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TMPFILE(3)                 Linux Programmer's ManualTMPFILE(3)NAME       tmpfile - create a temporary fileSYNOPSIS       #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; seesignal(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 at-tributes(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 the directory /tmp.SEE ALSOexit(3),mkstemp(3),mktemp(3),tempnam(3),tmpnam(3)COLOPHON       This  page  is  part of release 5.05 of the Linux man-pages project.  A       description of the project, information about reporting bugs,  and  the       latest     version     of     this    page,    can    be    found    at       https://www.kernel.org/doc/man-pages/.                                  2016-03-15TMPFILE(3)