tmpfile (3)

#include <stdio.h>

FILE *tmpfile(void);

The tmpfile() function opens a unique temporary file 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. In the latter case, errno is set to indicate the error.

EACCES

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

EEXIST

Unable to generate a unique filename.

EINTR

The call was interrupted by a signal.

EMFILE

Too many file descriptors in use by the process.

ENFILE

Too many files open in the system.

ENOSPC

There was no room in the directory to add the new filename.

EROFS

Read-only filesystem.

SVr4, 4.3BSD, C89, C99, SUSv2, POSIX.1-2001.

POSIX.1-2001 specifies: an error message may be written to stdout if the stream cannot be opened.

The standard does not specify the directory that tmpfile() will use. Glibc will try the path prefix P_tmpdir defined in <stdio.h>, and if that fails the directory /tmp.

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

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