1TERMIOS(3)                 Linux Programmer's Manual                TERMIOS(3)
2
3
4

NAME

6       termios,  tcgetattr,  tcsetattr, tcsendbreak, tcdrain, tcflush, tcflow,
7       cfmakeraw, cfgetospeed, cfgetispeed, cfsetispeed,  cfsetospeed,  cfset‐
8       speed - get and set terminal attributes, line control, get and set baud
9       rate
10

SYNOPSIS

12       #include <termios.h>
13       #include <unistd.h>
14
15       int tcgetattr(int fd, struct termios *termios_p);
16
17       int tcsetattr(int fd, int optional_actions,
18                     const struct termios *termios_p);
19
20       int tcsendbreak(int fd, int duration);
21
22       int tcdrain(int fd);
23
24       int tcflush(int fd, int queue_selector);
25
26       int tcflow(int fd, int action);
27
28       void cfmakeraw(struct termios *termios_p);
29
30       speed_t cfgetispeed(const struct termios *termios_p);
31
32       speed_t cfgetospeed(const struct termios *termios_p);
33
34       int cfsetispeed(struct termios *termios_p, speed_t speed);
35
36       int cfsetospeed(struct termios *termios_p, speed_t speed);
37
38       int cfsetspeed(struct termios *termios_p, speed_t speed);
39
40   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
41
42       cfsetspeed(), cfmakeraw(): _BSD_SOURCE
43

