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   tmpnam.3p    ( 3 )

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Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

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Имя (Name)

tmpnam — create a name for a temporary file

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Синопсис (Synopsis)

#include <stdio.h>

       char *tmpnam(char *s);

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Описание (Description)

The functionality described on this reference page is aligned
       with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This
       volume of POSIX.1‐2017 defers to the ISO C standard.

       The tmpnam() function shall generate a string that is a valid
       pathname that does not name an existing file. The function is
       potentially capable of generating {TMP_MAX} different strings,
       but any or all of them may already be in use by existing files
       and thus not be suitable return values.

       The tmpnam() function generates a different string each time it
       is called from the same process, up to {TMP_MAX} times. If it is
       called more than {TMP_MAX} times, the behavior is implementation-
       defined.

       The implementation shall behave as if no function defined in this
       volume of POSIX.1‐2017, except tempnam(), calls tmpnam().

       The tmpnam() function need not be thread-safe if called with a
       NULL parameter.

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Возвращаемое значение (Return value)

Upon successful completion, tmpnam() shall return a pointer to a
       string. If no suitable string can be generated, the tmpnam()
       function shall return a null pointer.

       If the argument s is a null pointer, tmpnam() shall leave its
       result in an internal static object and return a pointer to that
       object. Subsequent calls to tmpnam() may modify the same object.
       If the argument s is not a null pointer, it is presumed to point
       to an array of at least L_tmpnam chars; tmpnam() shall write its
       result in that array and shall return the argument as its value.

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Ошибки (Error)

No errors are defined.

       The following sections are informative.

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Примеры (Examples)

Generating a Pathname
       The following example generates a unique pathname and stores it
       in the array pointed to by ptr.

           #include <stdio.h>
           ...
           char pathname[L_tmpnam+1];
           char *ptr;

           ptr = tmpnam(pathname);

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Использование в приложениях (Application usage)

This function only creates pathnames. It is the application's
       responsibility to create and remove the files.

       Between the time a pathname is created and the file is opened, it
       is possible for some other process to create a file with the same
       name.  Applications may find tmpfile() more useful.

       Applications should use the tmpfile(), mkstemp(), or mkdtemp()
       functions instead of the obsolescent tmpnam() function.

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Обоснование (Rationale)

None.

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Будущие направления (Future directions)

The tmpnam() function may be removed in a future version.

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Смотри также (See also)

fopen(3p), open(3p), mkdtemp(3p), tempnam(3p), tmpfile(3p),
       unlink(3p)

       The Base Definitions volume of POSIX.1‐2017, stdio.h(0p)

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