.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH PR_CAP_AMBIENT 2const 2025-05-17 "Linux man-pages 6.16"
.SH NAME
PR_CAP_AMBIENT
\-
read or change the ambient capability set of the calling thread
.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_CAP_AMBIENT, long " op ", ...);"
.fi
.SH DESCRIPTION
Reads or changes the ambient capability set of the calling thread,
according to the value of
.IR op ,
which must be one of the following:
.TP
.B PR_CAP_AMBIENT_RAISE
.TQ
.B PR_CAP_AMBIENT_LOWER
.TQ
.B PR_CAP_AMBIENT_IS_SET
.TQ
.B PR_CAP_AMBIENT_CLEAR_ALL
.SH RETURN VALUE
On success,
a nonnegative value is returned.
On error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
.I op
is not a valid value.
.SH VERSIONS
Higher-level interfaces layered on top of the above operations are
provided in the
.BR libcap (3)
library in the form of
.BR cap_get_ambient (3),
.BR cap_set_ambient (3),
and
.BR cap_reset_ambient (3).
.SH STANDARDS
Linux.
.SH HISTORY
Linux 4.3.
.\" commit 58319057b7847667f0c9585b9de0e8932b0fdb08
.SH SEE ALSO
.BR prctl (2),
.BR PR_CAP_AMBIENT_RAISE (2const),
.BR PR_CAP_AMBIENT_LOWER (2const),
.BR PR_CAP_AMBIENT_IS_SET (2const),
.BR PR_CAP_AMBIENT_CLEAR_ALL (2const),
.BR libcap (3),
.BR cap_get_ambient (3),
.BR cap_set_ambient (3),
.BR cap_reset_ambient (3)