NAME

       PR_GET_TID_ADDRESS - get the clear_child_tid address

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <linux/prctl.h>  /* Definition of PR_* constants */
       #include <sys/prctl.h>

       int prctl(PR_GET_TID_ADDRESS, int **addrp);

DESCRIPTION

       Return   the   clear_child_tid   address   set  by  set_tid_address(2)  and  the  clone(2)
       CLONE_CHILD_CLEARTID flag, in the location pointed to by addrp.

       This feature is available only if the kernel is built with  the  CONFIG_CHECKPOINT_RESTORE
       option enabled.

RETURN VALUE

       On  success,  0  is  returned.  On error, -1 is returned, and errno is set to indicate the
       error.

ERRORS

       EFAULT addrp is an invalid address.

STANDARDS

       Linux.

HISTORY

       Linux 3.5.

CAVEATS

       Note that since the prctl() system call does not have  a  compat  implementation  for  the
       AMD64  x32  and  MIPS  n32  ABIs,  and  the kernel writes out a pointer using the kernel's
       pointer size, this operation expects a user-space buffer of 8 (not 4) bytes on these ABIs.

SEE ALSO

       prctl(2)