1#include "stdio_impl.h" 2 3/* stdout.c will override this if linked */ 4static FILE *volatile dummy = 0; 5weak_alias(dummy, __stdout_used); 6 7int fflush(FILE *f) 8{ 9 if (!f) { 10 int r = __stdout_used ? fflush(__stdout_used) : 0; 11 12 for (f=*__ofl_lock(); f; f=f->next) 13 if (f->wpos > f->wbase) r |= fflush(f); 14 __ofl_unlock(); 15 16 return r; 17 } 18 19 FLOCK(f); 20 21 /* If writing, flush output */ 22 if (f->wpos > f->wbase) { 23 f->write(f, 0, 0); 24 if (!f->wpos) { 25 FUNLOCK(f); 26 return EOF; 27 } 28 } 29 30 /* If reading, sync position, per POSIX */ 31 if (f->rpos < f->rend) f->seek(f, f->rpos-f->rend, SEEK_CUR); 32 33 /* Clear read and write modes */ 34 f->wpos = f->wbase = f->wend = 0; 35 f->rpos = f->rend = 0; 36 37 FUNLOCK(f); 38 return 0; 39} 40 41weak_alias(fflush, fflush_unlocked); 42