On 2025-09-24 16:20:58+0200, Benjamin Berg wrote:
From: Benjamin Berg benjamin.berg@intel.com
Add ptrace support, as it will be useful in UML.
Signed-off-by: Benjamin Berg benjamin.berg@intel.com
v3:
- Only use variardic for ptrace and not for sys_ptrace
tools/include/nolibc/Makefile | 1 + tools/include/nolibc/nolibc.h | 1 + tools/include/nolibc/sys/ptrace.h | 44 ++++++++++++++++++++ tools/testing/selftests/nolibc/nolibc-test.c | 2 + 4 files changed, 48 insertions(+) create mode 100644 tools/include/nolibc/sys/ptrace.h
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diff --git a/tools/include/nolibc/sys/ptrace.h b/tools/include/nolibc/sys/ptrace.h new file mode 100644 index 000000000000..5d1e52965878 --- /dev/null +++ b/tools/include/nolibc/sys/ptrace.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/*
- ptrace for NOLIBC
- Copyright (C) 2017-2021 Willy Tarreau w@1wt.eu
- Copyright (C) 2025 Intel Corporation
- */
+/* make sure to include all global symbols */ +#include "../nolibc.h"
+#ifndef _NOLIBC_SYS_PTRACE_H +#define _NOLIBC_SYS_PTRACE_H
+#include "../sys.h" +#include "uio.h"
+#include <linux/ptrace.h>
+/*
- long ptrace(int op, pid_t pid, void *addr, void *data);
- */
+static __attribute__((unused)) +long sys_ptrace(int op, pid_t pid, void *addr, void *data) +{
- return my_syscall4(__NR_ptrace, op, pid, addr, data);
+}
+static __attribute__((unused)) +ssize_t ptrace(int op, pid_t pid, ...) +{
- ssize_t ret;
- va_list args;
- va_start(args, pid);
- ret = __sysret(sys_ptrace(op, pid,
va_arg(args, void *),va_arg(args, void *)));- va_end(args);
My understanding of the last discussion was not to use varargs here either. Instead I wanted to stick to the prototype from the manpage.
- return ret;
+}
+#endif /* _NOLIBC_SYS_PTRACE_H */
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