DESCRIPTION

45       The termios functions describe a general  terminal  interface  that  is
46       provided to control asynchronous communications ports.
47
48   The termios structure
49       Many  of the functions described here have a termios_p argument that is
50       a pointer to a termios structure.  This structure contains at least the
51       following members:
52
53           tcflag_t c_iflag;      /* input modes */
54           tcflag_t c_oflag;      /* output modes */
55           tcflag_t c_cflag;      /* control modes */
56           tcflag_t c_lflag;      /* local modes */
57           cc_t     c_cc[NCCS];   /* special characters */
58
59       The  values  that  may be assigned to these fields are described below.
60       In the case of the first four bit-mask fields, the definitions of  some
61       of  the associated flags that may be set are exposed only if a specific
62       feature test macro (see feature_test_macros(7)) is defined, as noted in
63       brackets ("[]").
64
65       In  the  descriptions below, "not in POSIX" means that the value is not
66       specified in POSIX.1-2001, and "XSI" means that the value is  specified
67       in POSIX.1-2001 as part of the XSI extension.
68
69       c_iflag flag constants:
70
71       IGNBRK Ignore BREAK condition on input.
72
73       BRKINT If  IGNBRK  is  set,  a  BREAK is ignored.  If it is not set but
74              BRKINT is set, then a BREAK causes the input and  output  queues
75              to  be  flushed, and if the terminal is the controlling terminal
76              of a foreground process group, it will cause a SIGINT to be sent
77              to  this  foreground  process  group.   When  neither IGNBRK nor
78              BRKINT are set, a BREAK reads as a null byte ('\0'), except when
79              PARMRK  is  set,  in which case it reads as the sequence \377 \0
80              \0.
81
82       IGNPAR Ignore framing errors and parity errors.
83
84       PARMRK If IGNPAR is not set, prefix a character with a parity error  or
85              framing  error  with  \377  \0.  If neither IGNPAR nor PARMRK is
86              set, read a character with a parity error or  framing  error  as
87              \0.
88
89       INPCK  Enable input parity checking.
90
91       ISTRIP Strip off eighth bit.
92
93       INLCR  Translate NL to CR on input.
94
95       IGNCR  Ignore carriage return on input.
96
97       ICRNL  Translate  carriage  return to newline on input (unless IGNCR is
98              set).
99
100       IUCLC  (not in POSIX) Map uppercase characters to lowercase on input.
101
102       IXON   Enable XON/XOFF flow control on output.
103
104       IXANY  (XSI) Typing any character will restart  stopped  output.   (The
105              default is to allow just the START character to restart output.)
106
107       IXOFF  Enable XON/XOFF flow control on input.
108
109       IMAXBEL
110              (not  in  POSIX) Ring bell when input queue is full.  Linux does
111              not implement this bit, and acts as if it is always set.
112
113       IUTF8 (since Linux 2.6.4)
114              (not in POSIX) Input is UTF8; this allows character-erase to  be
115              correctly performed in cooked mode.
116
117       c_oflag flag constants defined in POSIX.1:
118
119       OPOST  Enable implementation-defined output processing.
120
121       The  remaining  c_oflag  flag  constants  are  defined in POSIX.1-2001,
122       unless marked otherwise.
123
124       OLCUC  (not in POSIX) Map lowercase characters to uppercase on output.
125
126       ONLCR  (XSI) Map NL to CR-NL on output.
127
128       OCRNL  Map CR to NL on output.
129
130       ONOCR  Don't output CR at column 0.
131
132       ONLRET Don't output CR.
133
134       OFILL  Send fill characters for a delay,  rather  than  using  a  timed
135              delay.
136
137       OFDEL  (not  in  POSIX)  Fill character is ASCII DEL (0177).  If unset,
138              fill character is ASCII NUL ('\0').  (Not implemented on Linux.)
139
140       NLDLY  Newline  delay  mask.   Values  are  NL0  and  NL1.    [requires
141              _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
142
143       CRDLY  Carriage  return  delay mask.  Values are CR0, CR1, CR2, or CR3.
144              [requires _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
145
146       TABDLY Horizontal tab delay mask.  Values are TAB0,  TAB1,  TAB2,  TAB3
147              (or  XTABS).   A  value of TAB3, that is, XTABS, expands tabs to
148              spaces  (with  tab  stops  every  eight   columns).    [requires
149              _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
150
151       BSDLY  Backspace  delay  mask.  Values are BS0 or BS1.  (Has never been
152              implemented.)   [requires   _BSD_SOURCE   or   _SVID_SOURCE   or
153              _XOPEN_SOURCE]
154
155       VTDLY  Vertical tab delay mask.  Values are VT0 or VT1.
156
157       FFDLY  Form  feed  delay  mask.   Values  are  FF0  or  FF1.  [requires
158              _BSD_SOURCE or _SVID_SOURCE or _XOPEN_SOURCE]
159
160       c_cflag flag constants:
161
162       CBAUD  (not  in  POSIX)  Baud  speed  mask   (4+1   bits).    [requires
163              _BSD_SOURCE or _SVID_SOURCE]
164
165       CBAUDEX
166              (not in POSIX) Extra baud speed mask (1 bit), included in CBAUD.
167              [requires _BSD_SOURCE or _SVID_SOURCE]
168
169              (POSIX says that the baud speed is stored in the termios  struc‐
170              ture   without   specifying   where   precisely,   and  provides
171              cfgetispeed() and cfsetispeed() for getting at it.  Some systems
172              use  bits  selected by CBAUD in c_cflag, other systems use sepa‐
173              rate fields, for example, sg_ispeed and sg_ospeed.)
174
175       CSIZE  Character size mask.  Values are CS5, CS6, CS7, or CS8.
176
177       CSTOPB Set two stop bits, rather than one.
178
179       CREAD  Enable receiver.
180
181       PARENB Enable parity generation  on  output  and  parity  checking  for
