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annotate m4/getlogin_r.m4 @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #serial 12
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2
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3 # Copyright (C) 2005-2007, 2009-2019 Free Software Foundation, Inc.
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4 #
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5 # This file is free software; the Free Software Foundation
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6 # gives unlimited permission to copy and/or distribute it,
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7 # with or without modifications, as long as this notice is preserved.
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8
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9 dnl From Derek Price
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11 dnl Provide getlogin_r when the system lacks it.
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13
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14 AC_DEFUN([gl_FUNC_GETLOGIN_R],
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15 [
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16 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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17
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18 dnl Persuade glibc <unistd.h> to declare getlogin_r().
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19 dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
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20 dnl getlogin_r().
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21 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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22
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23 AC_CHECK_DECLS_ONCE([getlogin_r])
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24 if test $ac_cv_have_decl_getlogin_r = no; then
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25 HAVE_DECL_GETLOGIN_R=0
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26 fi
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27
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28 AC_CHECK_FUNCS_ONCE([getlogin_r])
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29 if test $ac_cv_func_getlogin_r = no; then
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30 HAVE_GETLOGIN_R=0
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31 else
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32 HAVE_GETLOGIN_R=1
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33 dnl On Mac OS X 10.12 and OSF/1 5.1, getlogin_r returns a truncated result
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34 dnl if the buffer is not large enough.
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35 AC_REQUIRE([AC_CANONICAL_HOST])
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36 AC_CACHE_CHECK([whether getlogin_r works with small buffers],
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37 [gl_cv_func_getlogin_r_works],
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38 [
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39 dnl Initial guess, used when cross-compiling.
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40 changequote(,)dnl
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41 case "$host_os" in
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42 # Guess no on Mac OS X, OSF/1.
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43 darwin* | osf*) gl_cv_func_getlogin_r_works="guessing no" ;;
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44 # Guess yes otherwise.
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45 *) gl_cv_func_getlogin_r_works="guessing yes" ;;
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46 esac
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47 changequote([,])dnl
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48 AC_RUN_IFELSE(
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49 [AC_LANG_SOURCE([[
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50 #include <stddef.h>
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51 #include <string.h>
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52 #include <unistd.h>
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53 #if !HAVE_DECL_GETLOGIN_R
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54 extern
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55 # ifdef __cplusplus
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56 "C"
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57 # endif
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58 int getlogin_r (char *, size_t);
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59 #endif
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60 int
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61 main (void)
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62 {
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63 int result = 0;
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64 char buf[100];
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65
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66 if (getlogin_r (buf, 0) == 0)
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67 result |= 1;
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68 if (getlogin_r (buf, 1) == 0)
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69 result |= 2;
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70 if (getlogin_r (buf, 100) == 0)
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71 {
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72 size_t n = strlen (buf);
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73 if (getlogin_r (buf, n) == 0)
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74 result |= 4;
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75 }
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76 return result;
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77 }]])],
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78 [gl_cv_func_getlogin_r_works=yes],
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79 [gl_cv_func_getlogin_r_works=no],
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80 [:])
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81 ])
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82 case "$gl_cv_func_getlogin_r_works" in
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83 *yes) ;;
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84 *) REPLACE_GETLOGIN_R=1 ;;
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85 esac
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86 fi
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87 ])
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88
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89 AC_DEFUN([gl_PREREQ_GETLOGIN_R],
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90 [
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91 AC_CHECK_DECLS_ONCE([getlogin])
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92 ])