mktemp - make a unique temporary filename

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ mktemp()                                                                    │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       Never use mktemp().  Some implementations follow 4.3BSD and replace XXXXXX by the current process ID  and
       a single letter, so that at most 26 different names can be returned.  Since on the one hand the names are
       easy  to guess, and on the other hand there is a race between testing whether the name exists and opening
       the file, every use of mktemp() is a security risk.  The race is avoided by mkstemp(3) and mkdtemp(3).

Neverusethisfunction; see BUGS.

       The  mktemp()  function  generates a unique temporary filename from template.  The last six characters of
       template must be XXXXXX and these are replaced with a string that makes the filename  unique.   Since  it
       will be modified, template must not be a string constant, but should be declared as a character array.

EINVAL The last six characters of template were not XXXXXX.

       4.3BSD, POSIX.1-2001.  Removed in POSIX.1-2008.

       Standard C library (libc, -lc)

       mktemp - make a unique temporary filename

       The  mktemp()  function  always  returns  template.   If a unique name was created, the last six bytes of
       template will have been modified in such a way that the resulting name is unique (i.e.,  does  not  exist
       already)  If  a  unique  name could not be created, template is made an empty string, and errno is set to
       indicate the error.

mktemp(1), mkdtemp(3), mkstemp(3), tempnam(3), tmpfile(3), tmpnam(3)

Linux man-pages 6.9.1                              2024-05-02                                          mktemp(3)

       None.

#include<stdlib.h>char*mktemp(char*template);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       mktemp():
           Since glibc 2.12:
               (_XOPEN_SOURCE >= 500) && ! (_POSIX_C_SOURCE >= 200112L)
                   || /* glibc >= 2.19: */ _DEFAULT_SOURCE
                   || /* glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
           Before glibc 2.12:
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500