This is the correct answer. Don't use syscalls unless you know what you're doing, obviously. Take a look at how musl and glibc POSIX calls are implemented, some

This is the correct answer. Don't use syscalls unless you know what you're doing, obviously. Take a look at how musl and glibc POSIX calls are implemented, some have nuances you have to be aware of, and in others libc might do hidden stuff behind the curtain. Example of small nuance that can ruin your day/week: the size of syscall(2) arguments is fixed, but for some syscalls the arguments must be smaller. Hence you have to pack and aline the values properly in the registers. This example is from the syscall(2) manpage.