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/*
* Copyright 1988 by Rayan S. Zachariassen, all rights reserved.
* This will be free software, but only when it is finished.
*/
#include "hostenv.h"
#include "mailer.h"
#include "zmsignal.h" /* used for kill(2) */
#include "libz.h"
#include "libc.h"
#ifndef _IOFBF
#define _IOFBF 0
#endif /* !_IOFBF */
/* send a signal to an already-running daemon process or process group */
int
killprevious(sig, pidfile)
int sig;
const char *pidfile;
{
int c, rc;
FILE *fp;
char *path, buf[128];
path = emalloc((unsigned)(strlen(postoffice) + strlen(pidfile) + 2));
sprintf(path, "%s/%s", postoffice, pidfile);
if (sig != 0 && (fp = fopen(path, "r")) != NULL) {
setvbuf(fp, buf, _IOFBF, sizeof buf);
if (fscanf(fp, "%d", &c) != 1)
fprintf(stderr,
"couln't make sense of contents of %s!\n",
path);
else if (c == getpid())
printf("was about to commit suicide\n");
else if ((sig < 0 && kill(-c, -sig) == 0 && sig == -SIGTERM)
|| (sig > 0 && kill(c, sig) == 0 && sig == SIGTERM)) {
printf("killed previous daemon%s = %d\n",
(sig > 0) ? ", pid" : "s, pgrp", c);
sleep(5); /* Give process time to die */
}
fclose(fp);
}
rc = 0;
if ((sig == 0 || sig == SIGTERM || -sig == SIGTERM)
&& (fp = fopen(path, "w+")) != NULL) {
setvbuf(fp, buf, _IOFBF, sizeof buf);
fprintf(fp, "%d\n", (int)getpid());
rc = fflush(fp);
if (fclose(fp) != 0)
rc |= 1; /* indicate error */
if (rc != 0)
unlink(path);
}
free(path);
return rc;
}
int
killpidfile(pidfile)
const char *pidfile;
{
int rc;
char *path;
path = emalloc((unsigned)(strlen(postoffice) + strlen(pidfile) + 2));
sprintf(path, "%s/%s", postoffice, pidfile);
rc = unlink(path);
free(path);
return rc;
}
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