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MKTEMP(3)		 BSD Library Functions Manual		     MKTEMP(3)

NAME
     mktemp -- make temporary file name	(unique)

SYNOPSIS
     #include <unistd.h>

     char *
     mktemp(char *template);

     int
     mkstemp(char *template);

DESCRIPTION
     The mktemp() function takes the given file	name template and overwrites a
     portion of	it to create a file name.  This	file name is unique and	suit-
     able for use by the application.  The template may	be any file name with
     some number of `Xs' appended to it, for example /tmp/temp.XXXX.  The
     trailing `Xs' are replaced	with the current process number	and/or a
     unique letter combination.	 The number of unique file names mktemp() can
     return depends on the number of `Xs' provided; six	`Xs' will result in
     mktemp() testing roughly 26 ** 6 combinations.

     The mkstemp() function makes the same replacement to the template and
     creates the template file,	mode 0600, returning a file descriptor opened
     for reading and writing.  This avoids the race between testing for	a
     file's existence and opening it for use.

RETURN VALUES
     The mktemp() function returns a pointer to	the template on	success	and
     NULL on failure.  The mkstemp() function returns -1 if no suitable	file
     could be created.	If either call fails an	error code is placed in	the
     global variable errno.

ERRORS
     The mktemp() and mkstemp()	functions may set errno	to one of the follow-
     ing values:

     [ENOTDIR]	The pathname portion of	the template is	not an existing	direc-
		tory.

     The mktemp() and mkstemp()	functions may also set errno to	any value
     specified by the stat(2) function.

     The mkstemp() function may	also set errno to any value specified by the
     open(2) function.

SEE ALSO
     chmod(2), getpid(2), open(2), stat(2)

HISTORY
     A mktemp function appeared	in Version 7 AT&T UNIX.

BSD				 June 4, 1993				   BSD

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | HISTORY

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