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# serial 9
# See if we need to provide mkfifo replacement.
dnl Copyright (C) 2009-2022 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.
# Written by Eric Blake.
AC_DEFUN([gl_FUNC_MKFIFO],
[
AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl We can't use AC_CHECK_FUNC here, because mkfifo() is defined as a
dnl static inline function when compiling for Android 4.4 or older.
AC_CACHE_CHECK([for mkfifo], [gl_cv_func_mkfifo],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/stat.h>]],
[[return mkfifo("/",0);]])
],
[gl_cv_func_mkfifo=yes],
[gl_cv_func_mkfifo=no])
])
if test $gl_cv_func_mkfifo = no; then
HAVE_MKFIFO=0
else
AC_DEFINE([HAVE_MKFIFO], [1],
[Define to 1 if you have a 'mkfifo' function.])
dnl Check for Solaris 9 and FreeBSD bug with trailing slash.
AC_CHECK_FUNCS_ONCE([lstat])
AC_CACHE_CHECK([whether mkfifo rejects trailing slashes],
[gl_cv_func_mkfifo_works],
[# Assume that if we have lstat, we can also check symlinks.
if test $ac_cv_func_lstat = yes; then
ln -s conftest.tmp conftest.lnk
fi
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <sys/stat.h>
]],
[[int result = 0;
if (!mkfifo ("conftest.tmp/", 0600))
result |= 1;
#if HAVE_LSTAT
if (!mkfifo ("conftest.lnk/", 0600))
result |= 2;
#endif
return result;
]])],
[gl_cv_func_mkfifo_works=yes], [gl_cv_func_mkfifo_works=no],
[case "$host_os" in
# Guess yes on Linux systems.
linux-* | linux) gl_cv_func_mkfifo_works="guessing yes" ;;
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_mkfifo_works="guessing yes" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_mkfifo_works="$gl_cross_guess_normal" ;;
esac
])
rm -f conftest.tmp conftest.lnk])
case "$gl_cv_func_mkfifo_works" in
*yes) ;;
*)
AC_DEFINE([MKFIFO_TRAILING_SLASH_BUG], [1], [Define to 1 if mkfifo
does not reject trailing slash])
REPLACE_MKFIFO=1
;;
esac
fi
])
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