Comment by manwe150
3 years ago
Runtime syscall number detection is very common in practice, since the kernel returns ENOSYS to enable that exact ability for glibc and other shim libraries
3 years ago
Runtime syscall number detection is very common in practice, since the kernel returns ENOSYS to enable that exact ability for glibc and other shim libraries
That's syscall for _availability_ detection, not its number. There's no way to ask the kernel "what's the number of the syscall commonly known as read()".