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annotate m4/pwrite.m4 @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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1 # pwrite.m4 serial 5
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2 dnl Copyright (C) 2010-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_PWRITE],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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11
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12 dnl Persuade glibc <unistd.h> to declare pwrite().
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13 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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14
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15 AC_CHECK_FUNCS_ONCE([pwrite])
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16 if test $ac_cv_func_pwrite = yes; then
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17 dnl On HP-UX 11.11 with _FILE_OFFSET_BITS=64, pwrite() on a file does not
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18 dnl fail when an invalid (negative) offset is passed and uses an arbitrary
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19 dnl offset instead of the argument.
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20 AC_CACHE_CHECK([whether pwrite works],
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21 [gl_cv_func_pwrite_works],
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22 [
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23 dnl Initial guess, used when cross-compiling.
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24 changequote(,)dnl
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25 case "$host_os" in
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26 # Guess no on HP-UX.
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27 hpux*) gl_cv_func_pwrite_works="guessing no" ;;
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28 # Guess yes otherwise.
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29 *) gl_cv_func_pwrite_works="guessing yes" ;;
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30 esac
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31 changequote([,])dnl
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32 gl_save_CPPFLAGS="$CPPFLAGS"
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33 CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
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34 rm -f conftest.out
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35 AC_RUN_IFELSE(
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36 [AC_LANG_PROGRAM([[
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37 #include <sys/types.h>
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38 #include <unistd.h>
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39 #include <fcntl.h>
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40 ]],
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41 [[
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42 {
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43 /* This test fails on HP-UX 11.00..11.11. */
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44 {
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45 int fd = open ("conftest.out", O_RDWR | O_CREAT | O_TRUNC, 0600);
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46 if (fd < 0)
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47 return 1;
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48 if (pwrite (fd, "b", 1, (off_t) -1) >= 0)
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49 return 2;
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50 }
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51 /* This test fails on HP-UX 11.00..11.11. */
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52 {
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53 int fd;
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54 char buf[] = "01";
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55
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56 fd = open ("conftest.out", O_WRONLY | O_CREAT | O_TRUNC, 0600);
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57 if (fd < 0)
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58 return 3;
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59 if (write (fd, buf, 2) < 2)
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60 return 4;
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61 if (close (fd) < 0)
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62 return 5;
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63
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64 fd = open ("conftest.out", O_WRONLY, 0600);
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65 if (fd < 0)
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66 return 6;
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67 if (pwrite (fd, "W", 1, (off_t) 0) != 1)
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68 return 7;
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69 if (close (fd) < 0)
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70 return 8;
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71
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72 fd = open ("conftest.out", O_RDONLY);
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73 if (fd < 0)
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74 return 9;
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75 if (read (fd, buf, 2) < 2)
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76 return 10;
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77 if (close (fd) < 0)
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78 return 11;
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79 if (buf[0] != 'W')
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80 return 12;
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81 if (buf[1] != '1')
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82 return 13;
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83 }
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84 return 0;
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85 }]])],
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86 [gl_cv_func_pwrite_works=yes],
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87 [gl_cv_func_pwrite_works=no],
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88 [:])
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89 rm -f conftest.out
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90 CPPFLAGS="$gl_save_CPPFLAGS"
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91 ])
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92 case "$gl_cv_func_pwrite_works" in
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93 *yes) ;;
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94 *) REPLACE_PWRITE=1 ;;
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95 esac
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96 else
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97 HAVE_PWRITE=0
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98 fi
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99 ])