создать уникальное временное имя файла (make a unique temporary filename)
Имя (Name)
mktemp - make a unique temporary filename
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
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.
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.
Ошибки (Error)
EINVAL The last six characters of template were not XXXXXX.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│mktemp() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
4.3BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of
mktemp().
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).
Смотри также (See also)
mktemp(1), mkdtemp(3), mkstemp(3), tempnam(3), tmpfile(3),
tmpnam(3)
