AC_SEARCH_LIBS(
   pthread_create,
   [pthread pthreads pthreadVC2],
   ,
   [AC_MSG_ERROR(pthread functions not found)]
)

AC_CACHE_CHECK(for utimes, ac_cv_utimes, [AC_LINK_IFELSE([[
#include <sys/types.h>
#include <sys/time.h>
#include <utime.h>
struct timeval tv[2];
int res;
int main (void)
{
   res = utimes ("/", tv);
   return 0;
}
]],ac_cv_utimes=yes,ac_cv_utimes=no)])
test $ac_cv_utimes = yes && AC_DEFINE(HAVE_UTIMES, 1, utimes(2) is available)

AC_CACHE_CHECK(for futimes, ac_cv_futimes, [AC_LINK_IFELSE([[
#include <sys/types.h>
#include <sys/time.h>
#include <utime.h>
struct timeval tv[2];
int res;
int fd;
int main (void)
{
   res = futimes (fd, tv);
   return 0;
}
]],ac_cv_futimes=yes,ac_cv_futimes=no)])
test $ac_cv_futimes = yes && AC_DEFINE(HAVE_FUTIMES, 1, futimes(2) is available)

AC_CACHE_CHECK(for readahead, ac_cv_readahead, [AC_LINK_IFELSE([
#include <fcntl.h>
int main (void)
{
   int fd = 0;
   size_t count = 2;
   ssize_t res;
   res = readahead (fd, 0, count);
   return 0;
}
],ac_cv_readahead=yes,ac_cv_readahead=no)])
test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux))

AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([
#include <unistd.h>
int main (void)
{
   int fd = 0;
   fdatasync (fd);
   return 0;
}
],ac_cv_fdatasync=yes,ac_cv_fdatasync=no)])
test $ac_cv_fdatasync = yes && AC_DEFINE(HAVE_FDATASYNC, 1, fdatasync(2) is available)

AC_CACHE_CHECK(for pread and pwrite, ac_cv_preadwrite, [AC_LINK_IFELSE([
#include <unistd.h>
int main (void)
{
   int fd = 0;
   size_t count = 1;
   char buf;
   off_t offset = 1;
   ssize_t res;
   res = pread (fd, &buf, count, offset);
   res = pwrite (fd, &buf, count, offset);
   return 0;
}
],ac_cv_preadwrite=yes,ac_cv_preadwrite=no)])
test $ac_cv_preadwrite = yes && AC_DEFINE(HAVE_PREADWRITE, 1, pread(2) and pwrite(2) are available)

AC_CACHE_CHECK(for sendfile, ac_cv_sendfile, [AC_LINK_IFELSE([
# include <sys/types.h>
#if __linux
# include <sys/sendfile.h>
#elif __FreeBSD__ || defined __APPLE__
# include <sys/socket.h>
# include <sys/uio.h>
#elif __hpux
# include <sys/socket.h>
#else
# error unsupported architecture
#endif
int main (void)
{
   int fd = 0;
   off_t offset = 1;
   size_t count = 2;
   ssize_t res;
#if __linux
   res = sendfile (fd, fd, offset, count);
#elif __FreeBSD__
   res = sendfile (fd, fd, offset, count, 0, &offset, 0);
#elif __hpux
   res = sendfile (fd, fd, offset, count, 0, 0);
#endif
   return 0;
}
],ac_cv_sendfile=yes,ac_cv_sendfile=no)])
test $ac_cv_sendfile = yes && AC_DEFINE(HAVE_SENDFILE, 1, sendfile(2) is available and supported)

AC_CACHE_CHECK(for sync_file_range, ac_cv_sync_file_range, [AC_LINK_IFELSE([
#include <fcntl.h>
int main (void)
{
   int fd = 0;
   off64_t offset = 1;
   off64_t nbytes = 1;
   unsigned int flags = SYNC_FILE_RANGE_WAIT_BEFORE|SYNC_FILE_RANGE_WRITE|SYNC_FILE_RANGE_WAIT_AFTER;
   ssize_t res;
   res = sync_file_range (fd, offset, nbytes, flags);
   return 0;
}
],ac_cv_sync_file_range=yes,ac_cv_sync_file_range=no)])
test $ac_cv_sync_file_range = yes && AC_DEFINE(HAVE_SYNC_FILE_RANGE, 1, sync_file_range(2) is available)

dnl #############################################################################
dnl # these checks exist for the benefit of IO::AIO

dnl at least uclibc defines _POSIX_ADVISORY_INFO without *any* of the required
dnl functionality actually being present. ugh.
AC_CACHE_CHECK(for posix_madvise, ac_cv_posix_madvise, [AC_LINK_IFELSE([
#include <sys/mman.h>
int main (void)
{
   int res = posix_madvise ((void *)0, (size_t)0, POSIX_MADV_NORMAL);
   int a = POSIX_MADV_SEQUENTIAL;
   int b = POSIX_MADV_RANDOM;
   int c = POSIX_MADV_WILLNEED;
   int d = POSIX_MADV_DONTNEED;
   return 0;
}
],ac_cv_posix_madvise=yes,ac_cv_posix_madvise=no)])
test $ac_cv_posix_madvise = yes && AC_DEFINE(HAVE_POSIX_MADVISE, 1, posix_madvise(2) is available)

AC_CACHE_CHECK(for posix_fadvise, ac_cv_posix_fadvise, [AC_LINK_IFELSE([
#define _XOPEN_SOURCE 600
#include <fcntl.h>
int main (void)
{
   int res = posix_fadvise ((int)0, (off_t)0, (off_t)0, POSIX_FADV_NORMAL);
   int a = POSIX_FADV_SEQUENTIAL;
   int b = POSIX_FADV_NOREUSE;
   int c = POSIX_FADV_RANDOM;
   int d = POSIX_FADV_WILLNEED;
   int e = POSIX_FADV_DONTNEED;
   return 0;
}
],ac_cv_posix_fadvise=yes,ac_cv_posix_fadvise=no)])
test $ac_cv_posix_fadvise = yes && AC_DEFINE(HAVE_POSIX_FADVISE, 1, posix_fadvise(2) is available)