linux-kernel - [PATCH 1/6] tools/nolibc: add support for waitid()

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Message-Id: <20241221-nolibc-rv32-v1-1-d9ef6dab7c63@weissschuh.net>
Date: Sat, 21 Dec 2024 15:44:28 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, Zhangjin Wu <falcon@...ylab.org>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/6] tools/nolibc: add support for waitid()

waitid() is the modern variant of the family of wait-like syscalls.
Some architectures have dropped support for wait(), wait4() and waitpid()
but all of them support waitid().
It is more flexible and easier to use than the older ones.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/include/nolibc/sys.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 7b82bc3cf107439a3f09f98b99d4d540ffb9ba2a..d4a5c2399a66b200ebf7ab249569cce2285481a5 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -23,6 +23,7 @@
 #include <linux/prctl.h>
 #include <linux/resource.h>
 #include <linux/utsname.h>
+#include <linux/signal.h>
 
 #include "arch.h"
 #include "errno.h"
@@ -1225,6 +1226,23 @@ pid_t waitpid(pid_t pid, int *status, int options)
 }
 
 
+/*
+ * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
+ */
+
+static __attribute__((unused))
+int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)
+{
+	return my_syscall5(__NR_waitid, which, pid, infop, options, rusage);
+}
+
+static __attribute__((unused))
+int waitid(int which, pid_t pid, siginfo_t *infop, int options)
+{
+	return __sysret(sys_waitid(which, pid, infop, options, NULL));
+}
+
+
 /*
  * ssize_t write(int fd, const void *buf, size_t count);
  */

-- 
2.47.1