tcdrain(3)tcdrain(3)NAMEtcdrain - Wait for output to complete
SYNOPSIS
#include <termios.h>
int tcdrain(
int filedes );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
tcdrain(): XSH4.2
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies an open file descriptor.
DESCRIPTION
The tcdrain() function waits until all output written to the object
referred to by the filedes parameter has been transmitted.
A process group is sent a SIGTTOU signal if the tcdrain() function is
called from one of its member processes. If the calling process is
blocking or ignoring SIGTTOU signals, the process is allowed to perform
the operation and no signal is sent.
[Tru64 UNIX] The tcdrain() function, which suspends the calling
process until the request is completed, is redefined so that only the
calling thread is suspended.
RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. Otherwise,
a value of -1 is returned and errno is set to indicate the error.
ERRORS
The tcdrain() function sets errno to the specified values for the fol‐
lowing conditions:
The filedes parameter does not specify a valid file descriptor. A sig‐
nal interrupted the tcdrain() function. The file associated with the
filedes parameter is not a terminal.
EXAMPLE
To wait until all output has been transmitted, enter:
rc = tcdrain(stdout);
SEE ALSO
Functions: tcflow(3), tcflush(3), tcsendbreak(3)
Standards: standards(5)tcdrain(3)
