd = open( "/dev/ser1", O_RDWR );
/* Disconnect for 500 milliseconds */
tcdropline( fd, 500 );
close( fd );
return EXIT_SUCCESS;
}
QNX 4
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
tcdrain(),
tcflow(),
tcflush()
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