termios(M)

termios -- POSIX.1 general terminal interface

Syntax

#include <sys/termios.h>

Description

This entry discusses the POSIX.1 termios extensions to the termio(M) interface. See termio(M) for a discussion of the general terminal interface supported in the current release.

The following library functions (defined on the termios(S) manual page) should be used instead of ioctl(S):

tcgetattr: Get attributes using a struct termios.
tcsetattr: Set attributes using a struct termios.
cfgetispeed: Get input line speed.
cfsetispeed: Set input line speed.
cfgetospeed: Get output line speed.
cfsetospeed: Set output line speed.
tcdrain: Wait for completion of output transmission.
tcflow: Suspend transmit or receive.
tcflush: Discard pending input and/or output.
tcsendbreak: Send a BREAK character.
tcgetpgrp: Get the ID of the foreground process group.
tcsetpgrp: Set the ID of the foreground process group.

The functions tcgetattr and tcsetattr use the termios structure, defined in the file <sys/termio.h> (included by <sys/termios.h>):

   #define	NCCS	21
   struct termios {
       tcflag_t      c_iflag;     / input modes /
       tcflag_t      c_oflag;     / output modes /
       tcflag_t      c_cflag;     / control modes /
       tcflag_t      c_lflag;     / local (line discipline) modes /
       char          c_line;      / line discipline /
       cc_t          c_cc[NCCS];  / control chars /
   };

For backward compatibility when the -a ods30 option is used with cc(CP), the following alternative version of the termios structure is also defined:

   #define	NCCS	13
   struct termios {
       tcflag_t      c_iflag;     / input modes /
       tcflag_t      c_oflag;     / output modes /
       tcflag_t      c_cflag;     / control modes /
       tcflag_t      c_lflag;     / local (line discipline) modes /
       char          c_line;      / line discipline /
       cc_t          c_cc[NCCS];  / control chars /
       char          __c_xxx;     / used for input baud rate for iBCS2 /
       char          __c_yyy;     / used for output baud rate for iBCS2 /
   };

Files

/usr/include/sys/termios.h
/usr/include/sys/termio.h: definitions for struct termios and ioctl commands

Standards conformance

termios is conformant with:

ISO/IEC 99451:1990, Information technology Portable Operating System Interface (POSIX) Part 1: System Application Program Interface (API) [C Language] (IEEE Std 1003.11990);
X/Open CAE Specification, System Interfaces and Headers, Issue 4, 1992.

termios(M)

Syntax

Description

Files

See also

Standards conformance