182              input.
183
184       PARODD If  set, then parity for input and output is odd; otherwise even
185              parity is used.
186
187       HUPCL  Lower modem control lines after last process closes  the  device
188              (hang up).
189
190       CLOCAL Ignore modem control lines.
191
192       LOBLK  (not  in POSIX) Block output from a noncurrent shell layer.  For
193              use by shl (shell layers).  (Not implemented on Linux.)
194
195       CIBAUD (not in POSIX) Mask for input speeds.  The values for the CIBAUD
196              bits are the same as the values for the CBAUD bits, shifted left
197              IBSHIFT  bits.   [requires  _BSD_SOURCE  or  _SVID_SOURCE]  (Not
198              implemented on Linux.)
199
200       CMSPAR (not  in  POSIX)  Use  "stick" (mark/space) parity (supported on
201              certain serial devices): if PARODD is set,  the  parity  bit  is
202              always  1;  if  PARODD is not set, then the parity bit is always
203              0).  [requires _BSD_SOURCE or _SVID_SOURCE]
204
205       CRTSCTS
206              (not  in  POSIX)  Enable  RTS/CTS   (hardware)   flow   control.
207              [requires _BSD_SOURCE or _SVID_SOURCE]
208
209       c_lflag flag constants:
210
211       ISIG   When  any  of  the  characters  INTR,  QUIT,  SUSP, or DSUSP are
212              received, generate the corresponding signal.
213
214       ICANON Enable canonical mode (described below).
215
216       XCASE  (not in POSIX; not supported under Linux) If ICANON is also set,
217              terminal  is  uppercase  only.  Input is converted to lowercase,
218              except for characters preceded by \.  On output, uppercase char‐
219              acters  are preceded by \ and lowercase characters are converted
220              to  uppercase.   [requires  _BSD_SOURCE   or   _SVID_SOURCE   or
221              _XOPEN_SOURCE]
222
223       ECHO   Echo input characters.
224
225       ECHOE  If  ICANON is also set, the ERASE character erases the preceding
226              input character, and WERASE erases the preceding word.
227
228       ECHOK  If ICANON is also set, the KILL  character  erases  the  current
229              line.
230
231       ECHONL If ICANON is also set, echo the NL character even if ECHO is not
232              set.
233
234       ECHOCTL
235              (not in POSIX) If ECHO is also set, terminal special  characters
236              other than TAB, NL, START, and STOP are echoed as ^X, where X is
237              the character with ASCII code  0x40  greater  than  the  special
238              character.   For  example,  character 0x08 (BS) is echoed as ^H.
239              [requires _BSD_SOURCE or _SVID_SOURCE]
240
241       ECHOPRT
242              (not in POSIX) If ICANON and ECHO are also set,  characters  are
243              printed  as  they  are  being  erased.  [requires _BSD_SOURCE or
244              _SVID_SOURCE]
245
246       ECHOKE (not in POSIX) If ICANON is also set, KILL is echoed by  erasing
247              each  character  on the line, as specified by ECHOE and ECHOPRT.
248              [requires _BSD_SOURCE or _SVID_SOURCE]
249
250       DEFECHO
251              (not in POSIX) Echo only when a process is reading.  (Not imple‐
252              mented on Linux.)
253
254       FLUSHO (not  in  POSIX;  not  supported  under  Linux)  Output is being
255              flushed.  This flag is toggled by typing the DISCARD  character.
256              [requires _BSD_SOURCE or _SVID_SOURCE]
257
258       NOFLSH Disable  flushing  the  input  and output queues when generating
259              signals for the INT, QUIT, and SUSP characters.
260
261       TOSTOP Send the SIGTTOU signal to the process  group  of  a  background
262              process which tries to write to its controlling terminal.
263
264       PENDIN (not  in POSIX; not supported under Linux) All characters in the
265              input queue are reprinted  when  the  next  character  is  read.
266              (bash(1)  handles typeahead this way.)  [requires _BSD_SOURCE or
267              _SVID_SOURCE]
268
269       IEXTEN Enable implementation-defined input processing.  This  flag,  as
270              well  as ICANON must be enabled for the special characters EOL2,
271              LNEXT, REPRINT, WERASE to be interpreted, and for the IUCLC flag
272              to be effective.
273
274       The  c_cc  array defines the terminal special characters.  The symbolic
275       indices (initial values) and meaning are:
276
277       VDISCARD
278              (not in POSIX; not supported under Linux; 017, SI, Ctrl-O)  Tog‐
279              gle: start/stop discarding pending output.  Recognized when IEX‐
280              TEN is set, and then not passed as input.
281
282       VDSUSP (not in POSIX; not  supported  under  Linux;  031,  EM,  Ctrl-Y)
283              Delayed  suspend character (DSUSP): send SIGTSTP signal when the
284              character is read by the user program.  Recognized  when  IEXTEN
285              and  ISIG are set, and the system supports job control, and then
286              not passed as input.
287
288       VEOF   (004, EOT, Ctrl-D) End-of-file character (EOF).  More precisely:
289              this  character  causes the pending tty buffer to be sent to the
290              waiting user program without waiting for end-of-line.  If it  is
291              the first character of the line, the read(2) in the user program
292              returns 0, which signifies end-of-file.  Recognized when  ICANON
293              is set, and then not passed as input.
294
295       VEOL   (0,  NUL)  Additional  end-of-line  character (EOL).  Recognized
296              when ICANON is set.
297
298       VEOL2  (not in POSIX; 0, NUL) Yet another end-of-line character (EOL2).
299              Recognized when ICANON is set.
300
301       VERASE (0177, DEL, rubout, or 010, BS, Ctrl-H, or also #) Erase charac‐
302              ter (ERASE).  This erases the previous not-yet-erased character,
303              but  does  not  erase past EOF or beginning-of-line.  Recognized
304              when ICANON is set, and then not passed as input.
305
306       VINTR  (003, ETX, Ctrl-C, or also 0177, DEL, rubout) Interrupt  charac‐
307              ter (INTR).  Send a SIGINT signal.  Recognized when ISIG is set,
308              and then not passed as input.
309
310       VKILL  (025, NAK, Ctrl-U, or Ctrl-X, or also @) Kill character  (KILL).
311              This  erases  the input since the last EOF or beginning-of-line.
312              Recognized when ICANON is set, and then not passed as input.
313
314       VLNEXT (not in POSIX; 026, SYN, Ctrl-V) Literal next  (LNEXT).   Quotes
315              the  next  input  character,  depriving it of a possible special
316              meaning.  Recognized when IEXTEN is set, and then not passed  as
317              input.
318
319       VMIN   Minimum number of characters for noncanonical read (MIN).
320
321       VQUIT  (034,  FS,  Ctrl-\) Quit character (QUIT).  Send SIGQUIT signal.
322              Recognized when ISIG is set, and then not passed as input.
323
324       VREPRINT
325              (not in POSIX; 022, DC2, Ctrl-R) Reprint unread characters  (RE‐
326              PRINT).  Recognized when ICANON and IEXTEN are set, and then not
327              passed as input.
328
329       VSTART (021, DC1, Ctrl-Q) Start  character  (START).   Restarts  output
330              stopped by the Stop character.  Recognized when IXON is set, and
331              then not passed as input.
332
333       VSTATUS
334              (not in POSIX; not supported under Linux; status  request:  024,
335              DC4, Ctrl-T).  Status character (STATUS).  Display status infor‐
336              mation at terminal, including state of  foreground  process  and
337              amount of CPU time it has consumed.  Also sends a SIGINFO signal
338              (not supported on Linux) to the foreground process group.
339
340       VSTOP  (023, DC3, Ctrl-S) Stop character  (STOP).   Stop  output  until
341              Start  character  typed.   Recognized when IXON is set, and then
342              not passed as input.
343
344       VSUSP  (032, SUB, Ctrl-Z) Suspend character (SUSP).  Send SIGTSTP  sig‐
345              nal.  Recognized when ISIG is set, and then not passed as input.
346
347       VSWTCH (not in POSIX; not supported under Linux; 0, NUL) Switch charac‐
348              ter (SWTCH).  Used in System V to switch shells in shell layers,
349              a predecessor to shell job control.
350
351       VTIME  Timeout in deciseconds for noncanonical read (TIME).
352
353       VWERASE
354              (not  in  POSIX;  027, ETB, Ctrl-W) Word erase (WERASE).  Recog‐
355              nized when ICANON and IEXTEN are set, and  then  not  passed  as
356              input.
357
358       An individual terminal special character can be disabled by setting the
359       value of the corresponding c_cc element to _POSIX_VDISABLE.
360
361       The above symbolic subscript values  are  all  different,  except  that
362       VTIME,  VMIN  may  have the same value as VEOL, VEOF, respectively.  In
363       noncanonical mode the special character  meaning  is  replaced  by  the
364       timeout  meaning.   For  an  explanation  of  VMIN  and  VTIME, see the
365       description of noncanonical mode below.
366
367   Retrieving and changing terminal settings
368       tcgetattr() gets the parameters associated with the object referred  by
369       fd  and  stores  them in the termios structure referenced by termios_p.
370       This function may be invoked from a background  process;  however,  the
371       terminal  attributes  may  be  subsequently  changed  by  a  foreground
372       process.
373
374       tcsetattr() sets the parameters associated with  the  terminal  (unless
375       support is required from the underlying hardware that is not available)
376       from the termios structure referred to by termios_p.   optional_actions
377       specifies when the changes take effect:
378
379       TCSANOW
380              the change occurs immediately.
381
382       TCSADRAIN
383              the change occurs after all output written to fd has been trans‐
384              mitted.  This function should be used when  changing  parameters
385              that affect output.
386
387       TCSAFLUSH
388              the  change  occurs  after  all  output  written  to  the object
389              referred by fd has been transmitted, and all input that has been
390              received  but  not  read  will be discarded before the change is
391              made.
392
393   Canonical and noncanonical mode
394       The setting of the ICANON canon flag in c_lflag determines whether  the
395       terminal  is  operating  in canonical mode (ICANON set) or noncanonical
396       mode (ICANON unset).  By default, ICANON set.
397
398       In canonical mode:
399
400       * Input is made available line by line.  An  input  line  is  available
401         when  one  of  the line delimiters is typed (NL, EOL, EOL2; or EOF at
402         the start of line).  Except in the case of EOF, the line delimiter is
403         included in the buffer returned by read(2).
404
405       * Line  editing is enabled (ERASE, KILL; and if the IEXTEN flag is set:
406         WERASE, REPRINT, LNEXT).  A read(2)  returns  at  most  one  line  of
407         input; if the read(2) requested fewer bytes than are available in the
408         current line of input, then only as many bytes as requested are read,
409         and the remaining characters will be available for a future read(2).
410
411       In  noncanonical  mode input is available immediately (without the user
412       having to type a line-delimiter character), no input processing is per‐
413       formed, and line editing is disabled.  The settings of MIN (c_cc[VMIN])
414       and TIME (c_cc[VTIME]) determine the circumstances in which  a  read(2)
415       completes; there are four distinct cases:
