tcflow - Performs flow control functions
Standard C Library (libc.so, libc.a)
Interfaces documented on this reference page conform to industry standards as follows:
tcflow(): XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
The tcflow() function suspends transmission or reception of data on the object referred to by the filedes parameter, depending on the value of the action parameter.
A process group is sent a SIGTTOU signal if the tcflow() 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.
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.
The tcflow() function sets errno to the specified values for the following conditions:
The filedes parameter does not specify a valid file descriptor. The action parameter is not a supported value. The file associated with the filedes parameter is not a terminal.
Functions: tcdrain(3), tcflush(3), tcsendbreak(3)
Standards: standards(5) delim off