- AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
- [AC_RUN_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <sys/types.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <fcntl.h>
- #ifndef O_NOATIME
- #define O_NOATIME 0
- #endif
- #ifndef O_NOFOLLOW
- #define O_NOFOLLOW 0
- #endif
- static int const constants[] =
- {
- O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
- O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
- };
- ]],
- [[
- int status = !constants;
- {
- static char const sym[] = "conftest.sym";
- if (symlink (".", sym) != 0
- || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
- status |= 32;
- }
- {
- static char const file[] = "confdefs.h";
- int fd = open (file, O_RDONLY | O_NOATIME);
- char c;
- struct stat st0, st1;
- if (fd < 0
- || fstat (fd, &st0) != 0
- || sleep (1) != 0
- || read (fd, &c, 1) != 1
- || close (fd) != 0
- || stat (file, &st1) != 0
- || st0.st_atime != st1.st_atime)
- status |= 64;
- }
- return status;]])],
- [gl_cv_header_working_fcntl_h=yes],
- [case $? in #(
- 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
- 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
- 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
- *) gl_cv_header_working_fcntl_h='no';;
- esac],
- [gl_cv_header_working_fcntl_h=cross-compiling])])
-
- case $gl_cv_header_working_fcntl_h in #(
- *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
- *) ac_val=1;;
- esac
- AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
- [Define to 1 if O_NOATIME works.])
-
- case $gl_cv_header_working_fcntl_h in #(
- *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
- *) ac_val=1;;
- esac
- AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
- [Define to 1 if O_NOFOLLOW works.])
-