char *NewName;
for (i = 0; i<5; i++)
{
char tempname[] = "XXXXXX" ;

NewName = mktemp(tempname);
fp = fopen(NewName,"w");
fclose(fp);
}

不懂.

Linux命令：mktemp

功能说明：建立暂存文件。

语　　法：mktemp [-qu][文件名参数]
补充说明：mktemp可建立一个暂存文件，供shell script使用。
参　　数：
-q 　执行时若发生错误，不会显示任何信息。
-u 　暂存文件会在mktemp结束前先行删除。
[文件名参数] 　文件名参数必须是以"自订名称.XXXXXX"的格式。

英文版本，欢迎翻译：

NAME mktemp - make temporary file name (unique)

SYNOPSIS mktemp [-d] [-q] [-u] template

DESCRIPTION The mktemp utility takes the given file name template and overwrites a portion of it to create a file name. This file name is unique and suit? able for use by the application. The template may be any file name with some number of `Xs appended to it, for example /tmp/temp.XXXX. The trailing `Xs are replaced with the current process number and/or a unique letter combination. The number of unique file names mktemp can return depends on the number of `Xs provided; six `Xs will result in mktemp testing roughly 26 ** 6 combinations.

If mktemp can successfully generate a unique file name, the file is cre? ated with mode 0600 (unless the -u flag is given) and the filename is printed to standard output.

OPTIONS The available options are as follows:

-d Make a directory instead of a file.

-q Fail silently if an error occurs. This is useful if a script does not want error output to go to standard error.

-u Operate in ``unsafe' mode. The temp file will be unlinked be? fore mktemp exits. This is slightly better than mktemp(3) but still introduces a race condition. Use of this option is not en? couraged.

RETURN VALUES The mktemp utility exits with a value of 0 on success, and 1 on failure.

EXAMPLES The following sh(1) fragment illustrates a simple use of mktemp where the script should quit if it cannot get a safe temporary file.

TMPFILE=`mktemp /tmp/.XXXXXX` || exit 1 echo "program output" >> $TMPFILE

In this case, we want the script to catch the error itself.

TMPFILE=`mktemp -q /tmp/.XXXXXX` if [ $? -ne 0 ]; then echo ": Cant create temp file, exiting..." exit 1 fi

Note that one can also check to see that $TMPFILE is zero length instead of checking $?. This would allow the check to be done later one in the script (since $? would get clobbered by the next shell command).

SEE ALSO mkstemp(3), mktemp(3)

HISTORY The mktemp utility appeared in OpenBSD.

BSD Experimental November, 20, 1996 1

Retrieved from "http://wiki.chinaunix.net/index.php/Mktemp"

结果是不是建立5个名字唯一的文件?