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/*
* Copyright (c) 1997 Adrian Sun (asun@zoology.washington.edu)
* All rights reserved. See COPYRIGHT.
*
* Copyright (c) 1990,1993 Regents of The University of Michigan.
* All Rights Reserved. See COPYRIGHT.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/time.h>
#include <atalk/compat.h>
#include <atalk/util.h>
static struct itimerval itimer;
/* this creates an open lock file which hangs around until the program
* dies. it returns the pid. due to problems w/ solaris, this has
* been changed to do the kill() thing. */
pid_t server_lock(char *program, char *pidfile, int debug)
{
char buf[10];
FILE *pf;
pid_t pid;
int mask;
mask = umask(022);
/* check for pid. this can get fooled by stale pid's. */
if ((pf = fopen(pidfile, "r"))) {
if (fgets(buf, sizeof(buf), pf) && !kill(pid = atol(buf), 0)) {
fprintf( stderr, "%s is already running (pid = %d), or the lock file is stale.\n",
program, pid);
fclose(pf);
return -1;
}
fclose(pf);
}
if ((pf = fopen(pidfile, "w")) == NULL) {
fprintf(stderr, "%s: can't open lock file, \"%s\"\n", program,
pidfile);
return -1;
}
umask(mask);
/*
* Disassociate from controlling tty.
*/
if ( !debug ) {
int i;
getitimer(ITIMER_PROF, &itimer);
switch (pid = fork()) {
case 0 :
setitimer(ITIMER_PROF, &itimer, NULL);
fclose(stdin);
fclose(stdout);
fclose(stderr);
i = open( "/dev/null", O_RDWR );
i = open( "/dev/null", O_RDWR );
i = open( "/dev/null", O_RDWR );
#ifdef TIOCNOTTY
if (( i = open( "/dev/tty", O_RDWR )) >= 0 ) {
(void)ioctl( i, TIOCNOTTY, 0 );
setpgid( 0, getpid());
(void) close(i);
}
#else
setpgid( 0, getpid());
#endif
break;
case -1 : /* error */
perror( "fork" );
default : /* server */
fclose(pf);
return pid;
}
}
fprintf(pf, "%d\n", getpid());
fclose(pf);
return 0;
}
/*!
* Check lockfile
*/
int check_lockfile(const char *program, const char *pidfile)
{
char buf[10];
FILE *pf;
pid_t pid;
/* check for pid. this can get fooled by stale pid's. */
if ((pf = fopen(pidfile, "r"))) {
if (fgets(buf, sizeof(buf), pf) && !kill(pid = atol(buf), 0)) {
fprintf(stderr, "%s is already running (pid = %d), or the lock file is stale.\n",
program, pid);
fclose(pf);
return -1;
}
fclose(pf);
}
return 0;
}
/*!
* Check and create lockfile
*/
int create_lockfile(const char *program, const char *pidfile)
{
char buf[10];
FILE *pf;
pid_t pid;
int mask;
if (check_lockfile(program, pidfile) != 0)
return -1;
/* Write PID to pidfile */
mask = umask(022);
if ((pf = fopen(pidfile, "w")) == NULL) {
fprintf(stderr, "%s: can't open lock file, \"%s\"\n", program,
pidfile);
return -1;
}
umask(mask);
fprintf(pf, "%d\n", getpid());
fclose(pf);
return 0;
}
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