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dial(3NSL)	     Networking	Services Library Functions	    dial(3NSL)

NAME
       dial - establish	an outgoing terminal line connection

SYNOPSIS
       cc [ flag ... ] file ...	-lnsl [	library	... ]
       #include	<dial.h>

       int dial(CALL call);

       void undial(int fd);

DESCRIPTION
       dial()	returns	 a  file-descriptor  for  a  terminal  line  open  for
       read/write. The argument	to dial() is a CALL structure (defined in  the
       header <dial.h>).

       When  finished with the terminal	line, the calling program must	invoke
       undial()	to release the semaphore that has been set during the  alloca-
       tion of the terminal device.

       CALL is defined in the header <dial.h> and has the following members:

       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;	/* unused */
       int	     dev_len;	/* unused */

       The CALL	element	speed is intended only for use with an outgoing	dialed
       call, in	which case its value should be the desired  transmission  baud
       rate.  The CALL element baud is no longer used.

       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 should	be set to  -1.
       This value will cause dial to determine the correct value from the <De-
       vices> file.

       The telno element is for	a pointer to a character  string  representing
       the  telephone  number  to  be dialed. Such numbers may consist only of
       these characters:

       0-9			     dial 0-9
       *			     dail  *
       #			     dail  #
       ------------------------------wait for secondary	dial tone
       -			     delay for
       approximately 4 seconds

       The CALL	element	modem is used to  specify  modem  control  for	direct
       lines.  This  element  should be	non-zero if modem control is required.
       The CALL	element	attr is	a pointer to a termio structure, as defined in
       the  header  <termio.h>.	 A  NULL value for this	pointer	element	may be
       passed to the dial function, but	if such	a structure is	included,  the
       elements	specified in it	will be	set for	the outgoing terminal line be-
       fore the	connection is established. This	setting	is often important for
       certain attributes such as parity and baud-rate.

       The  CALL  elements device and dev_len are no longer used. They are re-
       tained in the CALL structure for	compatibility reasons.

RETURN VALUES
       On failure, a negative value indicating the reason for the failure will
       be  returned.  Mnemonics	 for these negative indices as listed here are
       defined in the header <dial.h>.

       INTRPT  -1	 /* interrupt occurred */
       D_HUNG  -2	 /* dialer hung	(no return from	write) */
       NO_ANS  -3	 /* no answer within 10	seconds	*/
       ILL_BD  -4	 /* illegal baud-rate */
       A_PROB  -5	 /* acu	problem	(open()	failure) */
       L_PROB  -6	 /* line problem (open() failure) */
       NO_Ldv  -7	 /* can't open Devices file */
       DV_NT_A -8	 /* requested device not available */
       DV_NT_K -9	 /* requested device not known */
       NO_BD_A -10	 /* no device available	at requested baud */
       NO_BD_K -11	 /* no device known at requested baud */
       DV_NT_E -12	 /* requested speed does not match */
       BAD_SYS -13	 /* system not in Systems file*/

FILES
       /etc/uucp/Devices

       /etc/uucp/Systems

       /var/spool/uucp/LCK..tty-device

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE	TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       uucp(1C), alarm(2), read(2), write(2), attributes(5), termio(7I)

NOTES
       Including  the  header  <dial.h>	 automatically	includes  the	header
       <termio.h>.  An	alarm(2)  system  call	for  3600 seconds is made (and
       caught) within the dial module for  the	purpose	 of  ``touching''  the
       LCK.. file and constitutes the device allocation	semaphore for the ter-
       minal device. Otherwise,	uucp(1C) may simply delete the LCK.. entry  on
       its 90-minute clean-up rounds. The alarm	may go off while the user pro-
       gram is in a read(2) or write(2)	function, causing  an  apparent	 error
       return.	If  the	user program expects to	be around for an hour or more,
       error returns from read()s should be checked  for  (errno==EINTR),  and
       the read() possibly reissued.

       This  interface is unsafe in multithreaded applications.	 Unsafe	inter-
       faces should be called only from	the main thread.

SunOS 5.9			  30 Dec 1996			    dial(3NSL)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | FILES | ATTRIBUTES | SEE ALSO | NOTES

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