FIONREAD, TIOCINQ, TIOCOUTQ, TCFLSH, TIOCSERGETLSR
buffer count and flushing
- Provided by: manpages-dev (Version: 6.17-1)
- Source: manpages
- Report a bug
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <asm/termbits.h> /* Definition of constants */ #include <sys/ioctl.h>
int ioctl(int fd, FIONREAD, int *argp); int ioctl(int fd, TIOCINQ, int *argp); int ioctl(int fd, TIOCOUTQ, int *argp); int ioctl(int fd, TCFLSH, int arg); int ioctl(int fd, TIOCSERGETLSR, int *argp);
DESCRIPTION
- FIONREAD
- Get the number of bytes in the input buffer.
- TIOCINQ
- Same as FIONREAD.
- TIOCOUTQ
- Get the number of bytes in the output buffer.
- TCFLSH
- Equivalent to tcflush(fd, arg).
- See tcflush(3) for the argument values TCIFLUSH, TCOFLUSH, TCIOFLUSH.
- TIOCSERGETLSR
- Get line status register. Status register has TIOCSER_TEMT bit set when output buffer is empty and also hardware transmitter is physically empty.
- Does not have to be supported by all serial tty drivers.
- tcdrain(3) does not wait and returns immediately when TIOCSER_TEMT bit is set.
RETURN VALUE
On success, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.