recvmmsg

receive multiple messages on a socket

sys_recvmmsg(int fd, struct mmsghdr *mmsg, unsigned int vlen, unsigned int flags, struct __kernel_timespec *timeout)

register	value
`rax`	299, the syscall number
`rdi`	int fd
`rsi`	struct mmsghdr *mmsg
`rdx`	unsigned int vlen
`r10`	unsigned int flags
`r8`	struct __kernel_timespec *timeout
`rax`	the return value

Then run syscall to enter the kernel.

Same syscall on other architectures