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118 lines
4.0 KiB
118 lines
4.0 KiB
dnl Autoconf macros used by PINENTRY
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dnl
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dnl Copyright (C) 2002 g10 Code GmbH
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dnl
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dnl
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dnl GNUPG_CHECK_TYPEDEF(TYPE, HAVE_NAME)
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dnl Check whether a typedef exists and create a #define $2 if it exists
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dnl
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AC_DEFUN([GNUPG_CHECK_TYPEDEF],
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[ AC_MSG_CHECKING(for $1 typedef)
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AC_CACHE_VAL(gnupg_cv_typedef_$1,
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[AC_TRY_COMPILE([#define _GNU_SOURCE 1
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#include <stdlib.h>
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#include <sys/types.h>], [
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#undef $1
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int a = sizeof($1);
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], gnupg_cv_typedef_$1=yes, gnupg_cv_typedef_$1=no )])
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AC_MSG_RESULT($gnupg_cv_typedef_$1)
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if test "$gnupg_cv_typedef_$1" = yes; then
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AC_DEFINE($2,1,[Defined if a `]$1[' is typedef'd])
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fi
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])
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######################################################################
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# Check whether mlock is broken (hpux 10.20 raises a SIGBUS if mlock
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# is not called from uid 0 (not tested whether uid 0 works)
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# For DECs Tru64 we have also to check whether mlock is in librt
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# mlock is there a macro using memlk()
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######################################################################
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dnl GNUPG_CHECK_MLOCK
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dnl
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define([GNUPG_CHECK_MLOCK],
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[ AC_CHECK_FUNCS(mlock)
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if test "$ac_cv_func_mlock" = "no"; then
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AC_CHECK_HEADERS(sys/mman.h)
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if test "$ac_cv_header_sys_mman_h" = "yes"; then
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# Add librt to LIBS:
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AC_CHECK_LIB(rt, memlk)
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AC_CACHE_CHECK([whether mlock is in sys/mman.h],
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gnupg_cv_mlock_is_in_sys_mman,
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[AC_TRY_LINK([
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#include <assert.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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], [
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int i;
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/* glibc defines this for functions which it implements
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* to always fail with ENOSYS. Some functions are actually
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* named something starting with __ and the normal name
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* is an alias. */
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#if defined (__stub_mlock) || defined (__stub___mlock)
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choke me
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#else
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mlock(&i, 4);
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#endif
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; return 0;
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],
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gnupg_cv_mlock_is_in_sys_mman=yes,
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gnupg_cv_mlock_is_in_sys_mman=no)])
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if test "$gnupg_cv_mlock_is_in_sys_mman" = "yes"; then
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AC_DEFINE(HAVE_MLOCK,1,
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[Defined if the system supports an mlock() call])
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fi
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fi
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fi
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if test "$ac_cv_func_mlock" = "yes"; then
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AC_MSG_CHECKING(whether mlock is broken)
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AC_CACHE_VAL(gnupg_cv_have_broken_mlock,
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AC_TRY_RUN([
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <fcntl.h>
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int main()
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{
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char *pool;
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int err;
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long int pgsize = getpagesize();
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pool = malloc( 4096 + pgsize );
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if( !pool )
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return 2;
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pool += (pgsize - ((long int)pool % pgsize));
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err = mlock( pool, 4096 );
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if( !err || errno == EPERM )
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return 0; /* okay */
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return 1; /* hmmm */
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}
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],
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gnupg_cv_have_broken_mlock="no",
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gnupg_cv_have_broken_mlock="yes",
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gnupg_cv_have_broken_mlock="assume-no"
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)
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)
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if test "$gnupg_cv_have_broken_mlock" = "yes"; then
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AC_DEFINE(HAVE_BROKEN_MLOCK,1,
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[Defined if the mlock() call does not work])
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AC_MSG_RESULT(yes)
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AC_CHECK_FUNCS(plock)
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else
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if test "$gnupg_cv_have_broken_mlock" = "no"; then
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AC_MSG_RESULT(no)
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else
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AC_MSG_RESULT(assuming no)
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fi
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fi
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fi
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])
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