std::tmpnam

Creates a 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

std::tmpnam modifies static state and is not required to be thread-safe.

Parameters

Return value

filename if filename

Notes

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 (creating a unique directory using only the standard C library still requires the use of tmpnam

POSIX systems additionally define the similarly named function tempnam, which offers the choice of a directory (which defaults to the optionally defined macro P_tmpdir

Example

#include <cstdio>
#include <iostream>
#include <string>
 
int main()
{
    std::string name1 = std::tmpnam(nullptr);
    std::cout << "temporary file name: " << name1 << '\n';
 
    char name2[L_tmpnam];
    if (std::tmpnam(name2))
        std::cout << "temporary file name: " << name2 << '\n';
}

temporary file name: /tmp/fileDjwifs
temporary file name: /tmp/fileEv2bfW

See also