#serial 23

# Copyright (C) 2001, 2003-2007, 2009-2017 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.

# On some hosts (e.g., HP-UX 10.20, SunOS 4.1.4, Solaris 2.5.1), mkstemp has a

# silly limit that it can create no more than 26 files from a given template.

# Other systems lack mkstemp altogether.

# On OSF1/Tru64 V4.0F, the system-provided mkstemp function can create

# only 32 files per process.

# On some hosts, mkstemp creates files with mode 0666, which is a security

# problem and a violation of POSIX 2008.

# On systems like the above, arrange to use the replacement function.

AC_DEFUN([gl_FUNC_MKSTEMP],

[

  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CHECK_FUNCS_ONCE([mkstemp])

  if test $ac_cv_func_mkstemp = yes; then

    AC_CACHE_CHECK([for working mkstemp],

      [gl_cv_func_working_mkstemp],

      [

        mkdir conftest.mkstemp

        AC_RUN_IFELSE(

          [AC_LANG_PROGRAM(

            [AC_INCLUDES_DEFAULT],

            [[int result = 0;

              int i;

              off_t large = (off_t) 4294967295u;

              if (large < 0)

                large = 2147483647;

              umask (0);

              for (i = 0; i < 70; i++)

                {

                  char templ[] = "conftest.mkstemp/coXXXXXX";

                  int (*mkstemp_function) (char *) = mkstemp;

                  int fd = mkstemp_function (templ);

                  if (fd < 0)

                    result |= 1;

                  else

                    {

                      struct stat st;

                      if (lseek (fd, large, SEEK_SET) != large)

                        result |= 2;

                      if (fstat (fd, &st) < 0)

                        result |= 4;

                      else if (st.st_mode & 0077)

                        result |= 8;

                      if (close (fd))

                        result |= 16;

                    }

                }

              return result;]])],

          [gl_cv_func_working_mkstemp=yes],

          [gl_cv_func_working_mkstemp=no],

          [case "$host_os" in

                     # Guess yes on glibc systems.

             *-gnu*) gl_cv_func_working_mkstemp="guessing yes" ;;

                     # If we don't know, assume the worst.

             *)      gl_cv_func_working_mkstemp="guessing no" ;;

           esac

          ])

        rm -rf conftest.mkstemp

      ])

    case "$gl_cv_func_working_mkstemp" in

      *yes) ;;

      *)

        REPLACE_MKSTEMP=1

        ;;

    esac

  else

    HAVE_MKSTEMP=0

  fi

])

# Prerequisites of lib/mkstemp.c.

AC_DEFUN([gl_PREREQ_MKSTEMP],

[

])