-# pwrite.m4 serial 1
-dnl Copyright (C) 2010 Free Software Foundation, Inc.
+# pwrite.m4 serial 3
+dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_PWRITE],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <unistd.h> to declare pwrite().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_FUNCS_ONCE([pwrite])
- if test $ac_cv_func_pwrite = no; then
+ if test $ac_cv_func_pwrite = yes; then
+ dnl On HP-UX 11.11 with _FILE_OFFSET_BITS=64, pwrite() on a file does not
+ dnl fail when an invalid (negative) offset is passed and uses an arbitrary
+ dnl offset instead of the argument.
+ AC_CACHE_CHECK([whether pwrite works],
+ [gl_cv_func_pwrite_works],
+ [
+ dnl Initial guess, used when cross-compiling.
+changequote(,)dnl
+ case "$host_os" in
+ # Guess no on HP-UX.
+ hpux*) gl_cv_func_pwrite_works="guessing no" ;;
+ # Guess yes otherwise.
+ *) gl_cv_func_pwrite_works="guessing yes" ;;
+ esac
+changequote([,])dnl
+ gl_save_CPPFLAGS="$CPPFLAGS"
+ CPPFLAGS="$CPPFLAGS -D_FILE_OFFSET_BITS=64"
+ rm -f conftest.out
+ AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+ ]],
+ [[
+{
+ /* This test fails on HP-UX 11.00..11.11. */
+ {
+ int fd = open ("conftest.out", O_RDWR | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0)
+ return 1;
+ if (pwrite (fd, "b", 1, (off_t) -1) >= 0)
+ return 2;
+ }
+ /* This test fails on HP-UX 11.00..11.11. */
+ {
+ int fd;
+ char buf[] = "01";
+
+ fd = open ("conftest.out", O_WRONLY | O_CREAT | O_TRUNC, 0600);
+ if (fd < 0)
+ return 3;
+ if (write (fd, buf, 2) < 2)
+ return 4;
+ if (close (fd) < 0)
+ return 5;
+
+ fd = open ("conftest.out", O_WRONLY, 0600);
+ if (fd < 0)
+ return 6;
+ if (pwrite (fd, "W", 1, (off_t) 0) != 1)
+ return 7;
+ if (close (fd) < 0)
+ return 8;
+
+ fd = open ("conftest.out", O_RDONLY);
+ if (fd < 0)
+ return 9;
+ if (read (fd, buf, 2) < 2)
+ return 10;
+ if (close (fd) < 0)
+ return 11;
+ if (buf[0] != 'W')
+ return 12;
+ if (buf[1] != '1')
+ return 13;
+ }
+ return 0;
+}
+
+
+ return 0;
+}]])],
+ [gl_cv_func_pwrite_works=yes],
+ [gl_cv_func_pwrite_works=no],
+ [:])
+ rm -f conftest.out
+ CPPFLAGS="$gl_save_CPPFLAGS"
+ ])
+ case "$gl_cv_func_pwrite_works" in
+ *yes) ;;
+ *) REPLACE_PWRITE=1 ;;
+ esac
+ else
HAVE_PWRITE=0
+ fi
+ if test $HAVE_PWRITE = 0 || test $REPLACE_PWRITE = 1; then
AC_LIBOBJ([pwrite])
fi
])