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dnl Autoconf macros used by PINENTRY
dnl
dnl Copyright (C) 2002, 2022 g10 Code GmbH
dnl
dnl
######################################################################
# Check whether mlock is broken (hpux 10.20 raises a SIGBUS if mlock
# is not called from uid 0 (not tested whether uid 0 works)
# For DECs Tru64 we have also to check whether mlock is in librt
# mlock is there a macro using memlk()
######################################################################
dnl GNUPG_CHECK_MLOCK
dnl
define(GNUPG_CHECK_MLOCK,
[ AC_CHECK_FUNCS(mlock)
if test "$ac_cv_func_mlock" = "no"; then
AC_CHECK_HEADERS(sys/mman.h)
if test "$ac_cv_header_sys_mman_h" = "yes"; then
# Add librt to LIBS:
AC_CHECK_LIB(rt, memlk)
AC_CACHE_CHECK([whether mlock is in sys/mman.h],
gnupg_cv_mlock_is_in_sys_mman,
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
#include <assert.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
]], [[
int i;
/* glibc defines this for functions which it implements
* to always fail with ENOSYS. Some functions are actually
* named something starting with __ and the normal name
* is an alias. */
#if defined (__stub_mlock) || defined (__stub___mlock)
choke me
#else
mlock(&i, 4);
#endif
; return 0;
]])],
gnupg_cv_mlock_is_in_sys_mman=yes,
gnupg_cv_mlock_is_in_sys_mman=no)])
if test "$gnupg_cv_mlock_is_in_sys_mman" = "yes"; then
AC_DEFINE(HAVE_MLOCK,1,
[Defined if the system supports an mlock() call])
fi
fi
fi
if test "$ac_cv_func_mlock" = "yes"; then
AC_CHECK_FUNCS(sysconf getpagesize)
AC_MSG_CHECKING(whether mlock is broken)
AC_CACHE_VAL(gnupg_cv_have_broken_mlock,
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
int main()
{
char *pool;
int err;
long int pgsize;
#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
pgsize = sysconf (_SC_PAGESIZE);
#elif defined (HAVE_GETPAGESIZE)
pgsize = getpagesize();
#else
pgsize = -1;
#endif
if (pgsize == -1)
pgsize = 4096;
pool = malloc( 4096 + pgsize );
if( !pool )
return 2;
pool += (pgsize - ((size_t)pool % pgsize));
err = mlock( pool, 4096 );
if( !err || errno == EPERM || errno == EAGAIN)
return 0; /* okay */
return 1; /* hmmm */
}
]])],
gnupg_cv_have_broken_mlock="no",
gnupg_cv_have_broken_mlock="yes",
gnupg_cv_have_broken_mlock="assume-no"
)
)
if test "$gnupg_cv_have_broken_mlock" = "yes"; then
AC_DEFINE(HAVE_BROKEN_MLOCK,1,
[Defined if the mlock() call does not work])
AC_MSG_RESULT(yes)
else
if test "$gnupg_cv_have_broken_mlock" = "no"; then
AC_MSG_RESULT(no)
else
AC_MSG_RESULT(assuming no)
fi
fi
fi
])
|
