HP-UX Reference (11i v3 07/02) - 3 Library Functions A-M (vol 6)

d
dial(3C) dial(3C)
NAME
dial(), undial() - establish an outgoing terminal line connection
SYNOPSIS
#include <dial.h>
int dial(CALL call);
void undial(int fd);
DESCRIPTION
The dial() function returns a file descriptor for a terminal line open for read/write. The argument to
dial() is a CALL structure (defined in the
<dial.h> header file).
When finished with the terminal line, the calling program must invoke
undial() to release the sema-
phore that has been set during the allocation of the terminal device.
The definition of
CALL in the
<dial.h> header file is:
typedef struct {
struct termio *attr; /* pointer to termio attribute struct */
int baud; /* transmission data rate */
int speed; /* 212A modem: low=300, high=1200 */
char *line; /* device name for out-going line */
char *telno; /* pointer to tel-no digits string */
int modem; /* specify modem control for direct lines */
char *device; /* Will hold the name of the device used
to make a connection */
int dev_len; /* The length of the device used to
make connection */
} CALL;
CALL
elements are as follows:
speed Intended only for use with an outgoing dialed call, in which case its value should be either
300 or 1200 to identify the 113A modem, or the high- or low-speed setting on the 212A
modem. Note that the 113A modem or the low-speed setting of the 212A modem transmits
at any rate between 0 and 300 bits per second. However, the high-speed setting of the
212A modem transmits and receives at 1200 bits per second only.
baud Desired transmission baud rate. For example, one might set baud to 110 and speed to 300
(or 1200). However, if speed is set to 1200, baud must be set to high (1200).
line If the desired terminal line is a direct line, a string pointer to its device name should be
placed in the line element in the
CALL structure. Legal values for such terminal device
names are kept in the Devices file. In this case, the value of the baud element need not
be specified as it will be determined from the
Devices file.
telno A pointer to a character string representing the telephone number to be dialed. Such
numbers can consist only of symbols described below. The termination symbol is supplied
by the dial() function, and should not be included in the telno string passed to dial()
in the CALL structure.
Permissible Codes
0-9 Dial 0-9
*
or : Dial *
#
or ; Dial #
-
4-second delay for second dial tone
e or < End of number
w or = Wait for secondary dial tone
f Flash off-hook for 1 second
modem Specifies modem control for direct lines. Set to non-zero if modem control is required.
HP-UX 11i Version 3: February 2007 − 1 − Hewlett-Packard Company 275