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#serial 12
# Copyright (C) 2005-2007, 2009-2020 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
dnl From Derek Price
dnl
dnl Provide getlogin_r when the system lacks it.
dnl
AC_DEFUN([gl_FUNC_GETLOGIN_R],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl Persuade glibc <unistd.h> to declare getlogin_r().
dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of
dnl getlogin_r().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([getlogin_r])
if test $ac_cv_have_decl_getlogin_r = no; then
HAVE_DECL_GETLOGIN_R=0
fi
AC_CHECK_FUNCS_ONCE([getlogin_r])
if test $ac_cv_func_getlogin_r = no; then
HAVE_GETLOGIN_R=0
else
HAVE_GETLOGIN_R=1
dnl On Mac OS X 10.12 and OSF/1 5.1, getlogin_r returns a truncated result
dnl if the buffer is not large enough.
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_CHECK([whether getlogin_r works with small buffers],
[gl_cv_func_getlogin_r_works],
[
dnl Initial guess, used when cross-compiling.
changequote(,)dnl
case "$host_os" in
# Guess no on Mac OS X, OSF/1.
darwin* | osf*) gl_cv_func_getlogin_r_works="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_getlogin_r_works="guessing yes" ;;
esac
changequote([,])dnl
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#if !HAVE_DECL_GETLOGIN_R
extern
# ifdef __cplusplus
"C"
# endif
int getlogin_r (char *, size_t);
#endif
int
main (void)
{
int result = 0;
char buf[100];
if (getlogin_r (buf, 0) == 0)
result |= 1;
if (getlogin_r (buf, 1) == 0)
result |= 2;
if (getlogin_r (buf, 100) == 0)
{
size_t n = strlen (buf);
if (getlogin_r (buf, n) == 0)
result |= 4;
}
return result;
}]])],
[gl_cv_func_getlogin_r_works=yes],
[gl_cv_func_getlogin_r_works=no],
[:])
])
case "$gl_cv_func_getlogin_r_works" in
*yes) ;;
*) REPLACE_GETLOGIN_R=1 ;;
esac
fi
])
AC_DEFUN([gl_PREREQ_GETLOGIN_R],
[
AC_CHECK_DECLS_ONCE([getlogin])
])
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