github.com/afumu/libc@v0.0.6/musl/src/stdio/fclose.c (about)

     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  }