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/************************************************************************/
/* File Name : genwrite.c */
/* Program Name : genpowerd Version: 1.0.1 */
/* Author : Brian White <bcwhite@pobox.com> */
/* Created : 1998/01/13 */
/* Last Modified By : Brian White Date: 1998/01/13 */
/* */
/* Compiler (created) : GCC 2.7.3 */
/* Compiler (env) : Linux 2.0.33 */
/* ANSI C Compatable : No */
/* POSIX Compatable : Yes? */
/* */
/* Purpose : Write some characters to the serial port */
/* : with DTR and RTS set as desired. */
/* */
/* Usage : genwrite [-d] [-r] <serial device> <chars> */
/* : i.e. genpowerd /dev/apc-ups "Y" */
/* */
/* History/Credits : Some code was taken from "genpowerd", written */
/* : by Tom Webster. */
/* */
/* Copyright : GNU Copyleft */
/************************************************************************/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
/* Main program. */
int main(int argc, char **argv) {
int rts_set = 0;
int dtr_set = 0;
char* program_name;
int fd;
program_name = argv[0];
/* Parse the command line */
while ((argc > 1) && (argv[1][0] == '-')) {
switch (argv[1][1]) {
case 'r':
rts_set = 1;
break;
case 'd':
dtr_set = 1;
break;
default:
fprintf(stderr, "\nUsage: %s [-d] [-r] <device> <chars>\n", program_name);
exit(1);
}
argv++;
argc--;
}
/* Done with options, make sure that one port is specified */
if (argc != 3) {
fprintf(stderr, "\nUsage: %s [-d] [-r] <device> <chars>\n", program_name);
exit(1);
} /* if (argc != 3) */
/* Open the device */
if ((fd = open(argv[1], O_RDWR | O_NDELAY)) < 0) {
fprintf(stderr, "%s: %s: %s\n",program_name, argv[1], sys_errlist[errno]);
exit(1);
}
/* Line is opened, so DTR and RTS are high. Clear them (can */
/* cause problems with some UPSs if they remain set). */
ioctl(fd, TIOCMBIC, TIOCM_RTS);
ioctl(fd, TIOCMBIC, TIOCM_DTR);
/* Set line(s) if so requested */
if (rts_set) {
ioctl(fd, TIOCMBIS, TIOCM_RTS);
}
if (dtr_set) {
ioctl(fd, TIOCMBIS, TIOCM_DTR);
}
/* Delay a bit so things can equalize (0.1 seconds) */
usleep(100000);
/* Write out the characters */
write(fd,argv[2],strlen(argv[2]));
/* Delay a bit so things can equalize (0.1 seconds) */
usleep(100000);
/* Close the path */
close(fd);
/* Return cleanly */
return 0;
}
/*
* local variables:
* tab-width: 8
* end:
*/
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