tmpfile—create a temporary file #include <stdio.h>
FILE *tmpfile(void);
FILE *_tmpfile_r(struct _reent *reent);
Description
Create a temporary file (a file which will be deleted automatically),
using a name generated by tmpnam. The temporary file is opened with
the mode "wb+", permitting you to read and write anywhere in it
as a binary file (without any data transformations the host system may
perform for text files).
The alternate function _tmpfile_r is a reentrant version. The
argument reent is a pointer to a reentrancy structure.
Returns
tmpfile normally returns a pointer to the temporary file. If no
temporary file could be created, the result is NULL, and errno
records the reason for failure.
Portability
tmpfile.
Supporting OS subroutines required: close, fstat, getpid,
isatty, lseek, open, read, sbrk, write.
tmpfile also requires the global pointer environ.