tmpnam
From cppreference.com
| Defined in header <stdio.h>
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| char *tmpnam( char *filename ); |
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Creates an unique filename and stores it in 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 be in use in the filesystem and thus not suitable return values.
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Parameters
| filename | - | pointer to the character string to be used as a result buffer. If NULL is passed, a pointer to an internal static buffer is returned.
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Return value
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.
Example
Run this code
#include <stdlib.h> #include <stdio.h> #include <stdint.h> #include <stdbool.h> int main(int argc, char *argv[]) { printf("Welcome to %s\n", argv[0]); printf("Called with %u arguments\n", argc - 1); char buffer[L_tmpnam] = {'\0'}; tmpnam(buffer); printf(buffer); printf("\n"); printf("Goodbye!\n"); exit(EXIT_SUCCESS); }
Output:
Welcome to ./main_release Called with 0 arguments /tmp/file6HADua Goodbye!
See also
| (C11) |
returns a pointer to a temporary file (function) |
| C++ documentation for tmpnam
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