From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Tue, 6 Nov 2018 18:21:45 +0000 (-0300)
Subject: perf bpf: Add unistd.h to the headers accessible to bpf proggies
X-Git-Tag: v5.4-rc1~1977^2~9^2~27
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1475d35c4a6174d4ec633b9af5713e9770b3ac0d;p=platform%2Fkernel%2Flinux-rpi.git

perf bpf: Add unistd.h to the headers accessible to bpf proggies

Start with a getpid() function wrapping BPF_FUNC_get_current_pid_tgid,
idea is to mimic the system headers.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-zo8hv22onidep7tm785dzxfk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/include/bpf/unistd.h b/tools/perf/include/bpf/unistd.h
new file mode 100644
index 0000000..ca7877f
--- /dev/null
+++ b/tools/perf/include/bpf/unistd.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: LGPL-2.1
+
+#include <bpf.h>
+
+static int (*bpf_get_current_pid_tgid)(void) = (void *)BPF_FUNC_get_current_pid_tgid;
+
+static pid_t getpid(void)
+{
+	return bpf_get_current_pid_tgid();
+}