tmpfile

Synopsis

#include <stdio.h>

FILE *tmpfile(void);

Status

Partially implemented

Conformance

IEEE Std 1003.1-2017

Description

The tmpfile() function shall create a temporary file and open a corresponding stream. The file shall be automatically deleted when all references to the file are closed. The file shall be opened as in fopen() for update (wb+), except that implementations may restrict the permissions, either by clearing the file mode bits or setting them to the value S_IRUSR | S_IWUSR.

In some implementations, a permanent file may be left behind if the process calling tmpfile() is killed while it is processing a call to tmpfile().

An error message may be written to standard error if the stream cannot be opened.

Return value

Upon successful completion, tmpfile() shall return a pointer to the stream of the file that is created. Otherwise, it shall return a null pointer and set errno to indicate the error.

Errors

The tmpfile() function shall fail if:

• EINTR - a signal was caught during tmpfile().

• EMFILE - all file descriptors available to the process are currently open.

• EMFILE - STREAM_MAX streams are currently open in the calling process.

• ENFILE - the maximum allowable number of files is currently open in the system.

• ENOSPC - the directory or file system which would contain the new file cannot be expanded.

• EOVERFLOW - the file is a regular file and the size of the file cannot be represented correctly in an object of type off_t.

The tmpfile() function may fail if:

• EMFILE - FOPEN_MAX streams are currently open in the calling process.

• ENOMEM - insufficient storage space is available.

Tests

Untested

Known bugs

None

See Also

1. Standard library functions
2. Table of Contents