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