linux-kernel - [PATCH 3/3] clone.2: Use pid_t for clone3() {child,parent}

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Date:   Sat, 16 Nov 2019 12:41:14 +0100
From:   Christian Brauner <christian@...uner.io>
To:     mtk.manpages@...il.com
Cc:     adrian@...as.de, akpm@...ux-foundation.org, arnd@...db.de,
        avagin@...il.com, christian.brauner@...ntu.com,
        dhowells@...hat.com, fweimer@...hat.com, jannh@...gle.com,
        keescook@...omium.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-man@...r.kernel.org,
        mingo@...e.hu, oleg@...hat.com, xemul@...tuozzo.com
Subject: [PATCH 3/3] clone.2: Use pid_t for clone3() {child,parent}_tid

From: Christian Brauner <christian.brauner@...ntu.com>

Advertise to userspace that they should use proper pid_t types for
arguments returning a pid.
The kernel-internal struct kernel_clone_args currently uses int as type
and since POSIX mandates that pid_t is a signed integer type and glibc
and friends use int this is not an issue. After the merge window for
v5.5 closes we can switch struct kernel_clone_args over to using pid_t
as well without any danger in regressing current userspace.
Also note, that the new set tid feature which will be merged for v5.5
uses pid_t types as well.

Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
 man2/clone.2 | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/man2/clone.2 b/man2/clone.2
index faff2ada6..bf2d7c731 100644
--- a/man2/clone.2
+++ b/man2/clone.2
@@ -183,9 +183,9 @@ is a structure of the following form:
 struct clone_args {
     u64 flags;        /* Flags bit mask */
     u64 pidfd;        /* Where to store PID file descriptor
-                         (\fIint *\fP) */
+                         (\fIpid_t *\fP) */
     u64 child_tid;    /* Where to store child TID,
-                         in child's memory (\fIint *\fP) */
+                         in child's memory (\fIpid_t *\fP) */
     u64 parent_tid;   /* Where to store child TID,
                          in parent's memory (\fIint *\fP) */
     u64 exit_signal;  /* Signal to deliver to parent on
-- 
2.24.0