tmpfile - create a temporary file
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.
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.
|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.|
For an explanation of the terms used in this section, see attributes(7).
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD, SUSv2.
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.