mirror of https://gitee.com/openkylin/wget.git
99 lines
3.0 KiB
Plaintext
99 lines
3.0 KiB
Plaintext
# fclose.m4 serial 11
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dnl Copyright (C) 2008-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN_ONCE([gl_FUNC_FCLOSE],
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[
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AC_REQUIRE([gl_STDIO_H_DEFAULTS])
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AC_REQUIRE([AC_CANONICAL_HOST])
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gl_FUNC_FFLUSH_STDIN
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case "$gl_cv_func_fflush_stdin" in
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*yes) ;;
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*) REPLACE_FCLOSE=1 ;;
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esac
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AC_REQUIRE([gl_FUNC_CLOSE])
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if test $REPLACE_CLOSE = 1; then
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REPLACE_FCLOSE=1
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fi
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case "$host_os" in
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openedition) REPLACE_FCLOSE=1 ;;
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esac
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if test $REPLACE_FCLOSE = 0; then
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gl_FUNC_FCLOSE_STDIN
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case "$gl_cv_func_fclose_stdin" in
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*yes) ;;
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*) REPLACE_FCLOSE=1 ;;
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esac
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fi
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])
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dnl Determine whether fclose works on input streams.
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dnl Sets gl_cv_func_fclose_stdin.
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AC_DEFUN([gl_FUNC_FCLOSE_STDIN],
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[
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AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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AC_CHECK_HEADERS_ONCE([unistd.h])
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AC_CACHE_CHECK([whether fclose works on input streams],
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[gl_cv_func_fclose_stdin],
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[echo hello world > conftest.txt
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AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <fcntl.h>
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#include <stdio.h>
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#else /* on Windows with MSVC */
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# include <io.h>
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#endif
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]GL_MDA_DEFINES],
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[[int fd;
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int fd2;
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FILE *fp;
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fd = open ("conftest.txt", O_RDONLY);
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if (fd < 0)
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return 1;
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if (lseek (fd, 1, SEEK_SET) != 1)
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return 2;
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fd2 = dup (fd);
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if (fd2 < 0)
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return 3;
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fp = fdopen (fd2, "r");
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if (fp == NULL)
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return 4;
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if (fgetc (fp) != 'e')
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{ fclose (fp); return 5; }
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/* This fclose() call should reposition the underlying file
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descriptor. */
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if (fclose (fp) != 0)
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return 6;
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if (lseek (fd2, 0, SEEK_CUR) != -1) /* should fail with EBADF */
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return 7;
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/* Verify the file position. */
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if (lseek (fd, 0, SEEK_CUR) != 2)
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return 8;
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return 0;
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]])],
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[gl_cv_func_fclose_stdin=yes],
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[gl_cv_func_fclose_stdin=no],
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[case "$host_os" in
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# Guess no on glibc systems.
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*-gnu* | gnu*) gl_cv_func_fclose_stdin="guessing no" ;;
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# Guess yes on musl systems.
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*-musl* | midipix*) gl_cv_func_fclose_stdin="guessing yes" ;;
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# Guess no on native Windows.
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mingw*) gl_cv_func_fclose_stdin="guessing no" ;;
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# If we don't know, obey --enable-cross-guesses.
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*) gl_cv_func_fclose_stdin="$gl_cross_guess_normal" ;;
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esac
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])
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rm conftest.txt
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])
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])
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