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