diff options
Diffstat (limited to 'acinclude.m4')
| -rw-r--r-- | acinclude.m4 | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/acinclude.m4 b/acinclude.m4 new file mode 100644 index 0000000..7dfad70 --- /dev/null +++ b/acinclude.m4 @@ -0,0 +1,117 @@ +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 + ]) |