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)

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