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# fclose.m4 serial 10
dnl Copyright (C) 2008-2023 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_FCLOSE],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST])
gl_FUNC_FFLUSH_STDIN
case "$gl_cv_func_fflush_stdin" in
*yes) ;;
*) REPLACE_FCLOSE=1 ;;
esac
AC_REQUIRE([gl_FUNC_CLOSE])
if test $REPLACE_CLOSE = 1; then
REPLACE_FCLOSE=1
fi
case "$host_os" in
openedition) REPLACE_FCLOSE=1 ;;
esac
if test $REPLACE_FCLOSE = 0; then
gl_FUNC_FCLOSE_STDIN
case "$gl_cv_func_fclose_stdin" in
*yes) ;;
*) REPLACE_FCLOSE=1 ;;
esac
fi
])
dnl Determine whether fclose works on input streams.
dnl Sets gl_cv_func_fclose_stdin.
AC_DEFUN([gl_FUNC_FCLOSE_STDIN],
[
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_HEADERS_ONCE([unistd.h])
AC_CACHE_CHECK([whether fclose works on input streams],
[gl_cv_func_fclose_stdin],
[echo hello world > conftest.txt
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <fcntl.h>
#include <stdio.h>
#if HAVE_UNISTD_H
# include <unistd.h>
#else /* on Windows with MSVC */
# include <io.h>
#endif
]GL_MDA_DEFINES],
[[int fd;
int fd2;
FILE *fp;
fd = open ("conftest.txt", O_RDONLY);
if (fd < 0)
return 1;
if (lseek (fd, 1, SEEK_SET) != 1)
return 2;
fd2 = dup (fd);
if (fd2 < 0)
return 3;
fp = fdopen (fd2, "r");
if (fp == NULL)
return 4;
if (fgetc (fp) != 'e')
{ fclose (fp); return 5; }
/* This fclose() call should reposition the underlying file
descriptor. */
if (fclose (fp) != 0)
return 6;
if (lseek (fd2, 0, SEEK_CUR) != -1) /* should fail with EBADF */
return 7;
/* Verify the file position. */
if (lseek (fd, 0, SEEK_CUR) != 2)
return 8;
return 0;
]])],
[gl_cv_func_fclose_stdin=yes],
[gl_cv_func_fclose_stdin=no],
[case "$host_os" in
# Guess no on glibc systems.
*-gnu* | gnu*) gl_cv_func_fclose_stdin="guessing no" ;;
# Guess yes on musl systems.
*-musl* | midipix*) gl_cv_func_fclose_stdin="guessing yes" ;;
# Guess no on native Windows.
mingw*) gl_cv_func_fclose_stdin="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_fclose_stdin="$gl_cross_guess_normal" ;;
esac
])
rm conftest.txt
])
])
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