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/*
* Copyright (C) 2012-2015 Max Kellermann <max@duempel.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "FileDescriptor.hxx"
#include <sys/stat.h>
#include <fcntl.h>
#ifndef WIN32
#include <poll.h>
#endif
#ifdef USE_EVENTFD
#include <sys/eventfd.h>
#endif
#ifdef USE_SIGNALFD
#include <sys/signalfd.h>
#endif
#ifdef HAVE_INOTIFY_INIT
#include <sys/inotify.h>
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
bool
FileDescriptor::Open(const char *pathname, int flags, mode_t mode)
{
fd = ::open(pathname, flags | O_NOCTTY | O_CLOEXEC, mode);
return IsDefined();
}
bool
FileDescriptor::OpenReadOnly(const char *pathname)
{
return Open(pathname, O_RDONLY);
}
#ifndef WIN32
bool
FileDescriptor::OpenNonBlocking(const char *pathname)
{
return Open(pathname, O_RDWR | O_NONBLOCK);
}
bool
FileDescriptor::CreatePipe(FileDescriptor &r, FileDescriptor &w)
{
int fds[2];
#ifdef HAVE_PIPE2
const int flags = O_CLOEXEC;
const int result = pipe2(fds, flags);
#else
const int result = pipe(fds);
#endif
if (result < 0)
return false;
r = FileDescriptor(fds[0]);
w = FileDescriptor(fds[1]);
return true;
}
void
FileDescriptor::SetNonBlocking()
{
assert(IsDefined());
int flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags | O_NONBLOCK);
}
void
FileDescriptor::SetBlocking()
{
assert(IsDefined());
int flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
}
#endif
#ifdef USE_EVENTFD
bool
FileDescriptor::CreateEventFD(unsigned initval)
{
fd = ::eventfd(initval, EFD_NONBLOCK|EFD_CLOEXEC);
return fd >= 0;
}
#endif
#ifdef USE_SIGNALFD
bool
FileDescriptor::CreateSignalFD(const sigset_t *mask)
{
int new_fd = ::signalfd(fd, mask, SFD_NONBLOCK|SFD_CLOEXEC);
if (new_fd < 0)
return false;
fd = new_fd;
return true;
}
#endif
#ifdef HAVE_INOTIFY_INIT
bool
FileDescriptor::CreateInotify()
{
#ifdef HAVE_INOTIFY_INIT1
int new_fd = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
#else
int new_fd = inotify_init();
#endif
if (new_fd < 0)
return false;
#ifndef HAVE_INOTIFY_INIT1
SetNonBlocking();
#endif
fd = new_fd;
return true;
}
#endif
bool
FileDescriptor::Rewind()
{
assert(IsDefined());
return lseek(fd, 0, SEEK_SET) == 0;
}
off_t
FileDescriptor::GetSize() const
{
struct stat st;
return ::fstat(fd, &st) >= 0
? (long)st.st_size
: -1;
}
#ifndef WIN32
int
FileDescriptor::Poll(short events, int timeout) const
{
assert(IsDefined());
struct pollfd pfd;
pfd.fd = fd;
pfd.events = events;
int result = poll(&pfd, 1, timeout);
return result > 0
? pfd.revents
: result;
}
int
FileDescriptor::WaitReadable(int timeout) const
{
return Poll(POLLIN, timeout);
}
int
FileDescriptor::WaitWritable(int timeout) const
{
return Poll(POLLOUT, timeout);
}
#endif
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