Originální popis anglicky:
tempnam - create a name for a temporary file
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
char *tempnam(const char *
dir, const char
*pfx);
The
tempnam() function shall generate a pathname that may be used for a
temporary file.
The
tempnam() function allows the user to control the choice of a
directory. The
dir argument points to the name of the directory in
which the file is to be created. If
dir is a null pointer or points to
a string which is not a name for an appropriate directory, the path prefix
defined as P_tmpdir in the
<stdio.h> header shall be used. If
that directory is not accessible, an implementation-defined directory may be
used.
Many applications prefer their temporary files to have certain initial letter
sequences in their names. The
pfx argument should be used for this.
This argument may be a null pointer or point to a string of up to five bytes
to be used as the beginning of the filename.
Some implementations of
tempnam() may use
tmpnam() internally. On
such implementations, if called more than {TMP_MAX} times in a single process,
the behavior is implementation-defined.
Upon successful completion,
tempnam() shall allocate space for a string,
put the generated pathname in that space, and return a pointer to it. The
pointer shall be suitable for use in a subsequent call to
free().
Otherwise, it shall return a null pointer and set
errno to indicate the
error.
The
tempnam() function shall fail if:
- ENOMEM
- Insufficient storage space is available.
The following sections are informative.
The following example generates a pathname for a temporary file in directory
/tmp, with the prefix
file. After the filename has been created,
the call to
free() deallocates the space used to store the filename.
#include <stdio.h>
#include <stdlib.h>
...
char *directory = "/tmp";
char *fileprefix = "file";
char *file;
file = tempnam(directory, fileprefix);
free(file);
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.
None.
None.
fopen() ,
free() ,
open() ,
tmpfile() ,
tmpnam() ,
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
.
