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term.[ch]: Added term_get_mctl() function

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Returns the status of modem-control lines (DTR, DSR, DCD, etc...).
This commit is contained in:
Nick Patavalis
2015-08-25 16:19:26 +03:00
parent 4f409a28e8
commit 3f627d5cff
2 changed files with 67 additions and 0 deletions
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40
term.c
View File

@ -80,6 +80,7 @@ static const char * const term_err_str[] = {
[TERM_EFLOW] = "Invalid flowcontrol mode",
[TERM_EDTRDOWN] = "Cannot lower DTR",
[TERM_EDTRUP] = "Cannot raise DTR",
[TERM_EMCTL] = "Cannot get mctl status",
[TERM_EDRAIN] = "Cannot drain the device",
[TERM_EBREAK] = "Cannot send break sequence"
};
@ -117,6 +118,7 @@ term_strerror (int terrnum, int errnum)
case TERM_EFLOW:
case TERM_EDTRDOWN:
case TERM_EDTRUP:
case TERM_EMCTL:
snprintf(term_err_buff, sizeof(term_err_buff),
"%s", term_err_str[terrnum]);
rval = term_err_buff;
@ -1419,6 +1421,44 @@ term_lower_dtr(int fd)
/***************************************************************************/
int
term_get_mctl (int fd)
{
int mctl, i;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
mctl = -1;
break;
}
#ifdef __linux__
{
int r, pmctl;
r = ioctl(fd, TIOCMGET, &pmctl);
if (r < 0) {
mctl = -1;
break;
}
mctl = 0;
if (pmctl & TIOCM_DTR) mctl |= MCTL_DTR;
if (pmctl & TIOCM_DSR) mctl |= MCTL_DSR;
if (pmctl & TIOCM_CD) mctl |= MCTL_DCD;
if (pmctl & TIOCM_RTS) mctl |= MCTL_RTS;
if (pmctl & TIOCM_CTS) mctl |= MCTL_CTS;
if (pmctl & TIOCM_RI) mctl |= MCTL_RI;
}
#else
mctl = MCTL_UNAVAIL;
#endif
} while(0);
return mctl;
}
int
term_drain(int fd)
{

27
term.h
View File

@ -60,6 +60,7 @@
* F term_pulse_dtr - pulse the DTR line a device
* F term_lower_dtr - lower the DTR line of a device
* F term_raise_dtr - raise the DTR line of a device
* F term_get_mctl - Get modem control signals status
* F term_drain - drain the output from the terminal buffer
* F term_flush - discard terminal input and output queue contents
* F term_break - generate a break condition on a device
@ -139,6 +140,7 @@ enum term_errno_e {
TERM_EFLOW,
TERM_EDTRDOWN,
TERM_EDTRUP,
TERM_EMCTL,
TERM_EDRAIN, /* see errno */
TERM_EBREAK
};
@ -178,6 +180,20 @@ enum flowcntrl_e {
FC_OTHER
};
/*
* C MCTL_xxx
*
* Modem control line bits. Used against the return value of
* term_get_mctl().
*/
#define MCTL_DTR (1<<1) /* O: Data Terminal Ready */
#define MCTL_DSR (1<<2) /* I: Data Set Ready */
#define MCTL_DCD (1<<3) /* I: Data Carrier Detect */
#define MCTL_RTS (1<<4) /* O: Request To Send */
#define MCTL_CTS (1<<5) /* I: Clear To Send */
#define MCTL_RI (1<<6) /* I: Ring Indicator */
#define MCTL_UNAVAIL (1<<0) /* MCTL lines (status) not available */
/***************************************************************************/
/*
@ -589,6 +605,17 @@ int term_lower_dtr (int fd);
*/
int term_raise_dtr (int fd);
/* F term_get_mctl
*
* Get the status of the modem control lines of the serial port
* (terminal) associated with the managed filedes "fd".
*
* On error (fd is not managed) return a negative. If the feature is
* not available returns MCTL_UNAVAIL. Otherwise returns a word that
* can be checked against the MCTL_* flags.
*/
int term_get_mctl (int fd);
/* F term_drain
*
* Drains (flushes) the output queue of the device associated with the