diff options
Diffstat (limited to 'gl/m4/fcntl_h.m4')
| -rw-r--r-- | gl/m4/fcntl_h.m4 | 93 |
1 files changed, 20 insertions, 73 deletions
diff --git a/gl/m4/fcntl_h.m4 b/gl/m4/fcntl_h.m4 index 1ae0b15a..e41915c3 100644 --- a/gl/m4/fcntl_h.m4 +++ b/gl/m4/fcntl_h.m4 @@ -1,5 +1,6 @@ +# serial 12 # Configure fcntl.h. -dnl Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc. +dnl Copyright (C) 2006, 2007, 2009, 2010 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. @@ -9,88 +10,34 @@ dnl Written by Paul Eggert. AC_DEFUN([gl_FCNTL_H], [ AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) - dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW. - AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) - AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h], - [AC_RUN_IFELSE( - [AC_LANG_PROGRAM( - [[#include <sys/types.h> - #include <sys/stat.h> - #include <unistd.h> - #include <fcntl.h> - #ifndef O_NOATIME - #define O_NOATIME 0 - #endif - #ifndef O_NOFOLLOW - #define O_NOFOLLOW 0 - #endif - static int const constants[] = - { - O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND, - O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY - }; - ]], - [[ - int status = !constants; - { - static char const sym[] = "conftest.sym"; - if (symlink (".", sym) != 0 - || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0) - status |= 32; - } - { - static char const file[] = "confdefs.h"; - int fd = open (file, O_RDONLY | O_NOATIME); - char c; - struct stat st0, st1; - if (fd < 0 - || fstat (fd, &st0) != 0 - || sleep (1) != 0 - || read (fd, &c, 1) != 1 - || close (fd) != 0 - || stat (file, &st1) != 0 - || st0.st_atime != st1.st_atime) - status |= 64; - } - return status;]])], - [gl_cv_header_working_fcntl_h=yes], - [case $? in #( - 32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #( - 64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #( - 96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #( - *) gl_cv_header_working_fcntl_h='no';; - esac], - [gl_cv_header_working_fcntl_h=cross-compiling])]) - - case $gl_cv_header_working_fcntl_h in #( - *O_NOATIME* | no | cross-compiling) ac_val=0;; #( - *) ac_val=1;; - esac - AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val], - [Define to 1 if O_NOATIME works.]) - - case $gl_cv_header_working_fcntl_h in #( - *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #( - *) ac_val=1;; - esac - AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val], - [Define to 1 if O_NOFOLLOW works.]) - + AC_REQUIRE([gl_FCNTL_O_FLAGS]) gl_CHECK_NEXT_HEADERS([fcntl.h]) - FCNTL_H='fcntl.h' - AC_SUBST([FCNTL_H]) + + dnl Check for declarations of anything we want to poison if the + dnl corresponding gnulib module is not in use, if it is not common + dnl enough to be declared everywhere. + gl_WARN_ON_USE_PREPARE([[#include <fcntl.h> + ]], [fcntl openat]) ]) AC_DEFUN([gl_FCNTL_MODULE_INDICATOR], [ dnl Use AC_REQUIRE here, so that the default settings are expanded once only. AC_REQUIRE([gl_FCNTL_H_DEFAULTS]) - GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1 + gl_MODULE_INDICATOR_SET_VARIABLE([$1]) + dnl Define it also as a C macro, for the benefit of the unit tests. + gl_MODULE_INDICATOR_FOR_TESTS([$1]) ]) AC_DEFUN([gl_FCNTL_H_DEFAULTS], [ - GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN]) + GNULIB_FCNTL=0; AC_SUBST([GNULIB_FCNTL]) + GNULIB_OPEN=0; AC_SUBST([GNULIB_OPEN]) + GNULIB_OPENAT=0; AC_SUBST([GNULIB_OPENAT]) dnl Assume proper GNU behavior unless another module says otherwise. - REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN]) + HAVE_FCNTL=1; AC_SUBST([HAVE_FCNTL]) + HAVE_OPENAT=1; AC_SUBST([HAVE_OPENAT]) + REPLACE_FCNTL=0; AC_SUBST([REPLACE_FCNTL]) + REPLACE_OPEN=0; AC_SUBST([REPLACE_OPEN]) + REPLACE_OPENAT=0; AC_SUBST([REPLACE_OPENAT]) ]) |