diff options
Diffstat (limited to 'm4/freopen.m4')
| -rw-r--r-- | m4/freopen.m4 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/m4/freopen.m4 b/m4/freopen.m4 new file mode 100644 index 0000000..5038a98 --- /dev/null +++ b/m4/freopen.m4 @@ -0,0 +1,40 @@ +# freopen.m4 serial 6 +dnl Copyright (C) 2007-2018 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_FREOPEN], +[ + AC_REQUIRE([gl_STDIO_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) + case "$host_os" in + mingw* | pw* | os2*) + REPLACE_FREOPEN=1 + ;; + *) + AC_CACHE_CHECK([whether freopen works on closed fds], + [gl_cv_func_freopen_works_on_closed], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdio.h> + #include <unistd.h> + ]], + [[close (0); + return !(freopen ("/dev/null", "r", stdin) + && getchar () == EOF + && !ferror (stdin) && feof (stdin));]])], + [gl_cv_func_freopen_works_on_closed=yes], + [gl_cv_func_freopen_works_on_closed=no], + [case $host_os in + *gnu*) gl_cv_func_freopen_works_on_closed="guessing no" ;; + *) gl_cv_func_freopen_works_on_closed="guessing yes";; + esac])]) + case $gl_cv_func_freopen_works_on_closed in + *no) REPLACE_FREOPEN=1;; + esac + esac +]) + +# Prerequisites of lib/freopen.c. +AC_DEFUN([gl_PREREQ_FREOPEN], [:]) |