[PATCH] ptrace.2: document PTRACE_GET_SYSCALL_INFO

["Dmitry V. Levin" <ldv@altlinux.org>]

PTRACE_GET_SYSCALL_INFO request was introduced by Linux kernel commit
201766a20e30f982ccfe36bebfad9602c3ff574a aka v5.3-rc1~65^2~23.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
---
 man2/ptrace.2 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/man2/ptrace.2 b/man2/ptrace.2
index 8b8daf238..3b774f87b 100644
--- a/man2/ptrace.2
+++ b/man2/ptrace.2
@@ -1005,6 +1005,27 @@ of the
 .IR "struct user_desc"
 is ignored; in other words,
 this ptrace operation can't be used to allocate a free TLS entry.)
+.TP
+.BR PTRACE_GET_SYSCALL_INFO " (since Linux 5.3)"
+.\" commit 201766a20e30f982ccfe36bebfad9602c3ff574a
+Retrieve information about the syscall that caused the stop.
+The information is placed into the buffer pointed by
+.I data
+argument, which should be a pointer to a buffer of type
+.IR "struct ptrace_syscall_info" .
+The
+.I addr
+argument contains the size of the buffer pointed to
+by
+.I data
+argument (i.e.,
+.IR "sizeof(struct ptrace_syscall_info)" ).
+The return value contains the number of bytes available
+to be written by the kernel.
+If the size of data to be written by the kernel exceeds the size
+specified by
+.I addr
+argument, the output is truncated.
 .\"
 .SS Death under ptrace
 When a (possibly multithreaded) process receives a killing signal

-- 
ldv