1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3 * DataDifferential Utility Library
5 * Copyright (C) 2011 Data Differential, http://datadifferential.com/
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * * Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following disclaimer
17 * in the documentation and/or other materials provided with the
20 * * The names of its contributors may not be used to endorse or
21 * promote products derived from this software without specific prior
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
27 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
28 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
34 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include "util/pidfile.hpp"
50 #include <sys/types.h>
55 char pid_file
[1024 * 4]= { 0 };
57 static void remove_pidfile(void)
61 if (unlink(pid_file
) == -1)
63 std::cerr
<< "Could not remove pidfile: " << pid_file
<< "(" << strerror(errno
) << ")" << std::endl
;
72 namespace datadifferential
{
75 Pidfile::Pidfile(const std::string
&arg
) :
84 if (not _filename
.empty())
86 if (access(_filename
.c_str(), F_OK
) == -1)
88 std::stringstream error_stream
;
89 error_stream
<< "Could not access the pid file: " << _filename
<< "(" << strerror(errno
) << ")";
90 _error_message
= error_stream
.str();
92 else if (unlink(_filename
.c_str()) == -1)
94 std::stringstream error_stream
;
95 error_stream
<< "Could not remove the pid file: " << _filename
<< "(" << strerror(errno
) << ")";
96 _error_message
= error_stream
.str();
102 bool Pidfile::create()
104 if (_filename
.empty())
109 if (access(_filename
.c_str(), F_OK
) == 0)
111 if (unlink(_filename
.c_str()) == -1)
113 std::stringstream error_stream
;
114 error_stream
<< "Unable to remove exisiting file:" << _filename
<< "(" << strerror(errno
) << ")";
115 _error_message
= error_stream
.str();
121 int oflags
= O_CREAT
|O_WRONLY
|O_TRUNC
;
122 #ifdef HAVE_O_CLOEXEC
123 oflags
= oflags
| O_CLOEXEC
;
127 if ((file
= open(_filename
.c_str(), oflags
, S_IRWXU
|S_IRGRP
|S_IROTH
)) < 0)
129 std::stringstream error_stream
;
130 error_stream
<< "Could not open pid file for writing: " << _filename
<< "(" << strerror(errno
) << ")";
131 _error_message
= error_stream
.str();
137 unsigned long temp
= static_cast<unsigned long>(getpid());
138 int length
= snprintf(buffer
, sizeof(buffer
), "%lu\n", temp
);
139 if (write(file
, buffer
, length
) != length
)
141 std::stringstream error_stream
;
142 error_stream
<< "Could not write pid to file: " << _filename
<< "(" << strerror(errno
) << ")";
143 _error_message
= error_stream
.str();
151 _error_message
+= "Could not close() file after writing pid to it: ";
152 _error_message
+= _filename
;
155 snprintf(pid_file
, sizeof(pid_file
), "%s", _filename
.c_str());
156 atexit(remove_pidfile
);
161 } /* namespace util */
162 } /* namespace datadifferential */