tempfile.c File Reference

#include <errno.h>
#include <paths.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>

Include dependency graph for tempfile.c:

Functions
FILE *	tempfile (void)
	A secure tmpfile() replacement. More...

Detailed Description

Author

Joachim Wiberg

Date

2015-2021

Copyright

ISC License

Function Documentation

tempfile()

FILE* tempfile

(

void

)

A secure tmpfile() replacement.

This is the secure replacement for tmpfile() that does not exist in GLIBC. It uses the Linux specific O_TMPFILE and O_EXCL to hide the filename. When the FILE is fclose()'ed, the file contents is lost. The file is hidden in the _PATH_TMP ("/tmp") directory in the system.

This function requires Linux 3.11, or later, due to O_TMPFILE. Not all file systems support hidden inodes, in which case this function defaults to call tmpfile() as a fallback.

Returns

An open FILE pointer, or NULL on error.