mirror of
https://github.com/kingk85/uFTP.git
synced 2025-05-31 04:28:40 +03:00
138 lines
3.7 KiB
C
138 lines
3.7 KiB
C
/*
|
||
* The MIT License
|
||
*
|
||
* Copyright 2018 Ugo Cirmignani.
|
||
*
|
||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
* of this software and associated documentation files (the "Software"), to deal
|
||
* in the Software without restriction, including without limitation the rights
|
||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
* copies of the Software, and to permit persons to whom the Software is
|
||
* furnished to do so, subject to the following conditions:
|
||
*
|
||
* The above copyright notice and this permission notice shall be included in
|
||
* all copies or substantial portions of the Software.
|
||
*
|
||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
* THE SOFTWARE.
|
||
*/
|
||
|
||
|
||
#include <unistd.h>
|
||
#include <stdlib.h>
|
||
#include <fcntl.h>
|
||
#include <syslog.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <stdio.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/resource.h>
|
||
#include <signal.h>
|
||
|
||
|
||
#include "fileManagement.h"
|
||
|
||
#define LOCKFILE "/var/run/uFTP.pid"
|
||
#define LOCKMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
|
||
|
||
int isProcessAlreadyRunning(void)
|
||
{
|
||
int fd;
|
||
int returnCode;
|
||
char buf[30];
|
||
memset(buf, 0,30);
|
||
fd = open(LOCKFILE, O_RDWR|O_CREAT, LOCKMODE);
|
||
if (fd < 0)
|
||
{
|
||
syslog(LOG_ERR, "can’t open %s: %s", LOCKFILE, strerror(errno));
|
||
exit(1);
|
||
}
|
||
//printf("\nFile pid opened.");
|
||
|
||
if ((returnCode = FILE_LockFile(fd)) < 0)
|
||
{
|
||
if (errno == EACCES || errno == EAGAIN)
|
||
{
|
||
close(fd);
|
||
return(1);
|
||
}
|
||
syslog(LOG_ERR, "can’t lock %s: %s", LOCKFILE, strerror(errno));
|
||
exit(1);
|
||
}
|
||
|
||
//printf("\nFILE_LockFile returnCode = %d", returnCode);
|
||
ftruncate(fd, 0);
|
||
returnCode = snprintf(buf, 100, "%ld", (long)getpid());
|
||
returnCode = write(fd, buf, strlen(buf)+1);
|
||
return(0);
|
||
}
|
||
|
||
|
||
void daemonize(const char *cmd)
|
||
{
|
||
int
|
||
i, fd0, fd1, fd2;
|
||
pid_t pid;
|
||
struct rlimit rl;
|
||
struct sigaction sa;
|
||
|
||
/*
|
||
* Clear file creation mask.
|
||
*/
|
||
umask(0);
|
||
|
||
/*
|
||
* Get maximum number of file descriptors.
|
||
*/
|
||
if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
|
||
printf("%s: can’t get file limit", cmd);
|
||
|
||
/*
|
||
* Become a session leader to lose controlling TTY.
|
||
*/
|
||
if ((pid = fork()) < 0)
|
||
printf("%s: can’t fork", cmd);
|
||
else if (pid != 0) /* parent */
|
||
exit(0);
|
||
|
||
setsid();
|
||
|
||
/*
|
||
* Ensure future opens won’t allocate controlling TTYs.
|
||
*/
|
||
sa.sa_handler = SIG_IGN;
|
||
sigemptyset(&sa.sa_mask);
|
||
|
||
sa.sa_flags = 0;
|
||
if (sigaction(SIGHUP, &sa, NULL) < 0)
|
||
printf("%s: can’t ignore SIGHUP", cmd);
|
||
if ((pid = fork()) < 0)
|
||
printf("%s: can’t fork", cmd);
|
||
else if (pid != 0) /* parent */
|
||
exit(0);
|
||
/*
|
||
* Change the current working directory to the root so
|
||
* we won’t prevent file systems from being unmounted.
|
||
*/
|
||
if (chdir("/") < 0)
|
||
printf("%s: can’t change directory to /", cmd);
|
||
/*
|
||
* Close all open file descriptors.
|
||
*/
|
||
if (rl.rlim_max == RLIM_INFINITY)
|
||
rl.rlim_max = 1024;
|
||
for (i = 0; i < rl.rlim_max; i++)
|
||
close(i);
|
||
/*
|
||
* Attach file descriptors 0, 1, and 2 to /dev/null.
|
||
*/
|
||
fd0 = open("/dev/null", O_RDWR);
|
||
fd1 = dup(0);
|
||
fd2 = dup(0);
|
||
}
|