Mercurial > gnulib

view m4/open-cloexec.m4 @ 40214:452ab00796c7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix undefined behaviour. * lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to 'unsigned int', to avoid shift operations on 'int'. * lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size. * tests/test-count-leading-zeros.c (main): Use a random number that has as many bits as TYPE, not only 2*15 or 2*31 bits. * tests/test-count-trailing-zeros.c (main): Likewise. * tests/test-count-one-bits.c (main): Likewise. * tests/test-memmem.c: Don't include "null-ptr.h". (main): Use zerosize_ptr() instead of null_ptr(). * modules/memmem-tests (Files): Remove tests/null-ptr.h.
author Bruno Haible <bruno@clisp.org>
date Sat, 09 Mar 2019 20:32:25 +0100
parents b06060465f09
children
line wrap: on
line source

# Test whether O_CLOEXEC is defined.

dnl Copyright 2017-2019 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_PREPROC_O_CLOEXEC],
[
  AC_CACHE_CHECK([for O_CLOEXEC],
    [gl_cv_macro_O_CLOEXEC],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([[#include <fcntl.h>
                          #ifndef O_CLOEXEC
                            choke me;
                          #endif
                        ]],
                        [[return O_CLOEXEC;]])],
       [gl_cv_macro_O_CLOEXEC=yes],
       [gl_cv_macro_O_CLOEXEC=no])])
])