HP C/iX Library Reference Manual (30026-90004)

Chapter 5 259
HP C/iX Library Function Descriptions
mktemp
mktemp
Creates a unique file name.
Syntax
char *mktemp (char * template )
Parameters
template A character pointer to a string containing a template file name having six
trailing Xs.
Return Values
x A pointer to template , or to a null string if it runs out of letters.
Description
The mktemp function replaces the contents of the string pointed to by template with a
unique file name, and returns the address of
template .
This function replaces the Xsin
template with a letter and a number. The letter is chosen
so that the resulting name does not duplicate the name of an existing file. If there are
fewer than 6 Xs in
template , the letter is dropped first, and then high-order digits of the
process ID are dropped.
The mktemp function returns the unique file name in
template . Therefore, you must
refresh the template for every unique file you want to open. If mktemp runs out of letters, it
returns a pointer to the empty string "".
mktemp does not check to see if the file name part of
template exceeds the maximum
length of a file name.
See Also
getpid(), open(), tmpfile(), tmpnam()