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- #serial 13
- # Copyright (C) 2005-2007, 2009-2021 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 $ac_cv_func_getlogin_r = no; then
- HAVE_GETLOGIN_R=0
- else
- HAVE_GETLOGIN_R=1
- dnl On Mac OS X 10.13 and OSF/1 5.1, getlogin_r returns a truncated result
- dnl if the buffer is not large enough.
- AC_REQUIRE([AC_CANONICAL_HOST])
- AC_CACHE_CHECK([whether getlogin_r works with small buffers],
- [gl_cv_func_getlogin_r_works],
- [
- dnl Initial guess, used when cross-compiling.
- changequote(,)dnl
- case "$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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