__fseterr() — Set stream in error

Standards

Standards / Extensions	C or C++	Dependencies
Language Environment	both

Format

#include <stdio.h>
#include <stdio_ext.h>

void __fseterr(FILE *stream);

General description

The __fseterr() function sets the specified stream in error.

Returned value

The __fseterr() function returns no values.

An application wishing to check for error situations should set errno to 0, then call __fseterr(), and then check errno. If errno is nonzero, assume that an error has occurred.

Error Code: Description
EBADF: The stream specified by stream is not valid.

Example

CELEBF88

/* CELEBF88

   This example sets a stream in error.

*/

#include <stdio.h>
#include <stdio_ext.h>

void main() {
   FILE *f;
   char filename[FILENAME_MAX] = "myfile.dat";

   f = fopen(filename,"wb");
   if (f == NULL) {
      perror("fopen failed\n");
      return;
   }

   if (ferror(f)) printf("The error indicator is set for the open stream\n");
   else printf("The error indicator is not set for the open stream\n");

   __fseterr(f);

   if (ferror(f)) printf("The error indicator is set for the open stream\n");
   else printf("The error indicator is not set for the open stream\n");

   return;
}

Output

The error indicator is not set for the open stream
The error indicator is set for the open stream