416
417       * MIN  ==  0;  TIME == 0: If data is available, read(2) returns immedi‐
418         ately, with the lesser of the number of bytes available, or the  num‐
419         ber of bytes requested.  If no data is available, read(2) returns 0.
420
421       * MIN  >  0; TIME == 0: read(2) blocks until the lesser of MIN bytes or
422         the number of bytes requested are available, and returns  the  lesser
423         of these two values.
424
425       * MIN == 0; TIME > 0: TIME specifies the limit for a timer in tenths of
426         a second.  The timer is started  when  read(2)  is  called.   read(2)
427         returns  either  when at least one byte of data is available, or when
428         the timer expires.  If the timer expires without any  input  becoming
429         available, read(2) returns 0.
430
431       * MIN  > 0; TIME > 0: TIME specifies the limit for a timer in tenths of
432         a second.  Once an initial byte of input becomes available, the timer
433         is  restarted  after  each further byte is received.  read(2) returns
434         either when the lesser of the number of bytes requested or  MIN  byte
435         have  been read, or when the inter-byte timeout expires.  Because the
436         timer is started only after the initial byte  becomes  available,  at
437         least one byte will be read.
438
439   Raw mode
440       cfmakeraw()  sets  the terminal to something like the "raw" mode of the
441       old Version 7 terminal driver: input is available character by  charac‐
442       ter,  echoing is disabled, and all special processing of terminal input
443       and output characters is disabled.  The terminal attributes are set  as
444       follows:
445
446           termios_p->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
447                           | INLCR | IGNCR | ICRNL | IXON);
448           termios_p->c_oflag &= ~OPOST;
449           termios_p->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
450           termios_p->c_cflag &= ~(CSIZE | PARENB);
451           termios_p->c_cflag |= CS8;
452
453   Line control
454       tcsendbreak()  transmits  a continuous stream of zero-valued bits for a
455       specific duration, if the terminal is using  asynchronous  serial  data
456       transmission.   If  duration is zero, it transmits zero-valued bits for
457       at least 0.25 seconds, and not more that 0.5 seconds.  If  duration  is
458       not  zero,  it  sends  zero-valued bits for some implementation-defined
459       length of time.
460
461       If the terminal is not using  asynchronous  serial  data  transmission,
462       tcsendbreak() returns without taking any action.
463
464       tcdrain()  waits  until all output written to the object referred to by
465       fd has been transmitted.
466
467       tcflush() discards data written to the object referred to by fd but not
468       transmitted,  or  data received but not read, depending on the value of
469       queue_selector:
470
471       TCIFLUSH
472              flushes data received but not read.
473
474       TCOFLUSH
475              flushes data written but not transmitted.
476
477       TCIOFLUSH
478              flushes both data received but not read, and  data  written  but
479              not transmitted.
480
481       tcflow()  suspends  transmission  or  reception  of  data on the object
482       referred to by fd, depending on the value of action:
483
484       TCOOFF suspends output.
485
486       TCOON  restarts suspended output.
487
488       TCIOFF transmits a STOP character, which stops the terminal device from
489              transmitting data to the system.
490
491       TCION  transmits  a  START  character, which starts the terminal device
492              transmitting data to the system.
493
494       The default on open of a terminal file is that neither  its  input  nor
495       its output is suspended.
496
497   Line speed
498       The baud rate functions are provided for getting and setting the values
499       of the input and output baud rates in the termios structure.   The  new
500       values do not take effect until tcsetattr() is successfully called.
501
502       Setting  the  speed to B0 instructs the modem to "hang up".  The actual
503       bit rate corresponding to B38400 may be altered with setserial(8).
504
505       The input and output baud rates are stored in the termios structure.
506
507       cfgetospeed() returns the output baud rate stored in the termios struc‐
508       ture pointed to by termios_p.
509
510       cfsetospeed() sets the output baud rate stored in the termios structure
511       pointed to by termios_p to speed, which must be one of these constants:
512
513            B0
514            B50
515            B75
516            B110
517            B134
518            B150
519            B200
520            B300
521            B600
522            B1200
523            B1800
524            B2400
525            B4800
526            B9600
527            B19200
528            B38400
529            B57600
530            B115200
531            B230400
532
533       The zero baud rate, B0, is used to terminate the connection.  If B0  is
534       specified,  the  modem control lines shall no longer be asserted.  Nor‐
535       mally, this will disconnect the line.  CBAUDEX is a mask for the speeds
536       beyond  those  defined  in  POSIX.1  (57600 and above).  Thus, B57600 &
537       CBAUDEX is nonzero.
538
539       cfgetispeed() returns the input baud rate stored in the termios  struc‐
540       ture.
541
542       cfsetispeed()  sets the input baud rate stored in the termios structure
543       to speed, which must be specified as one of the Bnnn  constants  listed
544       above  for  cfsetospeed().   If the input baud rate is set to zero, the
545       input baud rate will be equal to the output baud rate.
546
547       cfsetspeed() is a 4.4BSD extension.  It takes  the  same  arguments  as
548       cfsetispeed(), and sets both input and output speed.
549

