AC_DEFUN([TORRENT_CHECK_XFS], [
  AC_MSG_CHECKING(for XFS support)

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
      #include <xfs/libxfs.h>
      #include <sys/ioctl.h>
      int main() {
        struct xfs_flock64 l;
        ioctl(0, XFS_IOC_RESVSP64, &l);
        return 0;
      }
      ])],
    [
      AC_DEFINE(USE_XFS, 1, Use XFS filesystem stuff.)
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
    ])
])


AC_DEFUN([TORRENT_WITHOUT_XFS], [
  AC_ARG_WITH(xfs,
    AC_HELP_STRING([--without-xfs], [do not check for XFS filesystem support]),
    [
       if test "$withval" = "yes"; then
        TORRENT_CHECK_XFS
      fi
    ], [
        TORRENT_CHECK_XFS
    ])
])


AC_DEFUN([TORRENT_WITH_XFS], [
  AC_ARG_WITH(xfs,
    AC_HELP_STRING([--with-xfs], [check for XFS filesystem support]),
    [
      if test "$withval" = "yes"; then
        TORRENT_CHECK_XFS
      fi
    ])
])


AC_DEFUN([TORRENT_CHECK_EPOLL], [
  AC_MSG_CHECKING(for epoll support)

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
      #include <sys/epoll.h>
      int main() {
        int fd = epoll_create(100);
        return 0;
      }
      ])],
    [
      AC_DEFINE(USE_EPOLL, 1, Use epoll.)
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
    ])
])

AC_DEFUN([TORRENT_WITHOUT_EPOLL], [
  AC_ARG_WITH(epoll,
    AC_HELP_STRING([--without-epoll], [do not check for epoll support]),
    [
      if test "$withval" = "yes"; then
        TORRENT_CHECK_EPOLL
      fi
    ], [
        TORRENT_CHECK_EPOLL
    ])
])


AC_DEFUN([TORRENT_CHECK_KQUEUE], [
  AC_MSG_CHECKING(for kqueue support)

  AC_LINK_IFELSE([AC_LANG_SOURCE([
      #include <sys/time.h>  /* Because OpenBSD's sys/event.h fails to compile otherwise. Yeah... */
      #include <sys/event.h>
      int main() {
        int fd = kqueue();
        return 0;
      }
      ])],
    [
      AC_DEFINE(USE_KQUEUE, 1, Use kqueue.)
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
    ])
])

AC_DEFUN([TORRENT_CHECK_KQUEUE_SOCKET_ONLY], [
  AC_MSG_CHECKING(whether kqueue supports pipes and ptys)

  AC_RUN_IFELSE([AC_LANG_SOURCE([
      #include <fcntl.h>
      #include <stdlib.h>
      #include <unistd.h>
      #include <sys/event.h>
      #include <sys/time.h>
      int main() {
        struct kevent ev@<:@2@:>@, ev_out@<:@2@:>@;
        struct timespec ts = { 0, 0 };
        int pfd@<:@2@:>@, pty@<:@2@:>@, kfd, n;
        char buffer@<:@9001@:>@;
        if (pipe(pfd) == -1) return 1;
        if (fcntl(pfd@<:@1@:>@, F_SETFL, O_NONBLOCK) == -1) return 2;
        while ((n = write(pfd@<:@1@:>@, buffer, sizeof(buffer))) == sizeof(buffer));
        if ((pty@<:@0@:>@=posix_openpt(O_RDWR | O_NOCTTY)) == -1) return 3;
        if ((pty@<:@1@:>@=grantpt(pty@<:@0@:>@)) == -1) return 4;
        EV_SET(ev+0, pfd@<:@1@:>@, EVFILT_WRITE, EV_ADD | EV_ENABLE, 0, 0, NULL);
        EV_SET(ev+1, pty@<:@1@:>@, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, NULL);
        if ((kfd = kqueue()) == -1) return 5;
        if ((n = kevent(kfd, ev, 2, NULL, 0, NULL)) == -1) return 6;
        if (ev_out@<:@0@:>@.flags & EV_ERROR) return 7;
        if (ev_out@<:@1@:>@.flags & EV_ERROR) return 8;
        read(pfd@<:@0@:>@, buffer, sizeof(buffer));
        if ((n = kevent(kfd, NULL, 0, ev_out, 2, &ts)) < 1) return 9;
        return 0;
      }
      ])],
    [
      AC_MSG_RESULT(yes)
    ], [
      AC_DEFINE(KQUEUE_SOCKET_ONLY, 1, kqueue only supports sockets.)
      AC_MSG_RESULT(no)
    ])
])

