NAME
PR_SET_UNALIGN - set unaligned access control bits
LIBRARY
Standard C library (libc, -lc)
SYNOPSIS
#include <linux/prctl.h>\n /* Definition of \nPR_*\n constants */
\n#include <sys/prctl.h>int prctl(PR_SET_UNALIGN, unsigned long \nflag\n);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)