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32 .\" @(#)tcsetattr.3 8.3 (Berkeley) 1/2/94
33 .\" $FreeBSD: src/lib/libc/gen/tcsetattr.3,v 1.6.2.4 2002/12/29 16:35:34 schweikh Exp $
34 .\" $DragonFly: src/lib/libc/gen/tcsetattr.3,v 1.2 2003/06/17 04:26:42 dillon Exp $
48 .Nd manipulating the termios structure
54 .Fn cfgetispeed "const struct termios *t"
56 .Fn cfsetispeed "struct termios *t" "speed_t speed"
58 .Fn cfgetospeed "const struct termios *t"
60 .Fn cfsetospeed "struct termios *t" "speed_t speed"
62 .Fn cfsetspeed "struct termios *t" "speed_t speed"
64 .Fn cfmakeraw "struct termios *t"
66 .Fn tcgetattr "int fd" "struct termios *t"
68 .Fn tcsetattr "int fd" "int action" "const struct termios *t"
75 functions are provided for getting and setting the termios structure.
84 functions are provided for getting and setting the baud rate values in
85 the termios structure.
86 The effects of the functions on the terminal as described below
87 do not become effective, nor are all errors detected, until the
90 Certain values for baud rates set in the termios structure and passed to
92 have special meanings.
93 These are discussed in the portion of the manual page that describes the
96 .Sh GETTING AND SETTING THE BAUD RATE
97 The input and output baud rates are found in the termios structure.
100 is typedef'd in the include file
102 The value of the integer corresponds directly to the baud rate being
103 represented, however, the following symbolic values are defined.
121 #ifndef _POSIX_SOURCE
124 #endif /*_POSIX_SOURCE */
129 function returns the input baud rate in the termios structure referenced by
134 function sets the input baud rate in the termios structure referenced by
141 function returns the output baud rate in the termios structure referenced by
146 function sets the output baud rate in the termios structure referenced by
153 function sets both the input and output baud rate in the termios structure
159 Upon successful completion, the functions
165 Otherwise, a value of -1 is returned and the global variable
167 is set to indicate the error.
168 .Sh GETTING AND SETTING THE TERMIOS STATE
169 This section describes the functions that are used to control the general
171 Unless otherwise noted for a specific command, these functions are restricted
172 from use by background processes.
173 Attempts to perform these operations shall cause the process group to be sent
175 If the calling process is blocking or ignoring SIGTTOU signals, the process
176 is allowed to perform the operation and the SIGTTOU signal is not sent.
178 In all the functions, although
180 is an open file descriptor, the functions affect the underlying terminal
181 file, not just the open file description associated with the particular
186 function sets the flags stored in the termios structure to a state disabling
187 all input and output processing, giving a
189 It should be noted that there is no function to reverse this effect.
190 This is because there are a variety of processing options that could be
191 re-enabled and the correct method is for an application to snapshot the
192 current terminal state using the function
194 setting raw mode with
198 and then using another
200 with the saved state to revert to the previous terminal state.
204 function copies the parameters associated with the terminal referenced
207 in the termios structure referenced by
209 This function is allowed from a background process, however, the terminal
210 attributes may be subsequently changed by a foreground process.
214 function sets the parameters associated with the terminal from the
215 termios structure referenced by
221 the following values, as specified in the include file
223 .Bl -tag -width "TCSADRAIN"
225 The change occurs immediately.
227 The change occurs after all output written to
229 has been transmitted to the terminal.
232 should be used when changing parameters that affect output.
234 The change occurs after all output written to
236 has been transmitted to the terminal.
237 Additionally, any input that has been received but not read is discarded.
243 value, the values of the
251 The 0 baud rate is used to terminate the connection.
252 If 0 is specified as the output speed to the function
254 modem control will no longer be asserted on the terminal, disconnecting
257 If zero is specified as the input speed to the function
259 the input baud rate will be set to the same value as that specified by
260 the output baud rate.
264 is unable to make any of the requested changes, it returns -1 and
266 Otherwise, it makes all of the requested changes it can.
267 If the specified input and output baud rates differ and are a combination
268 that is not supported, neither baud rate is changed.
270 Upon successful completion, the functions
276 return -1 and the global variable
278 is set to indicate the error, as follows:
287 was not a valid file descriptor.
291 function was interrupted by a signal.
297 function was not valid, or an attempt was made to change an attribute
298 represented in the termios structure to an unsupported value.
300 The file associated with the
320 functions are expected to be compliant with the
332 function are extensions to the