AC_DEFUN([TORRENT_WITH_KQUEUE], [
  AC_ARG_WITH(kqueue,
    AC_HELP_STRING([--with-kqueue], [enable kqueue [[default=no]]]),
    [
        if test "$withval" = "yes"; then
          TORRENT_CHECK_KQUEUE
          TORRENT_CHECK_KQUEUE_SOCKET_ONLY
        fi
    ])
])


AC_DEFUN([TORRENT_WITHOUT_KQUEUE], [
  AC_ARG_WITH(kqueue,
    AC_HELP_STRING([--without-kqueue], [do not check for kqueue support]),
    [
      if test "$withval" = "yes"; then
        TORRENT_CHECK_KQUEUE
        TORRENT_CHECK_KQUEUE_SOCKET_ONLY
      fi
    ], [
        TORRENT_CHECK_KQUEUE
        TORRENT_CHECK_KQUEUE_SOCKET_ONLY
    ])
])


AC_DEFUN([TORRENT_WITHOUT_VARIABLE_FDSET], [
  AC_ARG_WITH(variable-fdset,
    AC_HELP_STRING([--without-variable-fdset], [do not use non-portable variable sized fd_set's]),
    [
      if test "$withval" = "yes"; then
        AC_DEFINE(USE_VARIABLE_FDSET, 1, defined when we allow the use of fd_set's of any size)
      fi
    ], [
      AC_DEFINE(USE_VARIABLE_FDSET, 1, defined when we allow the use of fd_set's of any size)
    ])
])


AC_DEFUN([TORRENT_CHECK_FALLOCATE], [
  AC_MSG_CHECKING(for fallocate)

  AC_TRY_LINK([#include <fcntl.h>
               #include <linux/falloc.h>
              ],[ fallocate(0, FALLOC_FL_KEEP_SIZE, 0, 0); return 0;
              ],
    [
      AC_DEFINE(HAVE_FALLOCATE, 1, Linux's fallocate supported.)
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
    ])
])


AC_DEFUN([TORRENT_CHECK_POSIX_FALLOCATE], [
  AC_MSG_CHECKING(for posix_fallocate)

  AC_TRY_LINK([#include <fcntl.h>
              ],[ posix_fallocate(0, 0, 0);
              ],
    [
      AC_DEFINE(USE_POSIX_FALLOCATE, 1, posix_fallocate supported.)
      AC_MSG_RESULT(yes)
    ], [
      AC_MSG_RESULT(no)
    ])
])


AC_DEFUN([TORRENT_WITH_POSIX_FALLOCATE], [
  AC_ARG_WITH(posix-fallocate,
    AC_HELP_STRING([--with-posix-fallocate], [check for and use posix_fallocate to allocate files]),
    [
      if test "$withval" = "yes"; then
        TORRENT_CHECK_POSIX_FALLOCATE
      fi
    ])
])

AC_DEFUN([TORRENT_CHECK_STATVFS], [
  AC_CHECK_HEADERS(sys/vfs.h sys/statvfs.h sys/statfs.h)

  AC_MSG_CHECKING(for statvfs)

  AC_TRY_LINK(
    [
      #if HAVE_SYS_VFS_H
      #include <sys/vfs.h>
      #endif
      #if HAVE_SYS_STATVFS_H
      #include <sys/statvfs.h>
      #endif
      #if HAVE_SYS_STATFS_H
      #include <sys/statfs.h>
      #endif
    ],[
      struct statvfs s; fsblkcnt_t c;
      statvfs("", &s);
      fstatvfs(0, &s);
    ],
    [
      AC_DEFINE(FS_STAT_FD, [fstatvfs(fd, &m_stat) == 0], Function to determine filesystem stats from fd)
      AC_DEFINE(FS_STAT_FN, [statvfs(fn, &m_stat) == 0], Function to determine filesystem stats from filename)
      AC_DEFINE(FS_STAT_STRUCT, [struct statvfs], Type of second argument to statfs function)
      AC_DEFINE(FS_STAT_SIZE_TYPE, [unsigned long], Type of block size member in stat struct)
      AC_DEFINE(FS_STAT_COUNT_TYPE, [fsblkcnt_t], Type of block count member in stat struct)
      AC_DEFINE(FS_STAT_BLOCK_SIZE, [(m_stat.f_frsize)], Determine the block size)
      AC_MSG_RESULT(ok)
      have_stat_vfs=yes
    ],
    [
      AC_MSG_RESULT(no)
      have_stat_vfs=no
    ])
])

