Originální popis anglicky:
tmpfile - create a temporary file
Návod, kniha: POSIX Programmer's Manual
#include <stdio.h>
FILE *tmpfile(void);
The
tmpfile() function shall create a temporary file and open a
corresponding stream. The file shall be automatically deleted when all
references to the file are closed. The file is opened as in
fopen() for
update (
w+).
In some implementations, a permanent file may be left behind if the process
calling
tmpfile() is killed while it is processing a call to
tmpfile().
An error message may be written to standard error if the stream cannot be
opened.
Upon successful completion,
tmpfile() shall return a pointer to the
stream of the file that is created. Otherwise, it shall return a null pointer
and set
errno to indicate the error.
The
tmpfile() function shall fail if:
- EINTR
- A signal was caught during tmpfile().
- EMFILE
- {OPEN_MAX} file descriptors are currently open in the
calling process.
- ENFILE
- The maximum allowable number of files is currently open in
the system.
- ENOSPC
- The directory or file system which would contain the new
file cannot be expanded.
- EOVERFLOW
- The file is a regular file and the size of the file cannot
be represented correctly in an object of type off_t.
The
tmpfile() function may fail if:
- EMFILE
- {FOPEN_MAX} streams are currently open in the calling
process.
- ENOMEM
- Insufficient storage space is available.
The following sections are informative.
The following example creates a temporary file for update, and returns a pointer
to a stream for the created file in the
fp variable.
#include <stdio.h>
...
FILE *fp;
fp = tmpfile ();
It should be possible to open at least {TMP_MAX} temporary files during the
lifetime of the program (this limit may be shared with
tmpnam()) and
there should be no limit on the number simultaneously open other than this
limit and any limit on the number of open files ( {FOPEN_MAX}).
None.
None.
fopen() ,
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
.
