tmpfile(3S)

NAME
     tmpfile - create a temporary file

SYNOPSIS
     #include <stdio.h>

     FILE *tmpfile (void);

DESCRIPTION
     tmpfile creates a temporary file, and returns a corresponding FILE
     pointer.  The file is created on the temporary directory indicated by the
     string P_tmpdir in <stdio.h>.  If the file cannot be opened, a NULL
     pointer is returned.  Upon return from tmpfile, you may print an error
     message using perror(3C), to determine the reason for the failure.  A
     success call to tmpfile will create a temporary file just long enough to
     obtain the FILE pointer, then delete the file with unlink(2), and finally
     return the FILE pointer to the calling process.  Thus, the only means of
     accessing the temporary file is though the FILE pointer.  The file is
     opened for update ("w+").

     Although the name of the temporary file is generated similarly to those
     produced by tmpnam(3S), tmpfile uses its own algorithm to generate
     filenames similar to, but unique from, those generated by tmpnam.  This
     allocates the entire space of tmpnam-generated names to applications
     code. (See tmpnam(3S) for more information.)

SEE ALSO
     creat(2), unlink(2), fopen(3S), mktemp(3C), perror(3C), stdio(3S),
     tmpnam(3S).