| 1 |
AC_PREREQ(2.59) |
| 2 |
AC_INIT |
| 3 |
AC_CONFIG_HEADERS([config.h]) |
| 4 |
|
| 5 |
# Enable GNU extensions. |
| 6 |
# Define this here, not in acconfig's @TOP@ section, since definitions |
| 7 |
# in the latter don't make it into the configure-time tests. |
| 8 |
AC_DEFINE([_GNU_SOURCE], 1, [Enable GNU extenstions]) |
| 9 |
|
| 10 |
# do NOT define POSIX_SOURCE, since this clashes with many BSDs |
| 11 |
dnl AC_DEFINE([_POSIX_SOURCE], 1, [Enable POSIX 1003.1 extensions]) |
| 12 |
dnl AC_DEFINE([_XOPEN_SOURCE], 500, [Enable XOPEN extensions]) |
| 13 |
|
| 14 |
AC_PROG_CC |
| 15 |
|
| 16 |
AC_CACHE_CHECK(for readahead, ac_cv_readahead, [AC_LINK_IFELSE([ |
| 17 |
#include <fcntl.h> |
| 18 |
int main(void) |
| 19 |
{ |
| 20 |
int fd = 0; |
| 21 |
off64_t offset = 1; |
| 22 |
size_t count = 2; |
| 23 |
ssize_t res; |
| 24 |
res = readahead (fd, offset, count); |
| 25 |
return 0; |
| 26 |
} |
| 27 |
],ac_cv_readahead=yes,ac_cv_readahead=no)]) |
| 28 |
test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux)) |
| 29 |
|
| 30 |
AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([ |
| 31 |
#include <unistd.h> |
| 32 |
int main(void) |
| 33 |
{ |
| 34 |
int fd = 0; |
| 35 |
fdatasync (fd); |
| 36 |
return 0; |
| 37 |
} |
| 38 |
],ac_cv_fdatasync=yes,ac_cv_fdatasync=no)]) |
| 39 |
test $ac_cv_fdatasync = yes && AC_DEFINE(HAVE_FDATASYNC, 1, fdatasync(2) is available) |
| 40 |
|
| 41 |
AC_CACHE_CHECK(for pread and pwrite, ac_cv_preadwrite, [AC_LINK_IFELSE([ |
| 42 |
#include <unistd.h> |
| 43 |
int main(void) |
| 44 |
{ |
| 45 |
int fd = 0; |
| 46 |
size_t count = 1; |
| 47 |
char buf; |
| 48 |
off_t offset = 1; |
| 49 |
ssize_t res; |
| 50 |
res = pread (fd, &buf, count, offset); |
| 51 |
res = pwrite (fd, &buf, count, offset); |
| 52 |
return 0; |
| 53 |
} |
| 54 |
],ac_cv_preadwrite=yes,ac_cv_preadwrite=no)]) |
| 55 |
test $ac_cv_preadwrite = yes && AC_DEFINE(HAVE_PREADWRITE, 1, pread(2) and pwrite(2) are available) |
| 56 |
|
| 57 |
AC_OUTPUT |
