PR_SET_UNALIGN(2const) — Linux manual page

PR_SET_UNALIGN(2const)                            PR_SET_UNALIGN(2const)

NAME

       PR_SET_UNALIGN - set unaligned access control bits

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       int prctl(PR_SET_UNALIGN, unsigned long flag);

DESCRIPTION

       Set unaligned access control bits to arg2.

       Pass PR_UNALIGN_NOPRINT to silently fix up unaligned user
       accesses, or PR_UNALIGN_SIGBUS to generate SIGBUS on unaligned
       user access.

       Alpha also supports an additional flag with the value of 4 and no
       corresponding named constant, which instructs kernel to not fix
       up unaligned accesses (it is analogous to providing the UAC_NOFIX
       flag in SSI_NVPAIRS operation of the setsysinfo() system call on
       Tru64).

RETURN VALUE

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

ERRORS

       EINVAL flag is not a valid value.

STANDARDS

       Linux.

HISTORY

       Only on:

       •  ia64, since Linux 2.3.48
       •  parisc, since Linux 2.6.15
       •  PowerPC, since Linux 2.6.18
       •  Alpha, since Linux 2.6.22
       •  sh, since Linux 2.6.34
       •  tile, since Linux 3.12

SEE ALSO

       prctl(2), PR_GET_UNALIGN(2const)

COLOPHON

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       man-pages@man7.org

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

Pages that refer to this page: prctl(2), PR_GET_UNALIGN(2const)

---