.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH PR_SET_ENDIAN 2const 2025-09-06 "Linux man-pages 6.16"
.SH NAME
PR_SET_ENDIAN
\-
set endianness of the calling process
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.BR "#include <linux/prctl.h>" "  /* Definition of " PR_* " constants */"
.B #include <sys/prctl.h>
.P
.BI "int prctl(PR_SET_ENDIAN, long " endianness );
.fi
.SH DESCRIPTION
Set the endianness of the calling process
to the value given in
.IR endianness ,
which should be one of the following:
.\" Respectively 0, 1, 2
.BR PR_ENDIAN_BIG ,
.BR PR_ENDIAN_LITTLE ,
or
.B PR_ENDIAN_PPC_LITTLE
(PowerPC pseudo little endian).
.SH RETURN VALUE
On success,
0 is returned.
On error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
.I endianness
is not a valid value.
.SH STANDARDS
Linux.
PowerPC only.
.SH HISTORY
Linux 2.6.18 (PowerPC).
.SH SEE ALSO
.BR prctl (2),
.BR PR_GET_ENDIAN (2const)