| TCSETATTR(3) | Library Functions Manual | TCSETATTR(3) | 
cfgetispeed, cfsetispeed,
  cfgetospeed, cfsetospeed,
  cfsetspeed, cfmakeraw,
  tcgetattr, tcsetattr —
#include <termios.h>
speed_t
  
  cfgetispeed(const
    struct termios *t);
int
  
  cfsetispeed(struct
    termios *t, speed_t
    speed);
speed_t
  
  cfgetospeed(const
    struct termios *t);
int
  
  cfsetospeed(struct
    termios *t, speed_t
    speed);
int
  
  cfsetspeed(struct
    termios *t, speed_t
    speed);
void
  
  cfmakeraw(struct
    termios *t);
int
  
  tcgetattr(int
    fd, struct termios
    *t);
int
  
  tcsetattr(int
    fd, int action,
    const struct termios
  *t);
cfmakeraw, tcgetattr and
  tcsetattr functions are provided for getting and
  setting the termios structure.
The cfgetispeed,
    cfsetispeed, cfgetospeed,
    cfsetospeed and cfsetspeed
    functions are provided for getting and setting the baud rate values in the
    termios structure. The effects of the functions on the terminal as described
    below do not become effective, nor are all errors detected, until the
    tcsetattr function is called. Certain values for
    baud rates set in the termios structure and passed to
    tcsetattr have special meanings. These are discussed
    in the portion of the manual page that describes the
    tcsetattr function.
speed_t is typdef'd in the include file
  <termios.h>. The value of the
  integer corresponds directly to the baud rate being represented, however, the
  following symbolic values are defined.
#define B0 0 #define B50 50 #define B75 75 #define B110 110 #define B134 134 #define B150 150 #define B200 200 #define B300 300 #define B600 600 #define B1200 1200 #define B1800 1800 #define B2400 2400 #define B4800 4800 #define B9600 9600 #define B19200 19200 #define B38400 38400 #ifndef _POSIX_SOURCE #define EXTA 19200 #define EXTB 38400 #endif /*_POSIX_SOURCE */
The cfgetispeed function returns the input
    baud rate in the termios structure referenced by
  tp.
The cfsetispeed function sets the input
    baud rate in the termios structure referenced by tp to
    speed.
The cfgetospeed function returns the
    output baud rate in the termios structure referenced by
    tp.
The cfsetospeed function sets the output
    baud rate in the termios structure referenced by tp to
    speed.
The cfsetspeed function sets both the
    input and output baud rate in the termios structure referenced by
    tp to speed.
Upon successful completion, the functions
    cfsetispeed, cfsetospeed,
    and cfsetspeed return a value of 0. Otherwise, a
    value of -1 is returned and the global variable errno
    is set to indicate the error.
In all the functions, although fd is an open file descriptor, the functions affect the underlying terminal file, not just the open file description associated with the particular file descriptor.
The cfmakeraw function sets the flags
    stored in the termios structure (initialized by
    tcgetattr) to a state disabling all input and output
    processing, giving a “raw I/O path”. It should be noted that
    there is no function to reverse this effect. This is because there are a
    variety of processing options that could be re-enabled and the correct
    method is for an application to snapshot the current terminal state using
    the function tcgetattr, setting raw mode with
    cfmakeraw and the subsequent
    tcsetattr, and then using another
    tcsetattr with the saved state to revert to the
    previous terminal state.
The tcgetattr function copies the
    parameters associated with the terminal referenced by
    fd to the termios structure referenced by
    tp. This function is allowed from a background
    process, however, the terminal attributes may be subsequently changed by a
    foreground process.
The tcsetattr function sets the parameters
    associated with the terminal from the termios structure referenced by
    tp. The action field is created
    by or'ing the following values, as specified in the
    include file
  <termios.h>.
The 0 baud rate is used to terminate the connection. If 0 is
    specified as the output speed to the function
    tcsetattr, modem control will no longer be asserted
    on the terminal, disconnecting the terminal.
If zero is specified as the input speed to the function
    tcsetattr, the input baud rate will be set to the
    same value as that specified by the output baud rate.
tcsetattr is unable to make any of the requested
  changes, it returns -1 and sets errno. Otherwise, it makes all of the
  requested changes it can. If the specified input and output baud rates differ
  and are a combination that is not supported, neither baud rate is changed.
Upon successful completion, the functions
    tcgetattr and tcsetattr
    return a value of 0. Otherwise, they return -1 and the global variable
    errno is set to indicate the error, as follows:
EBADF]tcgetattr
      or tcsetattr was not a valid file descriptor.EINTR]tcsetattr function was interrupted by a
      signal.EINVAL]tcsetattr function was not valid, or an attempt
      was made to change an attribute represented in the termios structure to an
      unsupported value.ENOTTY]tcgetattr or tcsetattr is
      not a terminal.cfgetispeed, cfsetispeed,
  cfgetospeed, cfsetospeed,
  tcgetattr and tcsetattr
  functions are expected to be compliant with the IEEE Std
  1003.1-1988 (“POSIX.1”) specification. The
  cfmakeraw and cfsetspeed
  functions, as well as the TCSASOFT option to the
  tcsetattr function are extensions to the
  IEEE Std 1003.1-1988 (“POSIX.1”)
  specification.
| May 1, 2004 | NetBSD 10.0 |