Yonghong Song 8482941f09 bpf: Add bpf_send_signal_thread() helper ... Commit 8b401f9ed2 ("bpf: implement bpf_send_signal() helper") added helper bpf_send_signal() which permits bpf program to send a signal to the current process. The signal may be delivered to any threads in the process. We found a use case where sending the signal to the current thread is more preferable. - A bpf program will collect the stack trace and then send signal to the user application. - The user application will add some thread specific information to the just collected stack trace for later analysis. If bpf_send_signal() is used, user application will need to check whether the thread receiving the signal matches the thread collecting the stack by checking thread id. If not, it will need to send signal to another thread through pthread_kill(). This patch proposed a new helper bpf_send_signal_thread(), which sends the signal to the thread corresponding to the current kernel task. This way, user space is guaranteed that bpf_program execution context and user space signal handling context are the same thread. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200115035002.602336-1-yhs@fb.com		2020-01-15 11:44:51 -08:00
..
asm	tools: Add missing stdio.h include to asm/bug.h header	2019-09-25 09:51:44 -03:00
asm-generic	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
linux	augmented rbtree: rework the RB_DECLARE_CALLBACKS macro definition	2019-09-25 17:51:39 -07:00
nolibc	tool headers nolibc: add RISCV support	2019-05-08 15:48:43 +02:00
tools	tools: bpf: fix license for a compat header file	2018-09-19 23:49:58 +02:00
trace/events	tools/lib/lockdep: Remove private kernel headers	2017-06-05 09:28:14 +02:00
uapi	bpf: Add bpf_send_signal_thread() helper	2020-01-15 11:44:51 -08:00