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/* $Id: exec.c,v 1.5 2001/03/13 08:34:15 reinelt Exp $
*
* exec ('x*') functions
*
* Copyright 2001 by Leopold T�tsch (lt@toetsch.at)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: exec.c,v $
* Revision 1.5 2001/03/13 08:34:15 reinelt
*
* corrected a off-by-one bug with sensors
*
* Revision 1.4 2001/03/09 14:24:49 ltoetsch
* exec: Scale_x ->Min/Max_x
*
* Revision 1.3 2001/03/08 15:25:38 ltoetsch
* improved exec
*
* Revision 1.2 2001/03/08 08:39:54 reinelt
*
* fixed two typos
*
* Revision 1.1 2001/03/07 18:10:21 ltoetsch
* added e(x)ec commands
*
*
* This implements the x1 .. x9 commands
* config options:
* x1 .. x9 command to execute
* Tick_x1 ... 9 delay in ticks
* Delay_x1 .. 9 delay in seconds
* Max_x1 .. 9 max for scaling bars (100)
* Min_x1 .. 9 min for scaling bars (0)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <errno.h>
#define IN_EXEC
#include "exec.h"
#include "debug.h"
#include "cfg.h"
int Exec(int index, char buff[EXEC_TXT_LEN], double *val)
{
static time_t now[EXECS+1];
static int errs[EXECS+1];
static int ticks[EXECS+1];
char *command, *p;
char xn[20];
char env[EXEC_TXT_LEN];
FILE *pipe;
size_t len;
int i;
if (index < 0 || index > EXECS)
return -1;
if (errs[index])
return -1;
/* first time ? */
if (now[index] != 0) {
/* delay in Ticks ? */
sprintf(xn, "Tick_x%d", index);
p = cfg_get(xn);
if (p && *p) {
if (ticks[index]++ % atoi(p) != 0)
return 0;
}
else {
sprintf(xn, "Delay_x%d", index);
/* delay in Delay_x* sec ? */
if (time(NULL) <= now[index] + atoi(cfg_get(xn)?:"1"))
return 0;
}
}
time(&now[index]);
*val = -1;
sprintf(xn, "x%d", index);
command = cfg_get(xn);
debug("%s:'%s'",xn,command);
if (!command || !*command) {
error("Empty command for 'x%d'", index);
errs[index]++;
return -1;
}
for (i = 1; i < index; i++) {
sprintf(env, "X%d=%.*s", i, EXEC_TXT_LEN-10, exec[i].s);
putenv(env);
}
putenv("PATH=/usr/local/bin:/usr/bin:/bin");
pipe = popen(command, "r");
if (pipe == NULL) {
error("Couldn't run pipe '%s':\n%s", command, strerror(errno));
errs[index]++;
return -1;
}
len = fread(buff, 1, EXEC_TXT_LEN-1, pipe);
if (len <= 0) {
pclose(pipe);
error("Couldn't fread from pipe '%s', len=%d", command, len);
errs[index]++;
*buff = '\0';
return -1;
}
pclose(pipe);
buff[len] = '\0';
for (p = buff ; *p && isspace(*p); p++)
;
if (isdigit(*p)) {
double max, min;
*val = atof(p);
sprintf(xn, "Max_x%d", index);
max = atof(cfg_get(xn)?:"100")?:100;
sprintf(xn, "Min_x%d", index);
min = atof(cfg_get(xn)?:"0");
if (max != min)
*val = (*val - min)/(max - min);
}
return 0;
}
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