TMPFILE

tmpfile − create a temporary file

#include <stdio.h>

FILE *tmpfile (void);

The tmpfile() function generates a unique temporary filename using the path prefix P_tmpdir defined in <stdio.h>. The temporary file is then opened in binary read/write (w+b) mode. The file will be automatically deleted when it is closed or the program terminates.

The tmpfile() function returns a stream descriptor, or NULL if a unique filename cannot be generated or the unique file cannot be opened.

EACCES

Search permission denied for directory in file’s path prefix.

EEXIST

Unable to generate a unique filename.

EMFILE

Too many file descriptors in use by process.

ENFILE

Too many files open in system.

EROFS

Read-only filesystem.

SVID 3, POSIX, BSD 4.3, ISO 9899

mktemp(3), mkstemp(3), tmpnam(3), tempnam(3)