Namespace
Varianti

std::tmpnam

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tmpnam
 
Defined in header <cstdio>
char* tmpnam( char* filename );
Crea un nome di file univoco che non il nome di un file attualmente esistenti, e lo memorizza nella stringa di caratteri puntata da filename. La funzione è in grado di generare fino a TMP_MAX di nomi di file unici, ma alcuni o tutti loro potrebbero essere già in uso, e quindi non idonei valori di ritorno.
Original:
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.
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Indice

[modifica] Parametri

filename -
puntatore alla matrice di caratteri in grado di contenere al byte meno L_tmpnam, per essere usato come un tampone risultato. Se NULL è passato, un puntatore a un buffer interno statico viene restituito .
Original:
pointer to the character array capable of holding at least L_tmpnam bytes, to be used as a result buffer. If NULL is passed, a pointer to an internal static buffer is returned.
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[modifica] Valore di ritorno

filename filename se non fosse NULL. In caso contrario, un puntatore a un buffer interno statico viene restituito. Se non filename adatto può essere generato, viene restituito NULL.
Original:
filename if filename was not NULL. Otherwise a pointer to an internal static buffer is returned. If no suitable filename can be generated, NULL is returned.
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[modifica] Note

Quando viene chiamato con l'argomento puntatore nullo, questa funzione modifica un oggetto globale. Se un altro thread chiama std::tmpnam con argomento puntatore nullo, allo stesso tempo, il comportamento è indefinito a causa di una gara di dati.
Original:
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.
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Anche se i nomi generati da std::tmpnam sono difficili da indovinare, è possibile che un file con quel nome è stato creato da un altro processo tra i rendimenti std::tmpnam il momento e il momento questo programma tenta di utilizzare il nome restituito per creare un file. La std::tmpfile funzione standard e la funzione POSIX mkstemp non hanno questo problema.
Original:
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.
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[modifica] Esempio

#include <iostream>
#include <cstdio>
#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';
}

Possible output:

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

[modifica] Vedi anche

crea e apre un temporaneo, auto-rimozione di file
Original:
creates and opens a temporary, auto-removing file
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(funzione) [edit]
C documentation for tmpnam