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root |
1.1 |
AC_PREREQ(2.59) |
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AC_INIT |
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AC_CONFIG_HEADERS([config.h]) |
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# Enable GNU extensions. |
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# Define this here, not in acconfig's @TOP@ section, since definitions |
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# in the latter don't make it into the configure-time tests. |
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AC_DEFINE([_GNU_SOURCE], 1, [Enable GNU extenstions]) |
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# do NOT define POSIX_SOURCE, since this clashes with many BSDs |
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dnl AC_DEFINE([_POSIX_SOURCE], 1, [Enable POSIX 1003.1 extensions]) |
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dnl AC_DEFINE([_XOPEN_SOURCE], 500, [Enable XOPEN extensions]) |
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AC_PROG_CC |
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AC_CACHE_CHECK(for readahead, ac_cv_readahead, [AC_LINK_IFELSE([ |
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#include <fcntl.h> |
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int main(void) |
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{ |
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int fd = 0; |
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off64_t offset = 1; |
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size_t count = 2; |
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ssize_t res; |
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res = readahead (fd, offset, count); |
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return 0; |
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} |
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],ac_cv_readahead=yes,ac_cv_readahead=no)]) |
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test $ac_cv_readahead = yes && AC_DEFINE(HAVE_READAHEAD, 1, readahead(2) is available (linux)) |
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AC_CACHE_CHECK(for fdatasync, ac_cv_fdatasync, [AC_LINK_IFELSE([ |
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#include <unistd.h> |
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int main(void) |
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{ |
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int fd = 0; |
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fdatasync (fd); |
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return 0; |
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} |
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],ac_cv_fdatasync=yes,ac_cv_fdatasync=no)]) |
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test $ac_cv_fdatasync = yes && AC_DEFINE(HAVE_FDATASYNC, 1, fdatasync(2) is available) |
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AC_CACHE_CHECK(for pread and pwrite, ac_cv_preadwrite, [AC_LINK_IFELSE([ |
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#include <unistd.h> |
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int main(void) |
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{ |
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int fd = 0; |
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size_t count = 1; |
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char buf; |
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off_t offset = 1; |
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ssize_t res; |
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res = pread (fd, &buf, count, offset); |
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res = pwrite (fd, &buf, count, offset); |
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return 0; |
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} |
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],ac_cv_preadwrite=yes,ac_cv_preadwrite=no)]) |
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test $ac_cv_preadwrite = yes && AC_DEFINE(HAVE_PREADWRITE, 1, pread(2) and pwrite(2) are available) |
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AC_OUTPUT |
