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

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message Nov 22, 2018 perf events

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Commit-ID:  1475d35c4a6174d4ec633b9af5713e9770b3ac0d
Gitweb:     https://git.kernel.org/tip/1475d35c4a6174d4ec633b9af5713e9770b3ac0d
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Tue, 6 Nov 2018 15:21:45 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Wed, 21 Nov 2018 12:00:30 -0300

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 <[email protected]>
Cc David Ahern <[email protected]>
Cc Jiri Olsa <[email protected]>
Cc Namhyung Kim <[email protected]>
Cc Wang Nan <[email protected]>
Link https://lkml.kernel.org/n/[email protected] open here
Signed-off-by Arnaldo Carvalho de Melo <[email protected]>
---
 tools/perf/include/bpf/unistd.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
tools/perf/include/bpf/unistd.h new file +10 -0
new file mode 100644
index 000000000000..ca7877f9a976
@@ -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();
+}