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1 # bcc Reference Guide
5 This guide is incomplete. If something feels missing, check the bcc and kernel source. And if you c…
58 - [bcc Python](#bcc-python)
99 This section describes the C part of a bcc program.
127 …com/iovisor/bcc/blob/4afa96a71c5dbfc4c507c3355e20baa6c184a3a8/examples/tracing/tcpv4connect.py#L28…
128 …/iovisor/bcc/commit/310ab53710cfd46095c1f6b3e44f1dbc8d1a41d8#diff-8cd1822359ffee26e7469f991ce0ef00…
152 …com/iovisor/bcc/blob/4afa96a71c5dbfc4c507c3355e20baa6c184a3a8/examples/tracing/tcpv4connect.py#L38…
177 ….com/iovisor/bcc/blob/a4159da8c4ea8a05a3c6e402451f530d6e5a8b41/examples/tracing/urandomread.py#L19…
178 [search /examples](https://github.com/iovisor/bcc/search?q=TRACEPOINT_PROBE+path%3Aexamples&type=Co…
179 [search /tools](https://github.com/iovisor/bcc/search?q=TRACEPOINT_PROBE+path%3Atools&type=Code)
201 [code](https://github.com/iovisor/bcc/blob/4afa96a71c5dbfc4c507c3355e20baa6c184a3a8/examples/tracin…
222 ….com/iovisor/bcc/blob/4afa96a71c5dbfc4c507c3355e20baa6c184a3a8/examples/tracing/strlen_hist.py#L39…
223 …/github.com/iovisor/bcc/blob/4afa96a71c5dbfc4c507c3355e20baa6c184a3a8/tools/bashreadline.py) ([out…
247 [code](https://github.com/iovisor/bcc/commit/4f88a9401357d7b75e917abd994aa6ea97dda4d3#diff-04a7cad5…
248 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_usdt_readarg+path%3Aexamples&type=Co…
249 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_usdt_readarg+path%3Atools&type=Code)
257 …tracepoint_args```, which is defined in [bpf.h](https://github.com/iovisor/bcc/blob/master/src/cc/…
278 [search /tools](https://github.com/iovisor/bcc/search?q=RAW_TRACEPOINT_PROBE+path%3Atools&type=Code)
288 …ns automatically in some cases, such as dereferencing kernel variables, as bcc will rewrite the BP…
291 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_probe_read+path%3Aexamples&type=Code…
292 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_probe_read+path%3Atools&type=Code)
305 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_probe_read_str+path%3Aexamples&type=…
306 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_probe_read_str+path%3Atools&type=Code)
315 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_ktime_get_ns+path%3Aexamples&type=Co…
316 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_ktime_get_ns+path%3Atools&type=Code)
327 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_get_current_pid_tgid+path%3Aexamples…
328 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_get_current_pid_tgid+path%3Atools&type=…
339 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_get_current_uid_gid+path%3Aexamples&…
340 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_get_current_uid_gid+path%3Atools&type=C…
360 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_get_current_comm+path%3Aexamples&typ…
361 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_get_current_comm+path%3Atools&type=Code)
383 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_get_current_task+path%3Aexamples&typ…
384 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_get_current_task+path%3Atools&type=Code)
393 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_log2l+path%3Aexamples&type=Code),
394 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_log2l+path%3Atools&type=Code)
403 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_get_prandom_u32+path%3Aexamples&type…
404 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_get_prandom_u32+path%3Atools&type=Code)
443 [search /examples](https://github.com/iovisor/bcc/search?q=bpf_trace_printk+path%3Aexamples&type=Co…
444 [search /tools](https://github.com/iovisor/bcc/search?q=bpf_trace_printk+path%3Atools&type=Code)
478 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_PERF_OUTPUT+path%3Aexamples&type=Cod…
479 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_PERF_OUTPUT+path%3Atools&type=Code)
490 [search /examples](https://github.com/iovisor/bcc/search?q=perf_submit+path%3Aexamples&type=Code),
491 [search /tools](https://github.com/iovisor/bcc/search?q=perf_submit+path%3Atools&type=Code)
506 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_TABLE+path%3Aexamples&type=Code),
507 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_TABLE+path%3Atools&type=Code)
