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/* $Revision: 1.4 $ */
/* process.c - PID handling bits for dcd
* (C) 1999 David E. Smith (dave@technopagan.org)
* Released under GNU GPL, see `COPYING' for details.
*/
#include "process.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
/* the above is for PATH_MAX that is supposed to be in unistd but ain't */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <fcntl.h>
#include <signal.h>
#define DIRSIZE ((PATH_MAX) - 8)
#define SPACE ' '
/* something really should be done with these hard-coded numbers */
/* This does a malloc() so be sure to have a matching free() later on. */
static char * fname (void) {
char *home = getenv("HOME");
char *ret = malloc(DIRSIZE);
memset (ret, '\0', sizeof(ret));
snprintf (ret, DIRSIZE, "%s/%s", home, PIDFILE);
return ret;
}
int dcd_getpid (void) {
int pid;
FILE *fd = fopen (fname(), "r");
if (NULL == fd) return 0;
fscanf (fd, "%i", &pid);
#ifdef DEBUG
if (pid == 0)
fprintf (stderr, "dcd_getpid couldn't find an old PID\n");
else
fprintf (stderr, "dcd_getpid found old pid %i\n", pid);
#endif
fclose(fd);
return pid;
}
int dcd_setpid (void) {
int pid = getpid();
FILE *fd = fopen (fname(), "w+");
if (NULL == fd) return -1;
fprintf (fd, "%i\n", pid);
fclose (fd);
#ifdef DEBUG
fprintf (stderr, "dcd_setpid wrote %i\n", pid);
#endif
return pid;
}
int dcd_delpid (void) {
unlink (fname()); /* not worried about errors */
#ifdef DEBUG
fprintf (stderr, "dcd_delpid just went off\n");
#endif
return 0;
}
int dcd_kill (int signal) {
int pid = dcd_getpid();
int k = 0;
#ifdef DEBUG
fprintf (stderr, "dcd_kill: sending signal %i to process %i\n",
signal, pid);
#endif
if (pid != 0) k = kill (pid, signal);
/* kill() is intentionally not error checked. If it fails, it will do
so silently. This is, believe it or not, a good thing. */
return pid;
}
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