Defined in header
char* tmpnam( char* filename );
Creates an unique filename that does not name a currently existing file, and stores it in the character string pointed to by
filename. The function is capable of generating up to TMP_MAX of unique filenames, but some or all of them may already be in use, and thus not suitable return values.
|filename||-|| pointer to the character array capable of holding at least L_tmpnam bytes, to be used as a result buffer. If |
When called with null pointer argument, this function modifies a global object. If another thread calls
std::tmpnam with null pointer argument at the same time, the behavior is undefined due to a data race.
Although the names generated by
std::tmpnam are difficult to guess, it is possible that a file with that name is created by another process between the moment
std::tmpnam returns and the moment this program attempts to use the returned name to create a file. The standard function std::tmpfile and the POSIX function mkstemp do not have this problem.
temporary file name: /tmp/fileDjwifs temporary file name: /tmp/fileEv2bfW
C documentation for tmpnam