AC_DEFUN([TORRENT_CHECK_STATFS], [
  AC_CHECK_HEADERS(sys/statfs.h sys/param.h sys/mount.h)

  AC_MSG_CHECKING(for statfs)

  AC_TRY_LINK(
    [
      #if HAVE_SYS_STATFS_H
      #include <sys/statfs.h>
      #endif
      #if HAVE_SYS_PARAM_H
      #include <sys/param.h>
      #endif
      #if HAVE_SYS_MOUNT_H
      #include <sys/mount.h>
      #endif
    ],[
      struct statfs s;
      statfs("", &s);
      fstatfs(0, &s);
    ],
    [
      AC_DEFINE(FS_STAT_FD, [fstatfs(fd, &m_stat) == 0], Function to determine filesystem stats from fd)
      AC_DEFINE(FS_STAT_FN, [statfs(fn, &m_stat) == 0], Function to determine filesystem stats from filename)
      AC_DEFINE(FS_STAT_STRUCT, [struct statfs], Type of second argument to statfs function)
      AC_DEFINE(FS_STAT_SIZE_TYPE, [long], Type of block size member in stat struct)
      AC_DEFINE(FS_STAT_COUNT_TYPE, [long], Type of block count member in stat struct)
      AC_DEFINE(FS_STAT_BLOCK_SIZE, [(m_stat.f_bsize)], Determine the block size)
      AC_MSG_RESULT(ok)
      have_stat_vfs=yes
    ],
    [
      AC_MSG_RESULT(no)
      have_stat_vfs=no
    ])
])

AC_DEFUN([TORRENT_DISABLED_STATFS], [
      AC_DEFINE(FS_STAT_FD, [(errno = ENOSYS) == 0], Function to determine filesystem stats from fd)
      AC_DEFINE(FS_STAT_FN, [(errno = ENOSYS) == 0], Function to determine filesystem stats from filename)
      AC_DEFINE(FS_STAT_STRUCT, [struct {blocksize_type  f_bsize; blockcount_type f_bavail;}], Type of second argument to statfs function)
      AC_DEFINE(FS_STAT_SIZE_TYPE, [int], Type of block size member in stat struct)
      AC_DEFINE(FS_STAT_COUNT_TYPE, [int], Type of block count member in stat struct)
      AC_DEFINE(FS_STAT_BLOCK_SIZE, [(4096)], Determine the block size)
      AC_MSG_RESULT(No filesystem stats available)
])

AC_DEFUN([TORRENT_WITHOUT_STATVFS], [
  AC_ARG_WITH(statvfs,
    AC_HELP_STRING([--without-statvfs], [don't try to use statvfs to find free diskspace]),
    [
      if test "$withval" = "yes"; then
        TORRENT_CHECK_STATVFS
      else
        have_stat_vfs=no
      fi
    ],
    [
      TORRENT_CHECK_STATVFS
    ])
])

AC_DEFUN([TORRENT_WITHOUT_STATFS], [
  AC_ARG_WITH(statfs,
    AC_HELP_STRING([--without-statfs], [don't try to use statfs to find free diskspace]),
    [
      if test "$have_stat_vfs" = "no"; then
        if test "$withval" = "yes"; then
          TORRENT_CHECK_STATFS
        else
          TORRENT_DISABLED_STATFS
        fi
      fi
    ],
    [
      if test "$have_stat_vfs" = "no"; then
        TORRENT_CHECK_STATFS
        if test "$have_stat_vfs" = "no"; then
          TORRENT_DISABLED_STATFS
        fi
      fi
    ])
])

AC_DEFUN([TORRENT_WITH_ADDRESS_SPACE], [
  AC_ARG_WITH(address-space,
    AC_HELP_STRING([--with-address-space=MB], [change the default address space size [[default=1024mb]]]),
    [
      if test ! -z $withval -a "$withval" != "yes" -a "$withval" != "no"; then
        AC_DEFINE_UNQUOTED(DEFAULT_ADDRESS_SPACE_SIZE, [$withval])
      else
        AC_MSG_ERROR(--with-address-space requires a parameter.)
      fi
    ],
    [
      AC_CHECK_SIZEOF(long)

      if test $ac_cv_sizeof_long = 8; then
        AC_DEFINE(DEFAULT_ADDRESS_SPACE_SIZE, 4096, Default address space size.)
      else
        AC_DEFINE(DEFAULT_ADDRESS_SPACE_SIZE, 1024, Default address space size.)
      fi
    ])
])