528 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_HASH+path%3Aexamples&type=Code),
529 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_HASH+path%3Atools&type=Code)
550 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_ARRAY+path%3Aexamples&type=Code),
551 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_ARRAY+path%3Atools&type=Code)
572 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_HISTOGRAM+path%3Aexamples&type=Code),
573 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_HISTOGRAM+path%3Atools&type=Code)
592 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_STACK_TRACE+path%3Aexamples&type=Cod…
593 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_STACK_TRACE+path%3Atools&type=Code)
607 b = bcc.BPF(text=text, cflags=["-DNUM_CPUS=%d" % multiprocessing.cpu_count()])
616 [search /tests](https://github.com/iovisor/bcc/search?q=BPF_PERF_ARRAY+path%3Atests&type=Code)
638 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_PERCPU_ARRAY+path%3Aexamples&type=Co…
639 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_PERCPU_ARRAY+path%3Atools&type=Code)
660 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_LPM_TRIE+path%3Aexamples&type=Code),
661 [search /tools](https://github.com/iovisor/bcc/search?q=BPF_LPM_TRIE+path%3Atools&type=Code)
672 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_PROG_ARRAY+path%3Aexamples&type=Code…
673 [search /tests](https://github.com/iovisor/bcc/search?q=BPF_PROG_ARRAY+path%3Atests&type=Code),
674 [assign fd](https://github.com/iovisor/bcc/blob/master/examples/networking/tunnel_monitor/monitor.p…
690 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_DEVMAP+path%3Aexamples&type=Code),
706 [search /examples](https://github.com/iovisor/bcc/search?q=BPF_CPUMAP+path%3Aexamples&type=Code),
715 [search /examples](https://github.com/iovisor/bcc/search?q=lookup+path%3Aexamples&type=Code),
716 [search /tools](https://github.com/iovisor/bcc/search?q=lookup+path%3Atools&type=Code)
725 [search /examples](https://github.com/iovisor/bcc/search?q=lookup_or_init+path%3Aexamples&type=Code…
726 [search /tools](https://github.com/iovisor/bcc/search?q=lookup_or_init+path%3Atools&type=Code)
735 [search /examples](https://github.com/iovisor/bcc/search?q=delete+path%3Aexamples&type=Code),
736 [search /tools](https://github.com/iovisor/bcc/search?q=delete+path%3Atools&type=Code)
745 [search /examples](https://github.com/iovisor/bcc/search?q=update+path%3Aexamples&type=Code),
746 [search /tools](https://github.com/iovisor/bcc/search?q=update+path%3Atools&type=Code)
755 [search /examples](https://github.com/iovisor/bcc/search?q=insert+path%3Aexamples&type=Code)
764 [search /examples](https://github.com/iovisor/bcc/search?q=increment+path%3Aexamples&type=Code),
765 [search /tools](https://github.com/iovisor/bcc/search?q=increment+path%3Atools&type=Code)
774 [search /examples](https://github.com/iovisor/bcc/search?q=get_stackid+path%3Aexamples&type=Code),
775 [search /tools](https://github.com/iovisor/bcc/search?q=get_stackid+path%3Atools&type=Code)
784 [search /tests](https://github.com/iovisor/bcc/search?q=perf_read+path%3Atests&type=Code)
822 [search /examples](https://github.com/iovisor/bcc/search?l=C&q=call+path%3Aexamples&type=Code),
823 [search /tests](https://github.com/iovisor/bcc/search?l=C&q=call+path%3Atests&type=Code)
849 b = bcc.BPF(src_file="example.c")
861 [search /examples](https://github.com/iovisor/bcc/search?l=C&q=redirect_map+path%3Aexamples&type=Co…
885 # bcc Python
936 [search /examples](https://github.com/iovisor/bcc/search?q=BPF+path%3Aexamples+language%3Apython&ty…
937 [search /tools](https://github.com/iovisor/bcc/search?q=BPF+path%3Atools+language%3Apython&type=Cod…
960 [search /examples](https://github.com/iovisor/bcc/search?q=USDT+path%3Aexamples+language%3Apython&t…
961 [search /tools](https://github.com/iovisor/bcc/search?q=USDT+path%3Atools+language%3Apython&type=Co…
984 [search /examples](https://github.com/iovisor/bcc/search?q=attach_kprobe+path%3Aexamples+language%3…
985 [search /tools](https://github.com/iovisor/bcc/search?q=attach_kprobe+path%3Atools+language%3Apytho…
1006 [search /examples](https://github.com/iovisor/bcc/search?q=attach_kretprobe+path%3Aexamples+languag…
1007 [search /tools](https://github.com/iovisor/bcc/search?q=attach_kretprobe+path%3Atools+language%3Apy…
