70 lines
2.4 KiB
Plaintext
70 lines
2.4 KiB
Plaintext
# sys_random_h.m4
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# serial 8
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dnl Copyright (C) 2020-2024 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN_ONCE([gl_SYS_RANDOM_H],
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[
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AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
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dnl <sys/random.h> is always overridden, because of GNULIB_POSIXCHECK.
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gl_CHECK_NEXT_HEADERS([sys/random.h])
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if test $ac_cv_header_sys_random_h = yes; then
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HAVE_SYS_RANDOM_H=1
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else
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HAVE_SYS_RANDOM_H=0
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fi
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AC_SUBST([HAVE_SYS_RANDOM_H])
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m4_ifdef([gl_UNISTD_H_DEFAULTS], [AC_REQUIRE([gl_UNISTD_H_DEFAULTS])])
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if test $ac_cv_header_sys_random_h = yes; then
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UNISTD_H_HAVE_SYS_RANDOM_H=1
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fi
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dnl Check for declarations of anything we want to poison if the
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dnl corresponding gnulib module is not in use.
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gl_WARN_ON_USE_PREPARE([[
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#if HAVE_SYS_RANDOM_H
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/* Additional includes are needed before <sys/random.h> on uClibc
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and Mac OS X. */
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# include <sys/types.h>
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# include <stdlib.h>
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# include <sys/random.h>
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#endif
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]],
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[getrandom])
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])
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# gl_SYS_RANDOM_MODULE_INDICATOR([modulename])
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# sets the shell variable that indicates the presence of the given module
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# to a C preprocessor expression that will evaluate to 1.
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# This macro invocation must not occur in macros that are AC_REQUIREd.
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AC_DEFUN([gl_SYS_RANDOM_MODULE_INDICATOR],
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[
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dnl Ensure to expand the default settings once only.
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gl_SYS_RANDOM_H_REQUIRE_DEFAULTS
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gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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dnl Define it also as a C macro, for the benefit of the unit tests.
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gl_MODULE_INDICATOR_FOR_TESTS([$1])
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])
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# Initializes the default values for AC_SUBSTed shell variables.
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# This macro must not be AC_REQUIREd. It must only be invoked, and only
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# outside of macros or in macros that are not AC_REQUIREd.
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AC_DEFUN([gl_SYS_RANDOM_H_REQUIRE_DEFAULTS],
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[
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m4_defun(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS], [
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gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_GETRANDOM])
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])
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m4_require(GL_MODULE_INDICATOR_PREFIX[_SYS_RANDOM_H_MODULE_INDICATOR_DEFAULTS])
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AC_REQUIRE([gl_SYS_RANDOM_H_DEFAULTS])
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])
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AC_DEFUN([gl_SYS_RANDOM_H_DEFAULTS],
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[
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dnl Assume proper GNU behavior unless another module says otherwise.
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HAVE_GETRANDOM=1; AC_SUBST([HAVE_GETRANDOM])
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REPLACE_GETRANDOM=0; AC_SUBST([REPLACE_GETRANDOM])
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])
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