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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2011 New Dream Network
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#if defined(__FreeBSD__)
#include <sys/param.h>
#endif
#include "include/compat.h"
#include "common/errno.h"
#include "common/safe_io.h"
#include "global/debug.h"
#include "pidfile.h"
#define dout_prefix *_dout
static char pid_file[PATH_MAX] = "";
int pidfile_write(const md_config_t *conf)
{
int ret, fd;
if (conf->pid_file.empty()) {
return pidfile_remove();
}
snprintf(pid_file, PATH_MAX, "%s", conf->pid_file.c_str());
fd = TEMP_FAILURE_RETRY(::open(pid_file,
O_CREAT|O_TRUNC|O_WRONLY, 0644));
if (fd < 0) {
int err = errno;
derr << "write_pid_file: failed to open pid file '"
<< pid_file << "': " << cpp_strerror(err) << dendl;
return err;
}
char buf[20];
int len = snprintf(buf, sizeof(buf), "%d\n", getpid());
ret = safe_write(fd, buf, len);
if (ret < 0) {
derr << "write_pid_file: failed to write to pid file '"
<< pid_file << "': " << cpp_strerror(ret) << dendl;
TEMP_FAILURE_RETRY(::close(fd));
return ret;
}
if (TEMP_FAILURE_RETRY(::close(fd))) {
ret = errno;
derr << "SimpleMessenger::write_pid_file: failed to close to pid file '"
<< pid_file << "': " << cpp_strerror(ret) << dendl;
return -ret;
}
return 0;
}
int pidfile_remove(void)
{
if (!pid_file[0])
return 0;
// only remove it if it has OUR pid in it!
int fd = TEMP_FAILURE_RETRY(::open(pid_file, O_RDONLY));
if (fd < 0)
return -errno;
char buf[32];
memset(buf, 0, sizeof(buf));
ssize_t res = safe_read(fd, buf, sizeof(buf));
TEMP_FAILURE_RETRY(::close(fd));
if (res < 0)
return res;
int a = atoi(buf);
if (a != getpid())
return -EDOM;
res = ::unlink(pid_file);
if (res)
return res;
pid_file[0] = '\0';
return 0;
}
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