1 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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  12 .Dd "Jul 21, 2014"
  13 .Dt MKTEMP 3C
  14 .Os
  15 .Sh NAME
  16 .Nm mktemp
  17 .Nd make a unique file name  from a template
  18 .Sh SYNOPSIS
  19 .In stdlib.h
  20 .Ft "char *"
  21 .Fn mktemp "char *template"
  22 .Sh DESCRIPTION
  23 The
  24 .Fn mktemp
  25 function replaces the contents of the string pointed to by
  26 .Fa template
  27 with a unique file name, and returns
  28 .Fa template .
  29 The string in
  30 .Fa template
  31 should look like a file name with six trailing
  32 .So X Sc Ns s ;
  33 .Fn mktemp
  34 will replace the
  35 .So X Sc Ns s
  36 with a character string that can be used
  37 to create a unique file name. Only 26 unique file names per thread can be
  38 created for each unique
  39 .Fa template .
  40 .Sh RETURN VALUES
  41 The
  42 .Fn mktemp
  43 function returns a pointer to the
  44 .Fa template
  45 on success and
  46 .Dv NULL
  47 if unique name cannot be created.
  48 .Sh EXAMPLES
  49 .Ss Example 1 Generate a filename.
  50 The following example replaces the contents of the "template" string with a
  51 10-character filename beginning with the characters "file" and returns a
  52 pointer to the "template" string that contains the new filename.
  53 .Bd -literal -offset indent
  54 #include <stdlib.h>
  55 \&...
  56 char template[] = "/tmp/fileXXXXXX";
  57 char *ptr;
  58 ptr = mktemp(template);
  59 .Ed
  60 .Sh ERRORS
  61 No errors are defined.
  62 .Sh SECURITY
  63 Between the time a pathname is created and the file opened, it is possible for
  64 some other process to create a file with the same name. The
  65 .Xr mkstemp 3C
  66 function avoids this problem and is preferred over this function.
  67 .Sh INTERFACE STABILITY
  68 .Sy Obsolete Standard .
  69 .Sh MT-LEVEL
  70 .Sy Safe .
  71 .Sh SEE ALSO
  72 .Xr mkstemp 3C ,
  73 .Xr tmpfile 3C ,
  74 .Xr tmpnam 3C ,
  75 .Xr standards 5
  76 .Sh STANDARDS
  77 The
  78 .Fn mktemp
  79 function was introduced in
  80 .At v7
  81 and subsequently standardized in
  82 .St -xpg4.2 .
  83 It was obsoleted in
  84 .St -p1003.1-2001 ,
  85 and removed from
  86 .St -p1003.1-2008 .