tmpfile(3)

NAME
tmpfile - create a temporary file

LIBRARY
Standard C library (libc, -lc)

SYNOPSIS
#include <stdio.h>

FILE *tmpfile(void);

DESCRIPTION
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.

RETURN VALUE
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.

ERRORS

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; see signal(7).

EMFILE
    The per-process limit on the number of open file descriptors has been reached.

ENFILE
    The system-wide limit on the total number of open files has been reached.

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

EROFS
    Read-only filesystem.

ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value
 | Thread safety | MT-Safe

VERSIONS
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, then the directory /tmp.

STANDARDS
C11, POSIX.1-2008.

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

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

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