Content-type: text/html Man page of mktemp

mktemp

Section: C Library Functions (3)
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NAME

mktemp, mkstemp - Construct a unique filename  

LIBRARY

Standard C Library (libc.so, libc.a),

System V Compatibility Library (libsys5.a)  

SYNOPSIS

Standard C Library

#include <stdlib.h>

int mkstemp(        char *template);

char *mktemp(        char *template);
 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

mktemp(), mkstemp():  XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

PARAMETERS

Points to a string to be replaced with a unique filename. The string in the template parameter must be a filename with six trailing Xs.  

DESCRIPTION

The mktemp() function replaces the contents of the string pointed to by the template parameter with a unique filename. The application must initialize template to be a filename with six trailing Xs; mktemp() replaces the Xs in the template string with a unique filename. Under libc.a, the filename is a unique combination of the thread name and process ID. Under libsys5.a, the filename is created with the getpid function.

The mkstemp() function performs the same substitution to the template name and also 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 mkstemp() function is not available under libsys5.a.  

RETURN VALUES

Upon successful completion, the mktemp() function returns the address of the string pointed to by the template parameter.

If the string pointed to by the template parameter contains no Xs, or if the mktemp() function is unable to construct a unique filename, the first character of the template parameter string is replaced with a null character, and a null pointer is returned.

Upon successful completion, the mkstemp() function returns an open file descriptor. If the mkstemp() function fails, it returns a value of -1.  

ERRORS

No errors are defined for this routine.  

RELATED INFORMATION

Functions: tmpfile(3), tmpnam(3), getpid(2)

Standards: standards(5) delim off


 

Index

NAME
LIBRARY
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
RETURN VALUES
ERRORS
RELATED INFORMATION

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Time: 02:40:54 GMT, October 02, 2010