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authorDaniel T. Lee <danieltimlee@gmail.com>2020-03-21 19:04:23 +0900
committerDaniel Borkmann <daniel@iogearbox.net>2020-03-23 22:27:51 +0100
commit24a6034acc922f1f6292636be4ec4dc3d9b4d2d7 (patch)
tree727c570476d15c624e63c61ffac6deb56f71bf05 /tools/testing/selftests/bpf/trace_helpers.c
parentc9b24312040edaa89acb6fb91a9a53fb4775309e (diff)
samples, bpf: Move read_trace_pipe to trace_helpers
To reduce the reliance of trace samples (trace*_user) on bpf_load, move read_trace_pipe to trace_helpers. By moving this bpf_loader helper elsewhere, trace functions can be easily migrated to libbbpf. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200321100424.1593964-2-danieltimlee@gmail.com
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
-rw-r--r--tools/testing/selftests/bpf/trace_helpers.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 7f989b3e4e22..4d0e913bbb22 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -4,12 +4,15 @@
#include <string.h>
#include <assert.h>
#include <errno.h>
+#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <linux/perf_event.h>
#include <sys/mman.h>
#include "trace_helpers.h"
+#define DEBUGFS "/sys/kernel/debug/tracing/"
+
#define MAX_SYMS 300000
static struct ksym syms[MAX_SYMS];
static int sym_cnt;
@@ -86,3 +89,23 @@ long ksym_get_addr(const char *name)
return 0;
}
+
+void read_trace_pipe(void)
+{
+ int trace_fd;
+
+ trace_fd = open(DEBUGFS "trace_pipe", O_RDONLY, 0);
+ if (trace_fd < 0)
+ return;
+
+ while (1) {
+ static char buf[4096];
+ ssize_t sz;
+
+ sz = read(trace_fd, buf, sizeof(buf) - 1);
+ if (sz > 0) {
+ buf[sz] = 0;
+ puts(buf);
+ }
+ }
+}