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| -rw-r--r-- | m4/fpending.m4 | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/m4/fpending.m4 b/m4/fpending.m4 new file mode 100644 index 000000000..dab08032a --- /dev/null +++ b/m4/fpending.m4 @@ -0,0 +1,70 @@ +#serial 1 + +dnl From Jim Meyering +dnl Using code from emacs, based on suggestions from Paul Eggert +dnl and Ulrich Drepper. + +AC_DEFUN(jm_FUNC_FPENDING, +[ + AC_CHECK_HEADERS(stdio_ext.h) + AC_FEPLACE_FUNCS([__fpending]) + if test $ac_cv_func___fpending = no; then + AC_REPLACE_FUNCS(__fpending) + AC_CACHE_CHECK( + [how to determine the number of pending output bytes on a stream], + ac_cv_sys_pending_output_n_bytes, + [ + fp_save_DEFS=$DEFS + for ac_expr in \ + \ + '# glibc2' \ + 'fp->_IO_write_ptr - fp->_IO_write_base' \ + \ + '# traditional Unix' \ + 'fp->_ptr - fp->_base' \ + \ + '# BSD' \ + 'fp->_p - fp->_bf._base' \ + \ + '# SCO, Unixware' \ + 'fp->__ptr - fp->__base' \ + \ + '# old glibc?' \ + 'fp->__bufp - fp->__buffer' \ + \ + '# old glibc iostream?' \ + 'fp->_pptr - fp->_pbase' \ + \ + '# VMS' \ + '(*fp)->_ptr - (*fp)->_base' \ + \ + '# e.g., DGUX R4.11; the info is not available' \ + 1 \ + ; do + # Skip each embedded comment. + case "$ac_expr" in '#'*) continue;; esac +' + + DEFS="$DEFS -DPENDING_OUTPUT_N_BYTES=$ac_expr" + AC_TRY_COMPILE( + [#include <stdio.h> + ], + [long unsigned int n = $ac_expr;], + fp_done=yes + ) + DEFS=$fp_save_DEFS + test "$fp_done" = yes && break + done + AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES, $ac_expr, + [the number of pending output bytes on stream `fp']) + ]) + fi + + + + + if test $fu_cv_sys_struct_timespec = yes; then + AC_DEFINE_UNQUOTED(HAVE_STRUCT_TIMESPEC, 1, + [Define if struct timespec is declared in <time.h>. ]) + fi +]) |