RETURN VALUE

551       cfgetispeed()  returns the input baud rate stored in the termios struc‐
552       ture.
553
554       cfgetospeed() returns the output baud rate stored in the termios struc‐
555       ture.
556
557       All other functions return:
558
559       0      on success.
560
561       -1     on failure and set errno to indicate the error.
562
563       Note  that  tcsetattr() returns success if any of the requested changes
564       could be successfully carried out.   Therefore,  when  making  multiple
565       changes  it may be necessary to follow this call with a further call to
566       tcgetattr() to check that all changes have been performed successfully.
567

CONFORMING TO

569       tcgetattr(),   tcsetattr(),   tcsendbreak(),   tcdrain(),    tcflush(),
570       tcflow(),   cfgetispeed(),   cfgetospeed(),  cfsetispeed(),  and  cfse‐
571       tospeed() are specified in POSIX.1-2001.
572
573       cfmakeraw() and cfsetspeed() are  nonstandard,  but  available  on  the
574       BSDs.
575

NOTES

577       UNIX V7 and several later systems have a list of baud rates where after
578       the fourteen values B0, ..., B9600 one finds the  two  constants  EXTA,
579       EXTB  ("External  A"  and  "External B").  Many systems extend the list
580       with much higher baud rates.
581
582       The effect of a nonzero  duration  with  tcsendbreak()  varies.   SunOS
583       specifies  a  break  of duration * N seconds, where N is at least 0.25,
584       and not more than 0.5.  Linux, AIX, DU, Tru64 send a break of  duration
585       milliseconds.   FreeBSD and NetBSD and HP-UX and MacOS ignore the value
586       of duration.  Under Solaris and UnixWare,  tcsendbreak()  with  nonzero
587       duration behaves like tcdrain().
588

SEE ALSO

590       stty(1), console_ioctl(4), tty_ioctl(4), setserial(8)
591

COLOPHON

593       This  page  is  part of release 3.53 of the Linux man-pages project.  A
594       description of the project, and information about reporting  bugs,  can
595       be found at http://www.kernel.org/doc/man-pages/.
596
597
598
599Linux                             2013-03-15                        TERMIOS(3)
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