Difference between revisions of "c/io/tmpnam"
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m (Shorten template names. Use {{lc}} where appropriate.) |
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===Parameters=== | ===Parameters=== | ||
| − | {{ | + | {{par begin}} |
| − | {{ | + | {{par | filename | pointer to the character string to be used as a result buffer. If {{tt|NULL}} is passed, a pointer to an internal static buffer is returned.}} |
| − | {{ | + | {{par end}} |
===Return value=== | ===Return value=== | ||
| − | {{tt|filename}} if {{tt|filename}} was not {{ | + | {{tt|filename}} if {{tt|filename}} was not {{lc|NULL}}. Otherwise a pointer to an internal static buffer is returned. If no suitable filename can be generated, {{lc|NULL}} is returned. |
===Example=== | ===Example=== | ||
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===See also=== | ===See also=== | ||
| − | {{ | + | {{dsc begin}} |
| − | {{ | + | {{dsc inc | c/io/dcl list tmpfile}} |
| − | {{ | + | {{dsc see cpp | cpp/io/c/tmpnam}} |
| − | {{ | + | {{dsc end}} |
[[de:c/io/tmpnam]] | [[de:c/io/tmpnam]] | ||
Revision as of 17:34, 31 May 2013
| 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.
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
| C++ documentation for tmpnam
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