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    Command:

    tempnam

    
    
    

    SYNOPSIS

           #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.
    
    
    

    CONFORMING TO

           SVr4,  4.3BSD, POSIX.1-2001.  POSIX.1-2008 marks tempnam() as obsolete.
    
    
    

    NOTES

           Although tempnam() generates names that are difficult to guess,  it  is
           nevertheless  possible  that  between the time that tempnam() returns a
           pathname, and the time that the program opens it, another program might
           create  that  pathname  using open(2), or create it as a symbolic link.
    
           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)
    
                                      2014-02-27                        TEMPNAM(3)
    
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