AC_DEFUN([TORRENT_WITH_FASTCGI], [
  AC_ARG_WITH(fastcgi,
    AC_HELP_STRING([--with-fastcgi=PATH], [enable FastCGI RPC support (DO NOT USE)]),
    [
      AC_MSG_CHECKING([for FastCGI (DO NOT USE)])

      if test "$withval" = "no"; then
        AC_MSG_RESULT(no)

      elif test "$withval" = "yes"; then
        CXXFLAGS="$CXXFLAGS"
	LIBS="$LIBS -lfcgi"        

        AC_TRY_LINK(
        [ #include <fcgiapp.h>
        ],[ FCGX_Init(); ],
        [
          AC_MSG_RESULT(ok)
        ],
        [
          AC_MSG_RESULT(not found)
          AC_MSG_ERROR(Could not compile FastCGI test.)
        ])

        AC_DEFINE(HAVE_FASTCGI, 1, Support for FastCGI.)

      else
        CXXFLAGS="$CXXFLAGS -I$withval/include"
	LIBS="$LIBS -lfcgi -L$withval/lib"

        AC_TRY_LINK(
        [ #include <fcgiapp.h>
        ],[ FCGX_Init(); ],
        [
          AC_MSG_RESULT(ok)
        ],
        [
          AC_MSG_RESULT(not found)
          AC_MSG_ERROR(Could not compile FastCGI test.)
        ])

        AC_DEFINE(HAVE_FASTCGI, 1, Support for FastCGI.)
      fi
    ])
])


AC_DEFUN([TORRENT_WITH_XMLRPC_C], [
  AC_MSG_CHECKING(for XMLRPC-C)

  AC_ARG_WITH(xmlrpc-c,
    AC_HELP_STRING([--with-xmlrpc-c=PATH], [enable XMLRPC-C support]),
  [
    if test "$withval" = "no"; then
      AC_MSG_RESULT(no)

    else
      if test "$withval" = "yes"; then
        xmlrpc_cc_prg="xmlrpc-c-config"
      else
        xmlrpc_cc_prg="$withval"
      fi
      
      if eval $xmlrpc_cc_prg --version 2>/dev/null >/dev/null; then
        CXXFLAGS="$CXXFLAGS `$xmlrpc_cc_prg --cflags server-util`"
        LIBS="$LIBS `$xmlrpc_cc_prg server-util --libs`"

        AC_TRY_LINK(
        [ #include <xmlrpc-c/server.h>
        ],[ xmlrpc_registry_new(NULL); ],
        [
          AC_MSG_RESULT(ok)
        ], [
          AC_MSG_RESULT(failed)
          AC_MSG_ERROR(Could not compile XMLRPC-C test.)
        ])

        AC_DEFINE(HAVE_XMLRPC_C, 1, Support for XMLRPC-C.)

      else
        AC_MSG_RESULT(failed)
        AC_MSG_ERROR(Could not compile XMLRPC-C test.)
      fi
    fi

  ],[
    AC_MSG_RESULT(ignored)
  ])
])


AC_DEFUN([TORRENT_WITH_INOTIFY], [
  AC_LANG_PUSH(C++)

  AC_CHECK_HEADERS([sys/inotify.h mcheck.h])
  AC_MSG_CHECKING([whether sys/inotify.h actually works])

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([
      #include <sys/inotify.h>
      int main(int,const char**) { return (-1 == inotify_init()); }])
    ],[
     AC_DEFINE(HAVE_INOTIFY, 1, [sys/inotify.h exists and works correctly])
     AC_MSG_RESULT(yes)],
    [AC_MSG_RESULT(failed)]
  )

  AC_LANG_POP(C++)
])

AC_DEFUN([TORRENT_CHECK_PTHREAD_SETNAME_NP], [
  AC_CHECK_HEADERS(pthread.h)

  AC_MSG_CHECKING(for pthread_setname_np type)

  AC_TRY_LINK([
    #include <pthread.h>
    #include <sys/types.h>
  ],[
    pthread_t t;
    pthread_setname_np(t, "foo");
  ],[
    AC_DEFINE(HAS_PTHREAD_SETNAME_NP_GENERIC, 1, The function to set pthread name has a pthread_t argumet.)
    AC_MSG_RESULT(generic)
  ],[
    AC_TRY_LINK([
      #include <pthread.h>
      #include <sys/types.h>
    ],[
      pthread_t t;
      pthread_setname_np("foo");
    ],[
      AC_DEFINE(HAS_PTHREAD_SETNAME_NP_DARWIN, 1, The function to set pthread name has no pthread argument.)
      AC_MSG_RESULT(darwin)
    ],[
      AC_MSG_RESULT(no)
    ])
  ])
])