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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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TMPNAM(3P) POSIX Programmer's Manual TMPNAM(3P)
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.
tmpnam — create a name for a temporary file
#include <stdio.h>
char *tmpnam(char *s);
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.
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.
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);
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.
None.
The tmpnam() function may be removed in a future version.
fopen(3p), open(3p), mkdtemp(3p), tempnam(3p), tmpfile(3p),
unlink(3p)
The Base Definitions volume of POSIX.1‐2017, stdio.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 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 .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 TMPNAM(3P)
Pages that refer to this page: stdio.h(0p), mkdtemp(3p), tempnam(3p), tmpfile(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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