__NR_pidfd_send_signal  858 arch/arm64/include/asm/unistd32.h #define __NR_pidfd_send_signal 424
__NR_pidfd_send_signal  827 include/uapi/asm-generic/unistd.h #define __NR_pidfd_send_signal 424
__NR_pidfd_send_signal   25 samples/pidfd/pidfd-metadata.c #define __NR_pidfd_send_signal -1
__NR_pidfd_send_signal  827 tools/include/uapi/asm-generic/unistd.h #define __NR_pidfd_send_signal 424
__NR_pidfd_send_signal   32 tools/testing/selftests/pidfd/pidfd.h #define __NR_pidfd_send_signal -1