Clear a stream's end-of-file and error flags
#include <stdio.h> void clearerr( FILE *fp );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The clearerr() function clears the end-of-file and error flags for the stream specified by fp.
These indicators are also cleared when the file is opened, or by an explicit call to clearerr() or rewind().
#include <stdio.h> #include <stdlib.h> int main( void ) { FILE *fp; int c; c = 'J'; fp = fopen( "file", "w" ); if( fp != NULL ) { fputc( c, fp ); if( ferror( fp ) ) { /* if error */ clearerr( fp ); /* clear the error */ fputc( c, fp ); /* and retry it */ } } fclose( fp ); return EXIT_SUCCESS; }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |