[PATCH v2 1/2] man/man2/seccomp.2: Document SECCOMP_FILTER_FLAG_TSYNC_ESRCH

Document SECCOMP_FILTER_FLAG_TSYNC_ESRCH flag, which allows to
use SECCOMP_FILTER_FLAG_TSYNC and SECCOMP_FILTER_FLAG_NEW_LISTENER
flags together by returning ESRCH on synchronization error instead
of the thread ID.

<https://lore.kernel.org/r/[email protected]>

Signed-off-by: funsafemath <[email protected]>
---
 man/man2/seccomp.2 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/man/man2/seccomp.2 b/man/man2/seccomp.2
index 75c7b2d58..a2776aab7 100644
--- a/man/man2/seccomp.2
+++ b/man/man2/seccomp.2
@@ -241,6 +241,21 @@ .SH DESCRIPTION
 .B SECCOMP_MODE_STRICT
 or if it has attached new seccomp filters to itself,
 diverging from the calling thread's filter tree.
+.TP
+.BR SECCOMP_FILTER_FLAG_TSYNC_ESRCH " (since Linux 5.7)"
+.\" commit 51891498f2da78ee64dfad88fa53c9e85fb50abf
+Fail with
+.B ESRCH
+instead of returning the thread ID on synchronization failure if
+.B SECCOMP_FILTER_FLAG_TSYNC
+was specified.
+.IP
+If this flag is not set, using
+.B SECCOMP_FILTER_FLAG_NEW_LISTENER
+and
+.B SECCOMP_FILTER_FLAG_TSYNC
+flags together results in
+.BR EINVAL .
 .RE
 .TP
 .BR SECCOMP_GET_ACTION_AVAIL " (since Linux 4.14)"
-- 
2.52.0

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