Close fd and unshare when public map is destructed

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

stack walking scripts

fix pep8 lint errors in the rest of the tools

no functional changes
Signed-off-by: Alexei Starovoitov <ast@fb.com>

fix pep8 lint errors in biolatency and biosnoop

Signed-off-by: Alexei Starovoitov <ast@fb.com>

Add ability to export maps, enables cross-program sharing

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Allow a program to export a map for other programs to use. This enables
cross-program map sharing.

parent program syntax:
BPF_TABLE("array", int, int, shared, 10);
BPF_TABLE_EXPORT(shared);

child program syntax:
BPF_TABLE("extern", int, int, shared, 10);
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add ability to set custom cflags when loading programs

Example:
b = bcc.BPF("myprog.c", cflags=["-DMYCUSTOMFLAG1", ...])
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Remove runtime dependency on gcc stdarg headers and make

Remove the runtime dependency on gcc's stdarg.h. Do this by packaging
the (non-GPL) version shipped with clang. This allows the bulk of
kbuild_helper to be removed, at the expense of hardcoding the kernel
include paths. If in the future the kernel make system changes again to
require different -I paths, we'll have to think this through again.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

add new Arch packages, new TOC and spiffy up the formatting

Drop broken p4/docs symlink and create README.md+URL

There was a symlink to a local file, which would instead work better as
a URL to the bpf-docs repository.

Fixes: #304
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Improve json type support for misc struct/union types

The ability of the clang rewriter to extract the type information for
some types of structs, unions, and pointers to the aforementioned was
somewhat buggy. This became exposed in a test_clang case after a user
upgraded to a newer kernel, wherein the struct definition changed. The
functionality in question is only used to pass json-ified representation
of the struct to python in order to program the Key/Leaf metaclass.

Improve support for this and other types, including unions.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

make sure LDFLAGS are propagated as well

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Fix breakage from LLVM 3.8 API change

There is some difference in how to take a pointer from an iterator. This
code should work for both 3.7 and 3.8 APIs.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

p4: fixed bugs in control-flow generation

Honor the external C/CXX FLAGS

Signed-off-by: Gary Lin <glin@suse.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Automatically bump memlock ulimit

Instead of requiring the user to bump the ulimit in their shell before
starting a bcc script, try to setrlimit automatically when a failure
occurs. Since there is no getrusage for memlock limit, unfortunately we
have to brute force setting the limit. For now, just try bpf() once and
then try to set unlimited ulimit, then try bpf() again.

Fixes: #281
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Fixup dependencies of bcc-tools package

This should depend on python-bcc, which itself depends on libbcc.

Fixes: #291
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add bcc-tools package

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Ticket: #291
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Fixup broken symlink tests/cc/simulation.py

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>