linux-kernel - [PATCH 1/2] tools/nolibc: add pipe() support

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Date:   Tue, 25 Jul 2023 14:01:21 -0400
From:   Yuan Tan <tanyuan@...ylab.org>
To:     w@....eu
Cc:     falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Yuan Tan <tanyuan@...ylab.org>
Subject: [PATCH 1/2] tools/nolibc: add pipe() support

pipe is crucial for shell.

Signed-off-by: Yuan Tan <tanyuan@...ylab.org>
---
 tools/include/nolibc/sys.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 8bfe7db20b80..09841fc266fe 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -752,6 +752,23 @@ int open(const char *path, int flags, ...)
 }
 
 
+/*
+ * int pipe(int pipefd[2]);
+ */
+
+static __attribute__((unused))
+int sys_pipe(int pipefd[2])
+{
+	return my_syscall1(__NR_pipe, pipefd);
+}
+
+static __attribute__((unused))
+int pipe(int pipefd[2])
+{
+	return __sysret(sys_pipe(pipefd));
+}
+
+
 /*
  * int prctl(int option, unsigned long arg2, unsigned long arg3,
  *                       unsigned long arg4, unsigned long arg5);
-- 
2.39.2