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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.1‐2008 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.1‐2008, 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.1‐2008, stdio.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/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 2013 TMPNAM(3P)
Pages that refer to this page: stdio.h(0p), mkdtemp(3p), tempnam(3p), tmpfile(3p)