tempnam - phpMan

TEMPNAM(3)                 Linux Programmer’s Manual                TEMPNAM(3)



NAME
       tempnam - create a name for a temporary file

SYNOPSIS
       #include <stdio.h>

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

DESCRIPTION
       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 tempnam() 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: (i)  In  case  the
       environment  variable  TMPDIR exists and contains the name of an appropriate direc-
       tory, that is used.  (ii) Otherwise, if the dir argument is non-NULL and  appropri-
       ate,  it is used.  (iii) Otherwise, P_tmpdir (as defined in <stdio.h>) is used when
       appropriate.  (iv) Finally an implementation-defined directory may be used.

RETURN VALUE
       The tempnam() function returns a pointer to a unique temporary filename, or NULL if
       a unique name cannot be generated.

ERRORS
       ENOMEM Allocation of storage failed.


NOTES
       SUSv2  does  not mention the use of TMPDIR; glibc will use it only when the program
       is not suid.  SVID2 specifies that the directory used under (iv)  is  /tmp.   SVID2
       specifies  that  the string returned by tempnam() was allocated using malloc(3) and
       hence can be freed by free(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
       behaviour is implementation defined.

       In case the pfx argument has length larger than five, glibc will use the first five
       bytes.  Upon failure to find a unique name, glibc will return EEXIST.

BUGS
       The  precise  meaning of ‘appropriate’ is undefined; it is unspecified how accessi-
       bility of a directory is determined.   Never  use  this  function.  Use  mkstemp(3)
       instead.

CONFORMING TO
       SVID 2, BSD 4.3, POSIX 1003.1-2003

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



                                  1999-06-14                        TEMPNAM(3)

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