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-rw-r--r--m4/pselect.m431
1 files changed, 31 insertions, 0 deletions
diff --git a/m4/pselect.m4 b/m4/pselect.m4
new file mode 100644
index 0000000000..97bf12cd2d
--- /dev/null
+++ b/m4/pselect.m4
@@ -0,0 +1,31 @@
+# pselect.m4
+dnl Copyright (C) 2011-2012 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_PSELECT],
+[
+ AC_REQUIRE([gl_HEADER_SYS_SELECT])
+ AC_REQUIRE([AC_C_RESTRICT])
+ AC_CHECK_FUNCS_ONCE([pselect])
+
+ if test $ac_cv_func_pselect = yes; then
+ AC_CACHE_CHECK([whether signature of pselect conforms to POSIX],
+ gl_cv_sig_pselect,
+ [AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <sys/select.h>
+ ]],
+ [[int (*p) (int, fd_set *, fd_set *, fd_set *restrict,
+ struct timespec const *restrict,
+ sigset_t const *restrict) = pselect;
+ return !p;]])],
+ [gl_cv_sig_pselect=yes],
+ [gl_cv_sig_pselect=no])])
+ fi
+
+ if test $ac_cv_func_pselect = no || test $gl_cv_sig_pselect = no; then
+ REPLACE_PSELECT=1
+ fi
+])