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   mktemp    ( 3 )

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Имя (Name)

mktemp - make a unique temporary filename

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Синопсис (Synopsis)

#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 since 2.19: */ _DEFAULT_SOURCE
                   || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
           Before glibc 2.12:
               _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500

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Описание (Description)

Never use this function; 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.

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Возвращаемое значение (Return value)

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.

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Ошибки (Error)

EINVAL The last six characters of template were not XXXXXX.

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Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

       ┌──────────────────────────────────────┬───────────────┬─────────┐
       │Interface                             │ Attribute     │ Value   │
       ├──────────────────────────────────────┼───────────────┼─────────┤
       │mktemp()                              │ Thread safety │ MT-Safe │
       └──────────────────────────────────────┴───────────────┴─────────┘

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Стандарты (Conforming to)

4.3BSD, POSIX.1-2001.  POSIX.1-2008 removes the specification of
       mktemp().

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Ошибки (баги) (Bugs)

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).

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Смотри также (See also)

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

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