1tcflush(3C)              Standard C Library Functions              tcflush(3C)
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NAME

6       tcflush  -  flush  non-transmitted  output data, non-read input data or
7       both
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SYNOPSIS

10       #include <termios.h>
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12       int tcflush(int fildes, int queue_selector);
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DESCRIPTION

16       Upon successful completion, tcflush()  discards  data  written  to  the
17       object referred to by fildes (an open file descriptor associated with a
18       terminal) but not transmitted, or data received but not read, depending
19       on the value of queue_selector:
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21           o      If  queue_selector  is TCIFLUSH it flushes data received but
22                  not read.
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24           o      If queue_selector is TCOFLUSH it flushes  data  written  but
25                  not transmitted.
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27           o      If queue_selector is TCIOFLUSH it flushes both data received
28                  but not read and data written but not transmitted.
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31       Attempts to use tcflush() from a process which is a member of  a  back‐
32       ground process group on a fildes associated with its controlling termi‐
33       nal, will cause the process group to be sent a SIGTTOU signal.  If  the
34       calling process is blocking or ignoring SIGTTOU signals, the process is
35       allowed to perform the operation, and no signal is sent.
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RETURN VALUES

38       Upon successful completion, 0 is returned. Otherwise,  −1  is  returned
39       and errno is set to indicate the error.
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ERRORS

42       The tcflush() function will fail if:
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44       EBADF     The fildes argument is not a valid file descriptor.
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47       EINVAL    The queue_selector argument is not a supported value.
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50       ENOTTY    The file associated with fildes is not a terminal.
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54       The tcflush() function may fail if:
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56       EIO    The  process  group  of the writing process is orphaned, and the
57              writing process is not ignoring or blocking SIGTTOU.
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ATTRIBUTES

61       See attributes(5) for descriptions of the following attributes:
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66       ┌─────────────────────────────┬───────────────────────────────┐
67       │      ATTRIBUTE TYPE         │       ATTRIBUTE VALUE         │
68       ├─────────────────────────────┼───────────────────────────────┤
69       │Interface Stability          │Standard                       │
70       ├─────────────────────────────┼───────────────────────────────┤
71       │MT-Level                     │MT-Safe, and Async-Signal-Safe │
72       └─────────────────────────────┴───────────────────────────────┘
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SEE ALSO

75       tcdrain(3C), attributes(5), standards(5), termio(7I)
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79SunOS 5.11                        14 Aug 2002                      tcflush(3C)
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