tmpfile

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C Standard Library headers

assert.h complex.h ctype.h errno.h fenv.h float.h inttypes.h iso646.h limits.h locale.h math.h setjmp.h signal.h stdarg.h stdbool.h stddef.h stdint.h stdio.h stdlib.h string.h tgmath.h time.h wchar.h wctype.h

The ISO C/POSIX function tmpfile allows C/C++ programmers to create a temporary file, a special type of computer file which ceases to exist once it has been closed.

Contents 1 Security Issues 2 Usage 2.1 Inclusion 2.2 Declaration 2.3 Semantics 3 See Also 4 References

[edit] Security Issues

The tmpfile function is susceptible to a number of security vulnerabilities; the UNIX function mkstemp, which performs a similar function, is less vulnerable to attack.

[edit] Usage

[edit] Inclusion

C

#include <stdio.h>

C++

#include <cstdio>

[edit] Declaration

FILE* tmpfile(void);

[edit] Semantics

The function tmpfile reports a pointer to a valid file stream on success; on failure, it returns NULL.

[edit] See Also

• mktemp
• mkstemp
• fopen
• fclose
• stdio.h

[edit] References

1. tmpfile by OpenGroup
2. tmpfile by HMUG
3. Temporary Files by GNU C Library
4. Insecure Temporary File by Fortify Software