PR_SET_UNALIGN(2const) - Linux manual page (original) (raw)

PRSETUNALIGN(2const) PRSETUNALIGN(2const)

NAME top

   PR_SET_UNALIGN - set unaligned access control bits

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

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

   **int prctl(PR_SET_UNALIGN, unsigned long** _flag_**);**

DESCRIPTION top

   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 top

   On success, 0 is returned.  On error, -1 is returned, and _[errno](../man3/errno.3.html)_ is
   set to indicate the error.

ERRORS top

   **EINVAL** _flag_ is not a valid value.

STANDARDS top

   Linux.

HISTORY top

   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 top

   [prctl(2)](../man2/prctl.2.html), [PR_GET_UNALIGN(2const)](../man2/PR%5FGET%5FUNALIGN.2const.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 PRSETUNALIGN(2const)

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