Originální popis anglicky:
tmpnam - create a name for a temporary file
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
char *tmpnam(char *
s);
The
tmpnam() function shall generate a string that is a valid filename
and that is not the same as the name of 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
IEEE Std 1003.1-2001 calls
tmpnam().
If the application uses any of the functions guaranteed to be available if
either _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS is defined, the
application shall ensure that the
tmpnam() function is called with a
non-NULL parameter.
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.
No errors are defined.
The following sections are informative.
The following example generates a unique filename and stores it in the array
pointed to by
ptr.
#include <stdio.h>
...
char filename[L_tmpnam+1];
char *ptr;
ptr = tmpnam(filename);
This function only creates filenames. 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.
None.
None.
fopen() ,
open() ,
tempnam() ,
tmpfile() ,
unlink() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<stdio.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
