C tmpfile() function

C library function - tmpfile()

The tmpfile() function is used to create a temporary file and open a corresponding stream. The file shall be automatically deleted when all references to the file are closed.

Note: The file shall be opened as in fopen() for update (wb+), except that implementations may restrict the permissions, either by clearing the file mode bits or setting them to the value S_IRUSR | S_IWUSR.

Syntax:

FILE *tmpfile(void);

Return value from tmpfile()

• Upon successful completion, tmpfile() shall return a pointer to the stream of the file that is created.
• Otherwise, it shall return a null pointer and set errno to indicate the error.

Example: tmpfile() function

The following example creates a temporary file for update, and returns a pointer to a stream for the created file in the fp variable.

#include <stdio.h>
int main () {
   FILE *fp;

   fp = tmpfile();
   printf("Temporary file created..!\n");

   /* Here you can use tmp file. */

   fclose(fp);

   return(0);
}

Output:

Temporary file created..!

Errors: The value of error number can be set to:

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