libc/sysdeps/linux/csky/clone.c

   1 /*
   2  * Copyright (C) 2017 Hangzhou C-SKY Microsystems co.,ltd.
   3  *
   4  * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB
   5  * in this tarball.
   6  */
   7
   8 #include <stdarg.h>
   9 #include <sysdep.h>
  10 #include <unistd.h>
  11
  12 extern long __syscall_error(int err_no);
  13
  14 extern int __csky_clone (
  15   int flags,
  16   void *child_stack,
  17   pid_t *ptid,
  18   pid_t *ctid,
  19   void *tls);
  20
  21 int __clone(
  22   int (*fn)(void *),
  23   void *child_stack,
  24   int flags,
  25   void *arg, ...)
  26 {
  27   void *ptid;
  28   void *tls;
  29   void *ctid;
  30   va_list al;
  31   int err;
  32
  33   va_start(al, arg);
  34   ptid = va_arg(al, void *);
  35   tls = va_arg(al, void *);
  36   ctid = va_arg(al, void *);
  37   va_end(al);
  38
  39   err = EINVAL;
  40   if (!fn)
  41     goto err;
  42   if (!child_stack)
  43     goto err;
  44
  45   /* prepare fn&arg in child_stack */
  46   child_stack = (void *)((unsigned int)child_stack - 8);
  47   *(unsigned int *)child_stack = (unsigned int)fn;
  48   *(unsigned int *)(child_stack + 4) = (unsigned int)arg;
  49
  50   return __csky_clone(flags, child_stack, ptid, ctid, tls);
  51 err:
  52   return __syscall_error(-err);
  53 }
  54 weak_alias(__clone, clone)