Substitutes the file named by a file specification for the open file
addressed by a file pointer. The latter file is closed.
Format
#include <stdio.h>
FILE *freopen (const char *file_spec, const char
*a_mode, FILE *file_ptr, . . . );
Arguments
- file_spec
- A pointer to a string that contains a valid OpenVMS or UNIX
style file specification. After the function call, the given file
pointer is associated with this file.
- a_mode
- The access mode indicator. The fdopen function in this section
describes the access mode argument.
- file_ptr
- A file pointer.
- . . .
- Optional file attribute arguments. The file attribute arguments
are the same as those used in the creat function.
Description
This function is typically used to associate one of the
predefined names stdin, stdout, or stderr with a file. For more
information about these predefined names, see Chapter 2.
Return Values
| file_ptr | The file pointer, if
freopen is successful. |
| NULL |
Indicates an error. |
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