linux/samples/bpf/tracex7_kern.c

#include <uapi/linux/ptrace.h>
#include <uapi/linux/bpf.h>
#include <linux/version.h>
#include <bpf/bpf_helpers.h>

SEC("kprobe/open_ctree")
int bpf_prog1(struct pt_regs *ctx)
{
	unsigned long rc = -12;

	bpf_override_return(ctx, rc);
	return 0;
}

char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;
samples/bpf: add a test for bpf_override_return This adds a basic test for bpf_override_return to verify it works. We override the main function for mounting a btrfs fs so it'll return -ENOMEM and then make sure that trying to mount a btrfs fs will fail. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 2017-12-12 00:36:49 +08:00			`#include <uapi/linux/ptrace.h>`
			`#include <uapi/linux/bpf.h>`
			`#include <linux/version.h>`
samples/bpf: Use consistent include paths for libbpf Fix all files in samples/bpf to include libbpf header files with the bpf/ prefix, to be consistent with external users of the library. Also ensure that all includes of exported libbpf header files (those that are exported on 'make install' of the library) use bracketed includes instead of quoted. To make sure no new files are introduced that doesn't include the bpf/ prefix in its include, remove tools/lib/bpf from the include path entirely, and use tools/lib instead. Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir") Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk 2020-01-20 21:06:49 +08:00			`#include <bpf/bpf_helpers.h>`
samples/bpf: add a test for bpf_override_return This adds a basic test for bpf_override_return to verify it works. We override the main function for mounting a btrfs fs so it'll return -ENOMEM and then make sure that trying to mount a btrfs fs will fail. Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> 2017-12-12 00:36:49 +08:00
			`SEC("kprobe/open_ctree")`
			`int bpf_prog1(struct pt_regs *ctx)`
			`{`
			`unsigned long rc = -12;`

			`bpf_override_return(ctx, rc);`
			`return 0;`
			`}`

			`char _license[] SEC("license") = "GPL";`
			`u32 _version SEC("version") = LINUX_VERSION_CODE;`