TMPFILE(3)                                                              Linux Programmer's Manual                                                             TMPFILE(3)

NAME
       tmpfile - create a temporary file

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   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │tmpfile()                                                                                                                             │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD, SUSv2.

NOTES
       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, then the
       directory /tmp.

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

                                                                               2021-03-22                                                                     TMPFILE(3)