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tcsetattr(3) Library Functions Manual tcsetattr(3) NAME tcsetattr - Sets the parameters associated with the terminal LIBRARY Standard C Library (libc.so, libc.a) SYNOPSIS #include <termios.h> int tcsetattr( int filedes, int optional_actions, struct termios *termios_p ); STANDARDS Interfaces documented on this reference page conform to industry stan- dards as follows: tcsetattr(): XPG4, XPG4-UNIX Refer to the standards(5) reference page for more information about in- dustry standards and associated tags. PARAMETERS Specifies an open file descriptor associated with a terminal. Speci- fies the options defining how the parameters will be set. Points to a termios structure containing the terminal parameters. DESCRIPTION The tcsetattr() function sets the parameters associated with the termi- nal referred to by the open file descriptor filedes from the termios structure referenced by termios_p as follows: If optional_actions is TCSANOW, the change will occur immediately. If optional_actions is TC- SADRAIN, the change will occur after all output written to filedes has been transmitted. This function should be used when changing parameters that affect output. If optional_actions is TCSAFLUSH, the change will occur after all output written to filedes has been transmitted, and all input so far received but not read will be discarded before the change is made. If the output baud rate stored in the termios structure pointed to by the termios_p parameter is the zero baud rate, B0, the modem control lines will no longer be asserted. Normally, this will disconnect the line. If the input baud rate stored in the termios structure pointed to by the termios_p parameter is 0 (zero), the input baud rate given to the hardware will be the same as the output baud rate stored in the termios structure. Attempts to use the tcsetattr() function from a process which is a mem- ber of a background process group on a filedes associated with its con- trolling terminal causes the process group to be sent a SIGTTOU signal. 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, 0 (zero) is returned. Otherwise, -1 is re- turned and errno is set to indicate the error. ERRORS The tcsetattr() function sets errno to the specified values for the following conditions: The filedes parameter is not a valid file descriptor. A signal inter- rupted tcsetattr(). The optional_actions parameter is not a proper value, or an attempt was made to change an attribute represented in the termios structure to an unsupported value. The file associated with the filedes parameter is not a terminal. RELATED INFORMATION Functions: cfgetispeed (3), tcgetattr (3) Standards: standards(5) delim off tcsetattr(3)