PR_GET_TID_ADDRESS(2const) — Linux manual page

PR_GET_TID_ADDRESS(2const)                    PR_GET_TID_ADDRESS(2const)

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)

COLOPHON

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Linux man-pages 6.9.1          2024-06-02     PR_GET_TID_ADDRESS(2const)

Pages that refer to this page: prctl(2)

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