1046 [code](https://github.com/iovisor/bcc/blob/a4159da8c4ea8a05a3c6e402451f530d6e5a8b41/examples/tracin…
1076 [search /examples](https://github.com/iovisor/bcc/search?q=attach_uprobe+path%3Aexamples+language%3…
1077 [search /tools](https://github.com/iovisor/bcc/search?q=attach_uprobe+path%3Atools+language%3Apytho…
1105 [search /examples](https://github.com/iovisor/bcc/search?q=attach_uretprobe+path%3Aexamples+languag…
1106 [search /tools](https://github.com/iovisor/bcc/search?q=attach_uretprobe+path%3Atools+language%3Apy…
1125 [search /examples](https://github.com/iovisor/bcc/search?q=enable_probe+path%3Aexamples+language%3A…
1126 [search /tools](https://github.com/iovisor/bcc/search?q=enable_probe+path%3Atools+language%3Apython…
1143 [search /tools](https://github.com/iovisor/bcc/search?q=attach_raw_tracepoint+path%3Atools+language…
1168 [search /examples](https://github.com/iovisor/bcc/search?q=trace_print+path%3Aexamples+language%3Ap…
1169 [search /tools](https://github.com/iovisor/bcc/search?q=trace_print+path%3Atools+language%3Apython&…
1193 [search /examples](https://github.com/iovisor/bcc/search?q=trace_print+path%3Aexamples+language%3Ap…
1194 [search /tools](https://github.com/iovisor/bcc/search?q=trace_print+path%3Atools+language%3Apython&…
1219 [code](https://github.com/iovisor/bcc/blob/08fbceb7e828f0e3e77688497727c5b2405905fd/examples/tracin…
1220 [search /examples](https://github.com/iovisor/bcc/search?q=perf_buffer_poll+path%3Aexamples+languag…
1221 [search /tools](https://github.com/iovisor/bcc/search?q=perf_buffer_poll+path%3Atools+language%3Apy…
1225 Maps are BPF data stores, and are used in bcc to implement a table, and then higher level objects o…
1283 Perhaps in a future bcc version, the Python data structure will be automatically generated from the…
1286 [code](https://github.com/iovisor/bcc/blob/08fbceb7e828f0e3e77688497727c5b2405905fd/examples/tracin…
1287 [search /examples](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Aexamples+languag…
1288 [search /tools](https://github.com/iovisor/bcc/search?q=open_perf_buffer+path%3Atools+language%3Apy…
1309 [search /examples](https://github.com/iovisor/bcc/search?q=clear+items%3Aexamples+language%3Apython…
1310 [search /tools](https://github.com/iovisor/bcc/search?q=clear+items%3Atools+language%3Apython&type=…
1336 [search /examples](https://github.com/iovisor/bcc/search?q=clear+path%3Aexamples+language%3Apython&…
1337 [search /tools](https://github.com/iovisor/bcc/search?q=clear+path%3Atools+language%3Apython&type=C…
1387 [search /examples](https://github.com/iovisor/bcc/search?q=print_log2_hist+path%3Aexamples+language…
1388 [search /tools](https://github.com/iovisor/bcc/search?q=print_log2_hist+path%3Atools+language%3Apyt…
1446 [search /examples](https://github.com/iovisor/bcc/search?q=print_linear_hist+path%3Aexamples+langua…
1447 [search /tools](https://github.com/iovisor/bcc/search?q=print_linear_hist+path%3Atools+language%3Ap…
1451 Some helper methods provided by bcc. Note that since we're in Python, we can import any Python libr…
1466 [search /examples](https://github.com/iovisor/bcc/search?q=ksym+path%3Aexamples+language%3Apython&t…
1467 [search /tools](https://github.com/iovisor/bcc/search?q=ksym+path%3Atools+language%3Apython&type=Co…
1482 [search /examples](https://github.com/iovisor/bcc/search?q=ksymname+path%3Aexamples+language%3Apyth…
1483 [search /tools](https://github.com/iovisor/bcc/search?q=ksymname+path%3Atools+language%3Apython&typ…
1498 [search /examples](https://github.com/iovisor/bcc/search?q=sym+path%3Aexamples+language%3Apython&ty…
1499 [search /tools](https://github.com/iovisor/bcc/search?q=sym+path%3Atools+language%3Apython&type=Cod…
1518 [search /examples](https://github.com/iovisor/bcc/search?q=num_open_kprobes+path%3Aexamples+languag…
1519 [search /tools](https://github.com/iovisor/bcc/search?q=num_open_kprobes+path%3Atools+language%3Apy…
1527 …be_read() to copy memory into the BPF stack, which can be automatic by the bcc rewriter in some ca…
1544   File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 172, in __init__
1546   File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 612, in _trace_autoload
1548   File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 212, in load_func
1555 …L-compatible license. Check which [BPF helpers](https://github.com/iovisor/bcc/blob/master/docs/ke…