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tmpfile(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|VERSIONS \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

tmpfile(3)               Library Functions Manualtmpfile(3)

NAME top

       tmpfile - create a temporary file

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

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

DESCRIPTION top

       Thetmpfile() 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 top

       Thetmpfile() 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 top

EACCESSearch permission denied for directory in file's path              prefix.EEXISTUnable to generate a unique filename.EINTRThe call was interrupted by a signal; seesignal(7).EMFILEThe per-process limit on the number of open file              descriptors has been reached.ENFILEThe system-wide limit on the total number of open files has              been reached.ENOSPCThere was no room in the directory to add the new filename.EROFSRead-only filesystem.

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │tmpfile()                            │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

VERSIONS top

       The standard does not specify the directory thattmpfile() will       use.  glibc will try the path prefixP_tmpdir defined in<stdio.h>, and if that fails, then the directory/tmp.

STANDARDS top

       C11, POSIX.1-2008.

HISTORY top

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

NOTES top

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

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17tmpfile(3)

Pages that refer to this page:getpid(2), open(2), exit(3), mkdtemp(3), mkstemp(3), mktemp(3), stdio(3), tempnam(3), tmpnam(3)

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