tempnam

       #include <stdio.h>

       char *tempnam(const char *dir, const char *pfx);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       tempnam(): _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION
       Never use this function.  Use mkstemp(3) or tmpfile(3) instead.

       The  tempnam()  function  returns a pointer to a string that is a valid
       filename, and such that a file with this name did not exist when  temp-
       nam()  checked.   The  filename  suffix  of the pathname generated will
       start with pfx in case pfx is a non-NULL string of at most five  bytes.
       The  directory  prefix part of the pathname generated is required to be
       "appropriate" (often that at least implies writable).

       Attempts to find an appropriate  directory  go  through  the  following
       steps:

       a) In case the environment variable TMPDIR exists and contains the name
          of an appropriate directory, that is used.

       b) Otherwise, if the dir argument is non-NULL and  appropriate,  it  is
          used.

       c) Otherwise, P_tmpdir (as defined in <stdio.h>) is used when appropri-
          ate.

       d) Finally an implementation-defined directory may be used.

       The string returned by tempnam() is allocated using malloc(3) and hence
       should be freed by free(3).

RETURN VALUE
       On success, the tempnam() function returns a pointer to a unique tempo-
       rary filename.  It returns NULL if a unique name cannot  be  generated,
       with errno set to indicate the cause of the error.

ERRORS
       ENOMEM Allocation of storage failed.

ATTRIBUTES
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       +----------+---------------+-------------+
       |Interface | Attribute     | Value       |
       +----------+---------------+-------------+
       |tempnam() | Thread safety | MT-Safe env |
       +----------+---------------+-------------+
CONFORMING TO
       SVr4, 4.3BSD, POSIX.1-2001.  POSIX.1-2008 marks tempnam() as obsolete.
       is /tmp (and this is what glibc does).

       Because it dynamically allocates memory used to  return  the  pathname,
       tempnam() is reentrant, and thus thread safe, unlike tmpnam(3).

       The  tempnam()  function  generates  a different string each time it is
       called, up to TMP_MAX (defined in <stdio.h>) times.  If  it  is  called
       more than TMP_MAX times, the behavior is implementation defined.

       tempnam() uses at most the first five bytes from pfx.

       The  glibc  implementation of tempnam() will fail with the error EEXIST
       upon failure to find a unique name.

BUGS
       The precise meaning of "appropriate" is undefined;  it  is  unspecified
       how accessibility of a directory is determined.

SEE ALSO
       mkstemp(3), mktemp(3), tmpfile(3), tmpnam(3)

COLOPHON
       This  page  is  part of release 4.04 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       http://www.kernel.org/doc/man-pages/.

                                  2015-03-02                        TEMPNAM(3)
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