#serial 1 # Determine approximately how many files may be open simultaneously # in one process. This is approximate, since while running this test, # the configure script already has a few files open. # From Jim Meyering AC_DEFUN([UTILS_SYS_OPEN_MAX], [ AC_CACHE_CHECK([determine how many files may be open simultaneously], utils_cv_sys_open_max, [ AC_RUN_IFELSE([AC_LANG_SOURCE([[ #include #include #include int main () { FILE *result = fopen ("conftest.omax", "w"); int i = 1; /* Impose an arbitrary limit, in case some system has no effective limit on the number of simultaneously open files. */ while (i < 30000) { FILE *s = fopen ("conftest.op", "w"); if (!s) break; ++i; } fprintf (result, "%d\n", i); exit (fclose (result) == EOF); } ]])], [utils_cv_sys_open_max=`cat conftest.omax`], [utils_cv_sys_open_max='internal error in open-max.m4'], [utils_cv_sys_open_max='cross compiling run-test in open-max.m4'])]) AC_DEFINE_UNQUOTED([UTILS_OPEN_MAX], $utils_cv_sys_open_max, [the maximum number of simultaneously open files per process]) ])