Re:OS X BSD System Calls Reference
by asveikau on Wednesday July 08, 2015 @12:13AM
(#9849777)
Because when you remove items from that list or otherwise change the order, you break binary compatibility.
The C library specifies the index into this table when making a syscall. You don't want a situation where the C library and the kernel are mismatched and disagree about what the syscalls are.
The safe way to remove a syscall is to change it to return ENOSYS. All the syscalls that come after it in the table therefore retain the same index.
The C library specifies the index into this table when making a syscall. You don't want a situation where the C library and the kernel are mismatched and disagree about what the syscalls are.
The safe way to remove a syscall is to change it to return ENOSYS. All the syscalls that come after it in the table therefore retain the same index.