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-rw-r--r--acinclude.m4117
1 files changed, 117 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4
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+dnl Autoconf macros used by PINENTRY
+dnl
+dnl Copyright (C) 2002 g10 Code GmbH
+dnl
+dnl
+dnl GNUPG_CHECK_TYPEDEF(TYPE, HAVE_NAME)
+dnl Check whether a typedef exists and create a #define $2 if it exists
+dnl
+AC_DEFUN([GNUPG_CHECK_TYPEDEF],
+ [ AC_MSG_CHECKING(for $1 typedef)
+ AC_CACHE_VAL(gnupg_cv_typedef_$1,
+ [AC_TRY_COMPILE([#define _GNU_SOURCE 1
+ #include <stdlib.h>
+ #include <sys/types.h>], [
+ #undef $1
+ int a = sizeof($1);
+ ], gnupg_cv_typedef_$1=yes, gnupg_cv_typedef_$1=no )])
+ AC_MSG_RESULT($gnupg_cv_typedef_$1)
+ if test "$gnupg_cv_typedef_$1" = yes; then
+ AC_DEFINE($2,1,[Defined if a `]$1[' is typedef'd])
+ fi
+ ])
+
+
+######################################################################
+# Check whether mlock is broken (hpux 10.20 raises a SIGBUS if mlock
+# is not called from uid 0 (not tested whether uid 0 works)
+# For DECs Tru64 we have also to check whether mlock is in librt
+# mlock is there a macro using memlk()
+######################################################################
+dnl GNUPG_CHECK_MLOCK
+dnl
+define([GNUPG_CHECK_MLOCK],
+ [ AC_CHECK_FUNCS(mlock)
+ if test "$ac_cv_func_mlock" = "no"; then
+ AC_CHECK_HEADERS(sys/mman.h)
+ if test "$ac_cv_header_sys_mman_h" = "yes"; then
+ # Add librt to LIBS:
+ AC_CHECK_LIB(rt, memlk)
+ AC_CACHE_CHECK([whether mlock is in sys/mman.h],
+ gnupg_cv_mlock_is_in_sys_mman,
+ [AC_TRY_LINK([
+ #include <assert.h>
+ #ifdef HAVE_SYS_MMAN_H
+ #include <sys/mman.h>
+ #endif
+ ], [
+ int i;
+
+ /* glibc defines this for functions which it implements
+ * to always fail with ENOSYS. Some functions are actually
+ * named something starting with __ and the normal name
+ * is an alias. */
+ #if defined (__stub_mlock) || defined (__stub___mlock)
+ choke me
+ #else
+ mlock(&i, 4);
+ #endif
+ ; return 0;
+ ],
+ gnupg_cv_mlock_is_in_sys_mman=yes,
+ gnupg_cv_mlock_is_in_sys_mman=no)])
+ if test "$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 "$ac_cv_func_mlock" = "yes"; then
+ AC_MSG_CHECKING(whether mlock is broken)
+ AC_CACHE_VAL(gnupg_cv_have_broken_mlock,
+ AC_TRY_RUN([
+ #include <stdlib.h>
+ #include <unistd.h>
+ #include <errno.h>
+ #include <sys/mman.h>
+ #include <sys/types.h>
+ #include <fcntl.h>
+
+ int main()
+ {
+ char *pool;
+ int err;
+ long int pgsize = getpagesize();
+
+ pool = malloc( 4096 + pgsize );
+ if( !pool )
+ return 2;
+ pool += (pgsize - ((long int)pool % pgsize));
+
+ err = mlock( pool, 4096 );
+ if( !err || errno == EPERM )
+ return 0; /* okay */
+
+ return 1; /* hmmm */
+ }
+
+ ],
+ gnupg_cv_have_broken_mlock="no",
+ gnupg_cv_have_broken_mlock="yes",
+ gnupg_cv_have_broken_mlock="assume-no"
+ )
+ )
+ if test "$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)
+ AC_CHECK_FUNCS(plock)
+ else
+ if test "$gnupg_cv_have_broken_mlock" = "no"; then
+ AC_MSG_RESULT(no)
+ else
+ AC_MSG_RESULT(assuming no)
+ fi
+ fi
+ fi
+ ])
bgstack15