tmpfile(3)

1TMPFILE(3)                 Linux Programmer's Manual                TMPFILE(3)
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NAME

6       tmpfile - create a temporary file
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SYNOPSIS

9       #include <stdio.h>
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11       FILE *tmpfile(void);
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DESCRIPTION

14       The  tmpfile()  function  opens  a  unique  temporary  file  in  binary
15       read/write (w+b) mode.  The file will be automatically deleted when  it
16       is closed or the program terminates.
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RETURN VALUE

19       The tmpfile() function returns a stream descriptor, or NULL if a unique
20       filename cannot be generated or the unique file cannot  be  opened.  In
21       the latter case, errno is set to indicate the error.
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ERRORS

24       EACCES Search permission denied for directory in file's path prefix.
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26       EEXIST Unable to generate a unique filename.
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28       EINTR  The call was interrupted by a signal.
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30       EMFILE Too many file descriptors in use by the process.
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32       ENFILE Too many files open in the system.
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34       ENOSPC There was no room in the directory to add the new filename.
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36       EROFS  Read-only filesystem.
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CONFORMING TO

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

42       An  error  message  may  be  written  to stdout if the stream cannot be
43       opened.
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45       The standard does not specify the directory that  tmpfile()  will  use.
46       Glibc  will  try  the path prefix P_tmpdir defined in <stdio.h>, and if
47       that fails the directory /tmp.
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