Linux 2.6 - man page for mktemp (linux section 3posix)
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MKTEMP(P) POSIX Programmer's Manual MKTEMP(P)
mktemp - make a unique filename (LEGACY)
char *mktemp(char *template);
The mktemp() function shall replace the contents of the string pointed to by template by a
unique filename and return template. The application shall initialize template to be a
filename with six trailing 'X' s; mktemp() shall replace each 'X' with a single byte char-
acter from the portable filename character set.
The mktemp() function shall return the pointer template. If a unique name cannot be cre-
ated, template shall point to a null string.
No errors are defined.
The following sections are informative.
Generating a Filename
The following example replaces the contents of the "template" string with a 10-character
filename beginning with the characters "file" and returns a pointer to the "template"
string that contains the new filename.
char *template = "/tmp/fileXXXXXX";
ptr = mktemp(template);
Between the time a pathname is created and the file opened, it is possible for some other
process to create a file with the same name. The mkstemp() function avoids this problem
and is preferred over this function.
This function may be withdrawn in a future version.
mkstemp() , tmpfile() , tmpnam() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 MKTEMP(P)
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