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tcsendbreak(3) [osf1 man page]

tcsendbreak(3)						     Library Functions Manual						    tcsendbreak(3)

NAME
tcsendbreak - Sends a break on an asynchronous serial data line LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <termios.h> int tcsendbreak( int filedes, int duration); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: tcsendbreak(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies an open file descriptor. Specifies the number of milliseconds that zero-valued bits are transmitted. If the value of the dura- tion parameter is 0 (zero), transmission of zero-valued bits is for 250 milliseconds. If duration is not 0, transmission of zero-valued bits is for duration milliseconds. DESCRIPTION
If the terminal is using asynchronous serial data transmission, the tcsendbreak() function causes transmission of a continuous stream of zero-valued bits for a specific duration. If the terminal is not using asynchronous serial data transmission, the tcsendbreak() function returns without taking any action. A process group is sent a SIGTTOU signal if the tcsendbreak() 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. RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
The tcsendbreak() function sets errno to the specified values for the following conditions: The filedes parameter does not specify a valid open file descriptor. The file associated with the filedes parameter is not a terminal. RELATED INFORMATION
Functions: tcdrain(3), tcflow(3), tcflush(3) Files: termios(4) Standards: standards(5) delim off tcsendbreak(3)

Check Out this Related Man Page

tcflow(3)						     Library Functions Manual							 tcflow(3)

NAME
tcflow - Performs flow control functions LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <termios.h> int tcflow( int filedes, int action); STANDARDS
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. PARAMETERS
Specifies an open file descriptor. Specifies one of the following: Suspend output. Restart suspended output. Transmit a STOP character, which is intended to cause the terminal device to stop transmitting data to the system. Transmit a START character, which is intended to cause the terminal device to start transmitting data to the system. DESCRIPTION
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. 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 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. RELATED INFORMATION
Functions: tcdrain(3), tcflush(3), tcsendbreak(3) Files: termios(4) Standards: standards(5) delim off tcflow(3)
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