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.
tmpnam is not reentrant and thus not thread-safe.
Contents |
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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