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mktemp.0
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1996-09-02
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MKTEMP(3) UNIX Programmer's Manual MKTEMP(3)
NNAAMMEE
mmkktteemmpp - make temporary file name (unique)
SSYYNNOOPPSSIISS
##iinncclluuddee <<uunniissttdd..hh>>
_c_h_a_r _*
mmkktteemmpp(_c_h_a_r _*_t_e_m_p_l_a_t_e)
_i_n_t
mmkksstteemmpp(_c_h_a_r _*_t_e_m_p_l_a_t_e)
DDEESSCCRRIIPPTTIIOONN
The mmkktteemmpp() 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 _/_t_m_p_/_t_e_m_p_._X_X_X_X. The
trailing `Xs' are replaced with the current process number and/or a
unique letter combination. The number of unique file names mmkktteemmpp() can
return depends on the number of `Xs' provided; six `Xs' will result in
mmkktteemmpp() testing roughly 26 ** 6 combinations.
The mmkksstteemmpp() 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.
RREETTUURRNN VVAALLUUEESS
The mmkktteemmpp() function returns a pointer to the template on success and
NULL on failure. The mmkksstteemmpp() function returns -1 if no suitable file
could be created. If either call fails an error code is placed in the
global variable _e_r_r_n_o.
EERRRROORRSS
The mmkktteemmpp() and mmkksstteemmpp() functions may set _e_r_r_n_o to one of the follow-
ing values:
[ENOTDIR] The pathname portion of the template is not an existing di-
rectory.
The mmkktteemmpp() and mmkksstteemmpp() functions may also set _e_r_r_n_o to any value
specified by the stat(2) function.
The mmkksstteemmpp() function may also set _e_r_r_n_o to any value specified by the
open(2) function.
SSEEEE AALLSSOO
chmod(2), getpid(2), open(2), stat(2)
HHIISSTTOORRYY
A mmkktteemmpp() function appeared in Version 7 AT&T UNIX.
BSD Experimental June 4, 1993 1