mkstemps man page on SmartOS

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MKSTEMP(3C)							   MKSTEMP(3C)

       mkstemp,	 mkstemps,  mkostemp,  mkostemps, mkdtemp - make a unique file
       name from a template and open the file

       #include <stdlib.h>

       int mkstemp(char *template);

       int mkostemp(char *template, int flags);

       int mkstemps(char *template, int slen);

       int mkostemps(char *template, int slen, int flags);

       char *mkdtemp(char *template);

       The mkstemp() function replaces the contents of the string  pointed  to
       by  template  by	 a unique file name, and returns a file descriptor for
       the file open for reading and writing. The function thus	 prevents  any
       possible	 race  condition  between  testing whether the file exists and
       opening it for use. The string in template should look like a file name
       with  six  trailing  'X's; mkstemp() replaces each 'X' with a character
       from the portable file name character set. The  characters  are	chosen
       such that the resulting name does not duplicate the name of an existing

       The mkstemps() function behaves the same as mkstemp(), except  it  per‐
       mits  a	suffix to exist in the template. The template should be of the
       form /tmp/tmpXXXXXXsuffix. The slen parameter specifies the  length  of
       the suffix string.

       The  mkostemp()	and  mkostemps are like their mkstemp() and mkstemps()
       couterparts except that the flags argument is present and used to  sup‐
       plement	(as  a	bitwise	 inclusive-OR) flags to internal open() calls.
       (e.g. O_SYNC, O_APPEND, and O_CLOEXEC).

       The mkdtemp() function makes the same replacement to the template as in
       mktemp(3C) and creates the template directory using mkdir(2), passing a
       mode argument of 0700.

       Upon successful completion, mkstemp() returns an open file  descriptor.
       Otherwise −1 is returned if no suitable file could be created.

       The mkstemp(), mkstemps(), and mkdtemp() functions can set errno to the
       same values as lstat(2).

       The mkstemp() and mkstemps() functions can set errno to the same values
       as open(2).

       The mkdtemp() function can set errno to the same values as mkdir(2).

       It is possible to run out of letters.

       The  mkstemp()  function	 does  not check to determine whether the file
       name part of template exceeds the maximum allowable file name length.

       The tmpfile(3C) function is preferred over this function.

       The mkstemp() function is frequently used to create  a  temporary  file
       that  will  be removed by the application before the application termi‐

       The mkstemp() function has a transitional  interface  for  64-bit  file
       offsets. See lf64(5).

       See attributes(5) for descriptions of the following attributes:

       │Interface Stability │ See below.      │

       The  mkstemp() function is Standard. The mkstemps() and mkdtemp() func‐
       tions are Stable.

       getpid(2),  lstat(2),  mkdir(2),	 open(2),   tmpfile(3C),   mktemp(3C),
       attributes(5), lf64(5), standards(5)

				 Apr 19, 2013			   MKSTEMP(3C)

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