fclose.c raw

   1  #include "stdio_impl.h"
   2  #include <stdlib.h>
   3  
   4  static void dummy(FILE *f) { }
   5  weak_alias(dummy, __unlist_locked_file);
   6  
   7  int fclose(FILE *f)
   8  {
   9  	int r;
  10  	
  11  	FLOCK(f);
  12  	r = fflush(f);
  13  	r |= f->close(f);
  14  	FUNLOCK(f);
  15  
  16  	/* Past this point, f is closed and any further explict access
  17  	 * to it is undefined. However, it still exists as an entry in
  18  	 * the open file list and possibly in the thread's locked files
  19  	 * list, if it was closed while explicitly locked. Functions
  20  	 * which process these lists must tolerate dead FILE objects
  21  	 * (which necessarily have inactive buffer pointers) without
  22  	 * producing any side effects. */
  23  
  24  	if (f->flags & F_PERM) return r;
  25  
  26  	__unlist_locked_file(f);
  27  
  28  	FILE **head = __ofl_lock();
  29  	if (f->prev) f->prev->next = f->next;
  30  	if (f->next) f->next->prev = f->prev;
  31  	if (*head == f) *head = f->next;
  32  	__ofl_unlock();
  33  
  34  	free(f->getln_buf);
  35  	free(f);
  36  
  37  	return r;
  38  }
  39