--- libeio/libeio.m4	2010/12/01 07:30:39	1.11
+++ libeio/libeio.m4	2012/06/02 20:13:26	1.20
@@ -1,3 +1,7 @@
+dnl openbsd in it's neverending brokenness requires stdint.h for intptr_t,
+dnl but that header isn't very portable...
+AC_CHECK_HEADERS([stdint.h sys/syscall.h sys/prctl.h])
+
 AC_SEARCH_LIBS(
    pthread_create,
    [pthread pthreads pthreadVC2],
@@ -58,22 +62,6 @@
 ],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
@@ -119,3 +107,89 @@
 ],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)
 
+AC_CACHE_CHECK(for fallocate, ac_cv_linux_fallocate, [AC_LINK_IFELSE([
+#include <fcntl.h>
+int main (void)
+{
+   int fd = 0;
+   int mode = 0;
+   off_t offset = 1;
+   off_t len = 1;
+   int res;
+   res = fallocate (fd, mode, offset, len);
+   return 0;
+}
+],ac_cv_linux_fallocate=yes,ac_cv_linux_fallocate=no)])
+test $ac_cv_linux_fallocate = yes && AC_DEFINE(HAVE_LINUX_FALLOCATE, 1, fallocate(2) is available)
+
+AC_CACHE_CHECK(for sys_syncfs, ac_cv_sys_syncfs, [AC_LINK_IFELSE([
+#include <unistd.h>
+#include <sys/syscall.h>
+int main (void)
+{
+  int res = syscall (__NR_syncfs, (int)0);
+}
+],ac_cv_sys_syncfs=yes,ac_cv_sys_syncfs=no)])
+test $ac_cv_sys_syncfs = yes && AC_DEFINE(HAVE_SYS_SYNCFS, 1, syscall(__NR_syncfs) is available)
+
+AC_CACHE_CHECK(for prctl_set_name, ac_cv_prctl_set_name, [AC_LINK_IFELSE([
+#include <sys/prctl.h>
+int main (void)
+{
+  char name[] = "test123";
+  int res = prctl (PR_SET_NAME, (unsigned long)name, 0, 0, 0);
+}
+],ac_cv_prctl_set_name=yes,ac_cv_prctl_set_name=no)])
+test $ac_cv_prctl_set_name = yes && AC_DEFINE(HAVE_PRCTL_SET_NAME, 1, prctl(PR_SET_NAME) 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)
+
+dnl lots of linux specifics
+AC_CHECK_HEADERS([linux/fs.h linux/fiemap.h])
+
+AC_CACHE_CHECK([for splice, vmsplice and tee], ac_cv_linux_splice, [AC_LINK_IFELSE([
+#include <fcntl.h>
+int main (void)
+{
+   ssize_t res;
+   res = splice ((int)0, (loff_t)0, (int)0, (loff_t *)0, (size_t)0, SPLICE_F_MOVE | SPLICE_F_NONBLOCK | SPLICE_F_MORE);
+   res = tee ((int)0, (int)0, (size_t)0, SPLICE_F_NONBLOCK);
+   res = vmsplice ((int)0, (struct iovec *)0, 0, SPLICE_F_NONBLOCK | SPLICE_F_GIFT);
+   return 0;
+}
+],ac_cv_linux_splice=yes,ac_cv_linux_splice=no)])
+test $ac_cv_linux_splice = yes && AC_DEFINE(HAVE_LINUX_SPLICE, 1, splice/vmsplice/tee(2) are available)
+