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MKTEMP(3)		   Linux Programmer's Manual		     MKTEMP(3)

NAME
       mktemp -	make a unique temporary	file name

SYNOPSIS
       #include	<stdlib.h>

       char *mktemp(char *template);

DESCRIPTION
       The  mktemp() function generates	a unique temporary file	name from tem-
       plate.  The last	six characters of template must	be  XXXXXX  and	 these
       are  replaced  with  a  string that makes the filename unique. Since it
       will be modified, template must not be a	string constant, but should be
       declared	as a character array.

RETURN VALUE
       The  mktemp()  function	returns	NULL on	error (template	did not	end in
       XXXXXX) and template otherwise.	If the call was	successful,  the  last
       six  bytes  of  template	will have been modified	in such	a way that the
       resulting name is unique	(does not exist	 already).  If	the  call  was
       unsuccessful, template is made an empty string.

ERRORS
       EINVAL The last six characters of template were not XXXXXX.

CONFORMING TO
       BSD 4.3.	POSIX dictates tmpnam(3).

NOTE
       The prototype is	in _unistd.h_ for libc4, libc5,	glibc1;	glibc2 follows
       the Single Unix Specification and has the prototype in _stdlib.h_.

BUGS
       Never use mktemp(). Some	implementations	follow	BSD  4.3  and  replace
       XXXXXX  by  the current process id and a	single letter, so that at most
       26 different names can be returned.  Since on the one  hand  the	 names
       are  easy to guess, and on the other hand there is a race between test-
       ing whether the name exists and opening the file, every use of mktemp()
       is a security risk.  The	race is	avoided	by mkstemp(3).

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

GNU				  1993-04-03			     MKTEMP(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTE | BUGS | SEE ALSO

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