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4ecaf7e98a
To prevent conflicts with other ioctl numbers to allow strace to have an
idea of what is happening, add the range of ioctls for the trace buffer
mapping from _IO("T", 0x1) to the range of "R" 0x20 - 0x2F.
Link: https://lore.kernel.org/linux-trace-kernel/20240630105322.GA17573@altlinux.org/
Link: https://lore.kernel.org/linux-trace-kernel/20240630213626.GA23566@altlinux.org/
Cc: Jonathan Corbet <corbet@lwn.net>
Fixes: cf9f0f7c4c5bb ("tracing: Allow user-space mapping of the ring-buffer")
Link: https://lore.kernel.org/20240702153354.367861db@rorschach.local.home
Reported-by: "Dmitry V. Levin" <ldv@strace.io>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _TRACE_MMAP_H_
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#define _TRACE_MMAP_H_
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#include <linux/types.h>
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/**
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* struct trace_buffer_meta - Ring-buffer Meta-page description
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* @meta_page_size: Size of this meta-page.
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* @meta_struct_len: Size of this structure.
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* @subbuf_size: Size of each sub-buffer.
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* @nr_subbufs: Number of subbfs in the ring-buffer, including the reader.
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* @reader.lost_events: Number of events lost at the time of the reader swap.
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* @reader.id: subbuf ID of the current reader. ID range [0 : @nr_subbufs - 1]
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* @reader.read: Number of bytes read on the reader subbuf.
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* @flags: Placeholder for now, 0 until new features are supported.
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* @entries: Number of entries in the ring-buffer.
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* @overrun: Number of entries lost in the ring-buffer.
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* @read: Number of entries that have been read.
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* @Reserved1: Internal use only.
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* @Reserved2: Internal use only.
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*/
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struct trace_buffer_meta {
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__u32 meta_page_size;
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__u32 meta_struct_len;
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__u32 subbuf_size;
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__u32 nr_subbufs;
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struct {
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__u64 lost_events;
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__u32 id;
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__u32 read;
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} reader;
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__u64 flags;
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__u64 entries;
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__u64 overrun;
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__u64 read;
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__u64 Reserved1;
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__u64 Reserved2;
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};
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#define TRACE_MMAP_IOCTL_GET_READER _IO('R', 0x20)
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#endif /* _TRACE_MMAP_H_ */
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