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# pwrite.m4 serial 8
dnl Copyright (C) 2010-2023 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])
gl_CHECK_FUNCS_ANDROID([pwrite], [[#include <unistd.h>]])
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>
]GL_MDA_DEFINES],
[[
{
/* 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;
}]])],
[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
case "$gl_cv_onwards_func_pwrite" in
future*) REPLACE_PWRITE=1 ;;
esac
fi
])
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