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.\" Copyright, the authors of the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH PR_CAP_AMBIENT_IS_SET 2const 2025-05-17 "Linux man-pages (unreleased)"
.SH NAME
PR_CAP_AMBIENT_IS_SET
\-
read 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, PR_CAP_AMBIENT_IS_SET, long " cap ", 0L, 0L);"
.fi
.SH DESCRIPTION
This call
returns 1 if the capability in
.I cap
is in the ambient capability set and 0 if it is not.
.SH RETURN VALUE
On success,
this call
returns the boolean value described above.
On error, \-1 is returned, and
.I errno
is set to indicate the error.
.SH ERRORS
.TP
.B EINVAL
.I cap
does not specify a valid capability.
.SH VERSIONS
See
.BR PR_CAP_AMBIENT (2const).
.SH STANDARDS
Linux.
.SH HISTORY
Linux 4.3.
.\" commit 58319057b7847667f0c9585b9de0e8932b0fdb08
.SH SEE ALSO
.BR prctl (2),
.BR PR_CAP_AMBIENT (2const),
.BR libcap (3)
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