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Annotation of embedaddon/libiconv/m4/fcntl-o.m4, revision 1.1

1.1     ! misho       1: # fcntl-o.m4 serial 1
        !             2: dnl Copyright (C) 2006, 2009-2010 Free Software Foundation, Inc.
        !             3: dnl This file is free software; the Free Software Foundation
        !             4: dnl gives unlimited permission to copy and/or distribute it,
        !             5: dnl with or without modifications, as long as this notice is preserved.
        !             6: 
        !             7: dnl Written by Paul Eggert.
        !             8: 
        !             9: # Test whether the flags O_NOATIME and O_NOFOLLOW actually work.
        !            10: # Define HAVE_WORKING_O_NOATIME to 1 if O_NOATIME works, or to 0 otherwise.
        !            11: # Define HAVE_WORKING_O_NOFOLLOW to 1 if O_NOFOLLOW works, or to 0 otherwise.
        !            12: AC_DEFUN([gl_FCNTL_O_FLAGS],
        !            13: [
        !            14:   dnl Persuade glibc <fcntl.h> to define O_NOATIME and O_NOFOLLOW.
        !            15:   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
        !            16:   AC_CACHE_CHECK([for working fcntl.h], [gl_cv_header_working_fcntl_h],
        !            17:     [AC_RUN_IFELSE(
        !            18:        [AC_LANG_PROGRAM(
        !            19:           [[#include <sys/types.h>
        !            20:            #include <sys/stat.h>
        !            21:            #include <unistd.h>
        !            22:            #include <fcntl.h>
        !            23:            #ifndef O_NOATIME
        !            24:             #define O_NOATIME 0
        !            25:            #endif
        !            26:            #ifndef O_NOFOLLOW
        !            27:             #define O_NOFOLLOW 0
        !            28:            #endif
        !            29:            static int const constants[] =
        !            30:             {
        !            31:               O_CREAT, O_EXCL, O_NOCTTY, O_TRUNC, O_APPEND,
        !            32:               O_NONBLOCK, O_SYNC, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY
        !            33:             };
        !            34:           ]],
        !            35:           [[
        !            36:             int status = !constants;
        !            37:             {
        !            38:               static char const sym[] = "conftest.sym";
        !            39:               if (symlink (".", sym) != 0
        !            40:                   || close (open (sym, O_RDONLY | O_NOFOLLOW)) == 0)
        !            41:                 status |= 32;
        !            42:               unlink (sym);
        !            43:             }
        !            44:             {
        !            45:               static char const file[] = "confdefs.h";
        !            46:               int fd = open (file, O_RDONLY | O_NOATIME);
        !            47:               char c;
        !            48:               struct stat st0, st1;
        !            49:               if (fd < 0
        !            50:                   || fstat (fd, &st0) != 0
        !            51:                   || sleep (1) != 0
        !            52:                   || read (fd, &c, 1) != 1
        !            53:                   || close (fd) != 0
        !            54:                   || stat (file, &st1) != 0
        !            55:                   || st0.st_atime != st1.st_atime)
        !            56:                 status |= 64;
        !            57:             }
        !            58:             return status;]])],
        !            59:        [gl_cv_header_working_fcntl_h=yes],
        !            60:        [case $? in #(
        !            61:         32) gl_cv_header_working_fcntl_h='no (bad O_NOFOLLOW)';; #(
        !            62:         64) gl_cv_header_working_fcntl_h='no (bad O_NOATIME)';; #(
        !            63:         96) gl_cv_header_working_fcntl_h='no (bad O_NOATIME, O_NOFOLLOW)';; #(
        !            64:          *) gl_cv_header_working_fcntl_h='no';;
        !            65:         esac],
        !            66:        [gl_cv_header_working_fcntl_h=cross-compiling])])
        !            67: 
        !            68:   case $gl_cv_header_working_fcntl_h in #(
        !            69:   *O_NOATIME* | no | cross-compiling) ac_val=0;; #(
        !            70:   *) ac_val=1;;
        !            71:   esac
        !            72:   AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOATIME], [$ac_val],
        !            73:     [Define to 1 if O_NOATIME works.])
        !            74: 
        !            75:   case $gl_cv_header_working_fcntl_h in #(
        !            76:   *O_NOFOLLOW* | no | cross-compiling) ac_val=0;; #(
        !            77:   *) ac_val=1;;
        !            78:   esac
        !            79:   AC_DEFINE_UNQUOTED([HAVE_WORKING_O_NOFOLLOW], [$ac_val],
        !            80:     [Define to 1 if O_NOFOLLOW works.])
        !            81: ])