HP-UX Reference (11i v1 00/12) - 5 Miscellaneous Topics, 7 Device (Special) Files, 9 General Information, Index (vol 9)

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termio(7) termio(7)

character is treated as a normal data character.

NL (ASCII LF) special character on input and is recognized if ICANON ﬂag is enabled. It is

the line delimiter (\n). If ICANON is not enabled, the NL character is treated as a nor-

mal data character.

EOL (ASCII NUL) special character on input and is recognized if ICANON is enabled. EOL is

an additional line delimiter similar to NL. It is not normally used. If ICANON is not

enabled, the EOL character is treated as a normal data character.

EOL2 (disabled) special character on input and is recognized if ICANON is enabled. EOL2 is

an additional line delimiter similar to EOL. It is not normally used. If ICANON is not

enabled, the EOL2 character is treated as a normal data character.

SUSP (disabled) special character recognized on input. If ISIG is enabled, receipt of the

SUSP character causes a SIGTSTP signal to be sent to all processes in the foreground

process group for which the terminal is the controlling terminal, and the SUSP character

is discarded when processed. If ISIG is not enabled, the SUSP character is treated as a

normal data character. Command interpreter processes typically set SUSP to Control-Z.

DSUSP (disabled) special character recognized on input. If ISIG

is enabled, and a process in

the foreground process group attempts to read the

DSUSP

character, a SIGTSTP signal

is sent to all processes in the foreground process group for which the terminal is the con-

trolling terminal, and the

DSUSP character is then discarded. If ISIG is not enabled,

the DSUSP character is treated as a normal data character. Note that DSUSP is similar

to SUSP except that the signal is sent when a process in the foreground process group

attempts to read the DSUSP character, rather than when it is typed.

STOP (Control-S or ASCII DC3) special character on both input and output. If IXON (output

control) is enabled, processing of the

STOP character temporarily suspends output to the

terminal device. This is useful with CRT terminals to prevent output from disappearing

before it can be read. While output is suspended and IXON is enabled, STOP characters

are ignored and not read. If

IXON is enabled, the STOP character is discarded when

processed. If IXON is not enabled, the STOP character is treated as a normal data char-

acter. If IXOFF (input control) is enabled, the system sends a STOP character to the

terminal device when the number of unread characters in the input queue is approach-

ing a system speciﬁed limit. This is an attempt to prevent this buffer from overﬂowing

by telling the terminal device to stop sending data.

START (Control-Q or ASCII DC1) special character on both input and output. If

IXON (output

control) is enabled, processing of the

START character resumes output that has been

suspended. While output is not suspended and IXON is enabled, START characters are

ignored and not read. If

IXON is enabled, the START character is discarded when pro-

cessed. If

IXON is not enabled, the START character is treated as a normal data charac-

ter. If IXOFF (input control) is enabled, the system sends a START character to the ter-

minal device when the input queue has drained to a certain system-deﬁned level. This

occurs when the input queue is no longer in danger of possibly overﬂowing.

CR (ASCII CR) special character on input is recognized if ICANON is enabled. When

ICANON and ICRNL are enabled and IGNCR is not enabled, this character is

translated into a NL, and has the same affect as the NL character. If ICANON

and

IGNCR are enabled, the CR character is ignored. If ICANON is enabled and both

ICRNL and IGNCR are not enabled, the CR character is treated as a normal data char-

acter.

LNEXT (disabled) special character recognized on input. Causes the special meaning of the next

character to be ignored. This works for all special characters speciﬁed above. It allows

characters to be input that would otherwise be interpreted by the system for a special

function.

The special characters are assigned their default character values when the terminal port is opened. The

default values used are those speciﬁed by the System V Interface Deﬁnition, Third Edition (SVID3), except

for the WERASE (Ctrl-W) and LNEXT (Ctrl-V) characters which are set to _POSIX_VDISABLE to maintain

binary compatibility with previous releases of HP-UX. The default character values assigned when the port

is opened can be changed for all ports on a system wide basis through the use of the

stty command (see

stty(1)). The character values may also be changed for a speciﬁc port after it is opened using the

stty

command. The NL and CR characters cannot be changed or disabled. The character values for the

Section 7−−164 − 5 − HP-UX Release 11i: December 2000

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