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The
and functions each return a pointer to an object, with the following
structure, containing the broken-out fields of a line from the tty description
file. struct ttyent { char *ty_name; /* terminal device name */
char *ty_getty; /* command to execute */
char *ty_type; /* terminal type */
#define TTY_ON 0x01 /* enable logins */ #define TTY_SECURE 0x02 /* allow uid
of 0 to login */ #define TTY_LOCAL 0x04 /* set ’CLOCAL’ on open (dev. specific)
*/ #define TTY_RTSCTS 0x08 /* set ’CRTSCTS’ on open (dev. specific) */ #define TTY_SOFTCAR 0x10 /*
ignore hardware carrier (dev. spec.) */ #define TTY_MDMBUF 0x20 /* set ’MDMBUF’
on open (dev. specific) */ int ty_status; /* flag values */
char *ty_window; /* command for window manager */
char *ty_comment; /* comment field */
}; The fields are as follows: The name of the character-special file.
The name of the command invoked by to initialize tty line characteristics.
The name of the default terminal type connected to this tty line. A mask
of bit fields which indicate various actions allowed on this tty line. The
possible flags are as follows: Enables logins (i.e., will start the command
referenced by on this entry). Allow users with a uid of 0 to login on
this terminal. If the terminal port’s driver supports it, cause the line
to be treated as ‘‘local.’’ If the terminal port’s driver supports it, use full-duplex
RTS/CTS hardware flow control on the line by default. If the terminal port’s
driver supports it, ignore hardware carrier on the line. The command to
execute for a window system associated with the line. Any trailing comment
field, with any leading hash marks (‘‘#’’) or whitespace removed. If any of
the fields pointing to character strings are unspecified, they are returned
as null pointers. The field will be zero if no flag values are specified.
See for a more complete discussion of the meaning and usage of the fields.
The function reads the next line from the ttys file, opening the file
if necessary. The function rewinds the file if open, or opens the file
if it is unopened. The function closes any open files. The function searches
from the beginning of the file until a matching is found (or until is
encountered).
The routines and return a null pointer on
or error. The function and return 0 on failure and 1 on success.
The and functions appeared in
These functions
use static data storage; if the data is needed for future use, it should
be copied before any subsequent calls overwrite it.
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